View CXA3810M_7306829.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

- 1 - e10629 sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illu strating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. CXA3810M ac-dc controller description the CXA3810M has optimum configuration to realize va rious power supply circuits easily and compactly by including power-factor correction, resonant controller and various protection function in one package. (applications: power supply circuit, etc.) features ? power-factor correction ? critical conduction mode pfc control ? supports w/w input ? start timer ? maximum frequency limit (during overcurrent detection) ? continuous overcurrent detection protection function ? resonant controller ? timer-latch over current protection ? soft start function ? adjustment minimum frequency limit ? pulse over current load detection ? common ? adjacent 2-pin short protection ? various protection functions including overvoltage and overcurrent ? ac off detection ? pfc-ok signal output structure bicmos silicon monolithic ic package 24-pin sop free datasheet http:///
CXA3810M - 2 - absolute maximum ratings *1 allowable power dissipation reduction characteristics recommended operating conditions item symbol rating unit remarks maximum supply voltage vcc 24.0 v vcc pin voltage which operates with vcc as power supply vccin ?0.3 to vcc + 0.3 v ac_detin, ac_detout, ac_vrms, b_ok, mode1, mode2 driver output pin voltage vout ?0.3 to vcc + 0.3 v pfc_out, rm_outp, rm_outn power supply pin voltage for internal circuit vref ?0.3 to +7.0 v vref pin voltage which operates with vref as power supply vrefin ?0.3 to +7.0 v pfc_ovp, pfc_cs, pfc_vao, pfc_tonmax, pfc_vsense, rm_offadj, rm_rt, rm_ss, rm_cs1, rm_cs2, rm_fmin zcd current izcd ? 7mapfc_zcd allowable power dissipation p d *1 mw (see the thermal derating curve.) operating ambient temperature range topt ?30 to +125 ? c junction temperature tjmax +150 ? c storage temperature tstg ?55 to +150 ? c :?:?:?:?:? :?:?:?:?:? allowable power dissipation [mw] 1000 200 400 600 800 0 ?20 20 40 80 60 100 120 140 operating ambient temperature ta [?c] glass fabric base epoxy board 76mm 114mm t = 1.6mm 160 9jgpoqwpvgfqpcukpingnc[gtdqctf 9jgpoqwpvgfqpchqwtnc[gtdqctf 125?c 88.5?c 49.2?c item symbol rating unit remarks supply voltage (vcc system) vcc 12.0 to 18.0 v operating ambient temperature range topt ?25 to +85 ? c junction temperature tj ?25 to +125 ? c free datasheet http:///
CXA3810M - 3 - block diagram 3 19 22 17 20 2 24 11 4 10 6 5 8 9 7 16 13 12 15 14 1 23 21 ac_detout ac_detin ac_vrms mode1 mode2 rm_offadj pfc_tonmax pfc_cs pfc_zcd pfc_ovp pfc_vsense pfc_vao rm_rt rm_ss rm_fmin rm_cs1 rm_cs2 vref b_ok pfc_out rm_outp rm_outn vcc vcc vcc vcc vcc vcc vref vcc pfc on/off external latch rm_stop b_ok rm_ss_ok x x y ac_vrms 1m 50k 50k tsd pfc_en rm_en ng latch vbgr 4.0v pfc_vsense pfc_out pfc_ocp zcd_comp 1 voltage_amp ac_vrms ac_vrms v_ocp 0.1a 2.5v v_dpl 1.85v/1.65v uvlo/tsd ac input detector common control on-time control x 2 . y 1/x mode detector vcc vcc gnd 1.5v/1.3v dynamic power limit control rm osc rm control ss cnt fmin cnt rm_cs det db 300ns 18 en free datasheet http:///
CXA3810M - 4 - pin configuration pfc_out mode1 ac_detin top view 1 2 3 4 6 8 10 5 7 9 22 21 20 19 17 15 13 18 16 14 ac_vrms pfc_zcd pfc_cs pfc_vao pfc_vsense pfc_ovp pfc_tonmax rm_outp mode2 ac_detout rm_outn b_ok vcc gnd vref rm_rt rm_cs1 12 11 24 23 rm_offadj rm_fmin rm_cs2 rm_ss free datasheet http:///
CXA3810M - 5 - pin table pin no. symbol description connection end of protection diode 1 pfc_out pfc mosfet gate driver output - 2mode1 mode determination pin1 (active stby when mode1 = low, mode2 = high) vcc, gnd 3 ac_detin ac voltage sense input vcc, gnd 4 ac_vrms ac peak voltage sense and pfc enable vcc, gnd 5 pfc_zcd pfc zero current detect input vcc, gnd 6 pfc_cs pfc current sense input vref, gnd 7 pfc_vao pfc voltage control error amplifier output vref, gnd 8 pfc_vsense pfc output vo ltage sense input vref, gnd 9 pfc_ovp pfc output overvoltage sense input vref, gnd 10 pfc_tonmax pfc maximum on time control vref, gnd 11 rm_offadj resonant controller stop voltage adjustment and abnormal latch input vref, gnd 12 rm_fmin resonant controller minimum frequency setting vref, gnd 13 rm_ss resonant controller soft start and overcurrent timer-latch setting vref, gnd 14 rm_cs2 resonant controller overcurrent sense input (continuous overcurrent) vref 15 rm_cs1 resonant controller overcurrent sense input (pulse by pulse overcurrent) vref 16 rm_rt resonant controller frequency control vref, gnd 17 vref internal supply voltage vcc, gnd 18 gnd gnd ? 19 vcc power supply input gnd 20 b_ok pfc-ok signal output ? 21 rm_outn resonant controller low-side mosfet driver output ? 22 ac_detout ac off detect signal output ? 23 rm_outp resonant controller high- side mosfet driver output ? 24 mode2 mode determination pin2 (seq mode when mode1 = low, mode2 = low) vcc, gnd free datasheet http:///
CXA3810M - 6 - pin description pin no. symbol i/o standard pin voltage equivalent circuit description 1 pfc_out o vcc to gnd pfc mosfet gate driver output (connect to the nmos gate for pfc) 2 24 mode1 mode2 ii vcc to gnd mode select input (gnd connection: normal sequence vcc connection: standby mode) 3 ac_detin i vcc to gnd ac voltage input (connect to ac input detection resistor) 4ac_vrms i/o (vcc ? 2.0v) to gnd ac peak voltage sense and pfc enable (connect to peak voltage hold capacitor) 5 pfc_zcd i 4.4v to 0.6v pfc zero current detect input (connect to boost inductor of auxiliary winding) 1 nch pch nch pch vref vcc gnd 2 24 vcc gnd nch nch 3 vcc pch gnd pch nch pch pch vref 4 vcc gnd nch pch pch 5 vcc gnd pch vref pch nch free datasheet http:///
CXA3810M - 7 - 6 pfc_cs i vref to gnd pfc current sense input (connect to the detection side of current sense resistor) 7 pfc_vao o 3.2v to gnd pfc voltage control error amplifier output (connect a phase compensation circuit: between pfc_vao and gnd) 8 pfc_ vsense i vref to gnd during steadystate: 2.5v pfc output voltage sense input (connect to pfc output detection resistor) 9pfc_ovp i vref to gnd during steadystate: 2.5v pfc output overvoltage sense input (connect to pfc output detection resistor) 10 pfc_ tonmax i/o 3.2v to gnd pfc maximum on time control (connect to on time control capacitor) pin no. symbol i/o standard pin voltage equivalent circuit description 6 vref gnd pch 7 vref gnd pch nch nch pch pch 8 vref gnd pch pch 9 gnd pch nch pch vref pch 10 gnd pch pch vref nch free datasheet http:///
CXA3810M - 8 - 11 rm_offadj i vref to gnd resonant controller stop voltage adjustment and abnormal latch input 12 rm_fmin i 1.2v resonant controller minimum frequency setting (connect to minimum frequency control resistor) 13 rm_ss i/o vref to gnd during steadystate: 2.5v resonant controller soft start and overcurrent timer-latch setting (connect to the capacitor for soft start) 14 rm_cs2 i i vref to ?0.3v resonant controller overcurrent sense input (connect to the resistor for current detection) 15 rm_cs1 i vref to ?0.3v resonant controller overcurrent sense input (connect to the resistor for current detection) pin no. symbol i/o standard pin voltage equivalent circuit description 11 vref gnd pch 12 vref gnd pch nch nch 13 vref gnd pch pch nch 14 vref gnd pch 15 vref gnd pch pch free datasheet http:///
CXA3810M - 9 - 16 rm_rt i (3.5v) resonant controller frequency control (connect to the photo coupler for output feedback) 17 vref o 5.0v internal supply voltage output (connect to the capacitor for stabilization) 18 gnd ? ? ? gnd 19 vcc ? ? ? power supply input 20 b_ok o vcc to gnd pfc-ok signal output 22 ac_detout o ac off detect signal output 21 rm_outn o vcc to gnd resonant controller low- side mosfet driver output (connect to the drive transformer) 23 rm_outp o resonant controller high- side mosfet driver output (connect to the drive transformer) pin no. symbol i/o standard pin voltage equivalent circuit description pch pch pch pch 16 vref gnd nch 17 vcc gnd pch nch nch 20 22 nch pch nch pch vref vcc gnd vcc gnd pch nch 21 23 free datasheet http:///
CXA3810M - 10 - electrical characteristics ? shared blocks (unless otherwise specified, the conditions are ta = 27[ ? c], vcc = 12[v], mode1 = gnd, mode2 = gnd) 1. current consumption (vcc and pvcc pins) 2. under voltage lock out circuit block (vcc pin) 3. reference voltage output circuit block (vref pin) 4. ac input detection circ uit block (ac_detin pin) item symbol measurement conditions min. typ. max. unit current consumption in standby mode istb mode = vcc ? 700 1000 ? a current consumption in operation mode iact ac_detin = 1.0v, pfc_vsense = 1.0v * non switching ?3.03.5ma item symbol measurement conditions min. typ. max. unit turn-on voltage vact 10.2 11.0 11.8 v turn-off voltage voff 9.0 9.6 10.2 v hysteresis vact-voff vact ? voff 1.1 1.4 1.7 v item symbol measurement conditions min. typ. max. unit output voltage vvref 4.85 5.00 5.15 v input stability vline vcc = 10.5v to 18v ? 10 30 mv load stability vload iload = 0.1ma to 5ma ? 20 50 mv pin voltage when ng latch (when tsd) vvrefng iout = 10ma (design guarantee) ?0.10.5v item symbol measurement conditions min. typ. max. unit pfc operation start and stop voltage vpfcon ac_detin peak voltage (rise) 1.80 1.85 1.90 v vpfcoff ac_detin peak voltage (fall) 1.60 1.65 1.70 v hysteresis vpfchys vpfcon ? vpfcoff 0.17 0.20 0.23 v ac detection reference voltage high 1 vthach1 ac_vrms = 7.5v 4.675 4.875 5.075 v ac detection reference voltage high 2 vthach2 ac_vrms = 2.0v 1.1 1.3 1.5 v ac off detection delay time tdlyacoff ac_detin < ac_vrms ? 65% (state b) 6.489.6ms ac recovery detection delay time tdlyacon ac_detin > ac_vrms ? 65% (state c) 81012ms free datasheet http:///
CXA3810M - 11 - 5. ac off detect signal output circuit block (ac_detout pin) 6. mode pin voltage detection circuit block (mode1, mode2 pin) 7. clock timer item symbol measurement conditions min. typ. max. unit output low voltage vacoutl vcc = 18v, iout = 10ma ? 0.5 1.0 v output high voltage vacouth vcc = 18v, iout = ?10ma 17.0 17.5 ? v item symbol measurement conditions min. typ. max. unit mode detection voltage low vmodel 5.2 ? 5.6 v mode detection voltage high vmodeh 7.6 ? 8.4 v internal pull-up resistor value rmode mode = 0.1v 35 50 65 k ? item symbol measurement conditions min. typ. max. unit 1ms clock tclock 972 1024 1075 ? s free datasheet http:///
CXA3810M - 12 - ? pfc block (unless otherwise specified, the conditions are ta = 27[ ? c], vcc = 12[v], mode1 = gnd, mode2 = gnd) 8. pfc output circuit block (pfc_out pin) *1 rise time and fall time use vcc ? 0.1 to vcc ? 0.9 as the judgment voltages. 9. pfc-ok signal circuit block (b_ok pin) 10. ac peak voltage sense circuit block (ac_vrms pin) 11. pfc overcurrent detecti on circuit block (pfc_cs pin) item symbol measurement conditions min. typ. max. unit output low voltage vpoutl vcc = 18v, iout = 10ma ? 0.03 0.1 v output high voltage vpouth vcc = 18v, iout = ?10ma 17.85 17.9 ? v rise time *1 tpoutr vcc = 18v, c load = 1000pf ? 35 100 ns fall time *1 tpoutf vcc = 18v, c load = 1000pf ? 25 100 ns item symbol measurement conditions min. typ. max. unit output low voltage vacoutl vcc = 18v, iout = 10ma ? 0.5 1.0 v output high voltage vacouth vcc = 18v, iout = ?10ma 17.0 17.5 ? v item symbol measurement conditions min. typ. max. unit internal pull-down resistor value rvrms ac_vrms = 1.0v 0.8 1.0 1.2 m ? ac off discharge resistor value rvrmsdchg ac_vrms = 7.0v 104 130 156 k ? sag recovery operation switching voltage vthsag 4.950 5.100 5.250 v item symbol measurement conditions min. typ. max. unit overcurrent detection voltage1 vthcs1 ac_vrms = 1.65v 0.365 0.400 0.435 v overcurrent detection voltage2 vthcs2 ac_vrms = 2.55v 0.365 0.400 0.435 v power limit detection voltage1 vthdpl1 ac_vrms = 2.55v 0.439 0.488 0.537 v power limit detection voltage2 vthdpl1 ac_vrms = 6.0v 0.216 0.240 0.264 v blanking time tleb pfc_cs = 1.0v 200 250 300 ns delay time tcsdly cs to drv pfc_cs = 0v ? 1v (rectangular waveform input) 100 150 200 ns free datasheet http:///
CXA3810M - 13 - 12. pfc zero current detection circuit block (pfc_zcd pin) 13. error amplifier output circuit block for pfc voltage control (pfc_vao pin) item symbol measurement conditions min. typ. max. unit input threshold voltage vthzcd 1.2 1.3 1.4 v hysteresis vzcdhys 180 200 220 mv clamp high voltage vclph i = 3ma 4.0 4.4 5.0 v clamp low voltage vclpl i = ?3ma 0.3 0.6 1.0 v restart timer delay tstart 180 200 220 ? s minimum off time (during overcurrent detection) toffmin pfc_cs = 1.0v 3.32 4.00 4.73 ? s blanking time tteb (design guarantee) (384) (480) (576) ns item symbol measurement conditions min. typ. max. unit trans-conductance vvaogm (design guarantee) ? (90) ? ? a/v output high clamp voltage vvaoh pfc_vsense = 2.0v 3.1 3.3 3.5 v power limit clamp voltage ratio1 vvao1 pfc_vsense = 2.0v voltage ratio to internal reference voltage (typ.3.0v) to determine pfc max. on time 85 90 95 % power limit clamp voltage ratio2 vvao2 pfc_vsense = 2.0v voltage ratio to internal reference voltage (typ.3.0v) to determine pfc max. on time 75 80 85 % power limit clamp voltage ratio3 vvao3 pfc_vsense = 2.0v voltage ratio to internal reference voltage (typ.3.0v) to determine pfc max. on time 65 70 75 % power limit clamp voltage ratio4 vvao4 pfc_vsense = 2.0v voltage ratio to internal reference voltage (typ.3.0v) to determine pfc max. on time 55 60 65 % power limit clamp voltage ratio5 vvao5 pfc_vsense = 2.0v voltage ratio to internal reference voltage (typ.3.0v) to determine pfc max. on time 45 50 55 % power limit clamp voltage ratio6 vvao6 pfc_vsense = 2.0v voltage ratio to internal reference voltage (typ.3.0v) to determine pfc max. on time 35 40 45 % source current ivaosc pfc_vsense = 2.2v, pfc_vao = 0.5v 10 20 40 ? a output low voltage vvaol pfc_vsense = 2.55v 0 ? 0.2 v sink current ivaosk pfc_vsense = 2.65v, pfc_vao = 3.0v 51525 ? a free datasheet http:///
CXA3810M - 14 - 14. pfc maximum on time contro l circuit block (pfc_tonmax pin) 15. pfc output voltage detection circuit block (pfc_vsense pin) 16. resonant controller stop voltage adjustment circuit block (rm_offadj pin) item symbol measurement conditions min. typ. max. unit discharge time tdischg ct = 470pf pfc_tonmax = 3.3v to 0.1v ??150ns pfc output on time1 ton1 pfc_vsense = 2.0v, ac_vrms = 2.5v ct = 470pf 25.74 27.68 29.62 ? s pfc output on time2 ton2 pfc_vsense = 2.0v, ac_vrms = 5.0v ct = 470pf 6.38 7.09 7.80 ? s item symbol measurement conditions min. typ. max. unit pfc stop voltage vovp2 2.659 2.7 2.742 v pfc stop cancel voltage vovp2hys 2.548 2.6 2.652 v pfc control voltage vpfccnt 2.475 2.5 2.525 v pfc non-operating detection voltage and b_ok high level threshold vpfcnonact 2.280 2.4 2.520 v b_ok low level threshold vpfcbokl 2.254 2.3 2.346 v resonant controller operation start voltage vrmstart 2.100 2.143 2.186 v resonant controller operation stop voltage vrmstop rm_offadj = 1.883v 1.789 1.883 1.977 v pfc stop voltage during active standby vasovp 1.654 1.688 1.722 v pfc stop cancel voltage during active standby vasovphys 1.523 1.554 1.585 v resonant operation voltage during active standby vasrmen 1.390 1.419 1.448 v pin short-circuit detection vshort 0.2 0.3 0.4 v pull-up current ivs pfc_vsense = 0.1v 0.05 0.1 0.2 ? a item symbol measurement conditions min. typ. max. unit latch voltage for external error detection voffadjng 3.8 4.0 4.2 v free datasheet http:///
CXA3810M - 15 - 17. pfc overvoltage detecti on circuit block (pfc_ovp pin) item symbol measurement conditions min. typ. max. unit pfc overvoltage detection voltage vovp11 2.857 2.922 2.981 v pull-up current iovp pfc_vsense = 0.1v 0.05 0.1 0.2 ? a free datasheet http:///
CXA3810M - 16 - ? resonant controller block (unless otherwise specified, the conditions are ta = 27[ ? c], vcc = 12[v], mode1, 2 = gnd, rm_rt = open, rfmin = 120k ? ) 18. resonant controller output circuit block (rm_outp, rm_outn pins) *1 rise time and fall time use vcc ? 0.1 to vcc ? 0.9 as the judgment voltages. 19. resonant controller soft start circuit block (rm_ss pin) 20. resonant controller frequency control circuit block (rm_rt pin) 21. resonant controller minimum frequency adjustment circuit block (rm_fmin pin) item symbol measurement conditions min. typ. max. unit output low voltage vroutl vcc = 18v, iout = 10ma ? 0.05 0.1 v output high voltage vrouth vcc = 18v, iout = ?10ma 17.9 17.95 ? v rise time *1 vroutr vcc = 18v, c load = 1000pf ? 35 100 ns fall time *1 vroutf vcc = 18v, c load = 1000pf ? 35 100 ns item symbol measurement conditions min. typ. max. unit soft start current1 irmss1 rm_ss = 0v 7.5 10 12.5 ? a soft start current2 irmss2 rm_ss = 0v,active stby (mode1 = gnd, mode2 = vcc) 4.69 6.25 7.81 ? a clamp voltage vrmss 2.3 2.5 2.7 v overcurrent timer latch detection voltage vtimerlatch 3.8 4.0 4.2 v charging current during overcurrent detection iocc rm_cs = 0.3v, ss = 3.0v 3.2 5.0 6.8 ? a item symbol measurement conditions min. typ. max. unit maximum oscillation frequency frmmax irt = 2ma, rfmin = 39k ? 800 ? ? khz deadband width tdb 270 300 330 ns multiple number of clamp frequency when soft star fclamp f0/f4 (f0:rm_ss = 0v, f4:rm_ss = open) rfmin = 390k ? 3.5 4.0 4.5 times item symbol measurement conditions min. typ. max. unit setting frequency 1 fmin1 rfmin = 390k ? ?3% 46.1 +3% khz setting frequency 2 fmin2 rfmin = 120k ? ?4% 96.7 +4% khz setting frequency 3 fmin3 rfmin = 39k ? ?5% 144.1 +5% khz low current detection threshold ifminlow 0.85 1.25 1.65 ? a free datasheet http:///
CXA3810M - 17 - 22. resonant controller current detection circuit block (rm_cs1 pin) 23. resonant controller current detection circuit block (rm_cs2 pin) note) the shipping inspection is performed at room te mperature. (the design is guaranteed with respect to temperature fluctuation.) item symbol measurement conditions min. typ. max. unit positive side detection vcs1p when rm_outp = high 0.209 0.220 0.231 v negative side detection vcs1n when rm_outn = high ?0.295 ?0.260 ?0.235 v detection delay time tcsdly cs to drv rm_cs = ?0.3v ? 0.3v (rectangular input) 100 150 200 ns detection mask time tcsmask rm_cs = 0.3v 384 480 576 ns overcurrent detection voltage ratio when +b falls rrmocp vsense < 2.143v 10 15 20 % rm_cs1 pin offset current ics1ofs rm_cs1 = 0.1v 6.6 9.5 12.5 ? a item symbol measurement conditions min. typ. max. unit continuous load detection voltage vcs2 when rm_outp = high 0.158 0.175 0.193 v detection mask time tcsmask (rm_cs = 0.3v) (384) (480) (576) ns continuous load detection time tcs2 (when the time corresponds to 2.1s ? 5 times) (10) s rm_cs2 pin offset current ics2ofs rm_cs2 = 0.1v ?1.0 0 1.0 ? a free datasheet http:///
CXA3810M - 18 - 24. list of electrical characteristics item specification ratings (ta = 27 ? c) design guarantee ratings (ta = ?25 to +85 ? c) ( *1 ) unit min. typ. max. min. typ. max. current consumption (vcc, pvcc pins) current consumption in standby mode ? 700 1000 ? 700 1000 ? a current consumption in operation mode ? 3.0 3.5 ? 3.0 3.5 ma low voltage misoperation prevention circuit block (vcc pin) operation start voltage 10.2 11.0 11.8 10.2 11.0 11.8 v operation stop voltage 9.0 9.6 10.2 9.0 9.6 10.2 v hysteresis width 1.1 1.4 1.7 1.1 1.4 1.7 v reference voltage output block (vref pin) output voltage 4.85 5.00 5.15 4.85 5.00 5.15 v input stability ? 10 30 0 10 30.5( *2 )mv load stability ? 20 50 ? 20 50 mv pin voltage when ng latch (when tsd) ? 0.1 0.5 ? 0.1 0.5 v ac input detection circuit block (ac_detin pin) pfc operation start voltage 1.80 1.85 1.90 1.80 1.85 1.90 v 1.60 1.65 1.70 1.60 1.65 1.70 v hysteresis width 0.17 0.2 0.23 0.17 0.2 0.23 v ac detection reference voltage high 1 4.675 4.875 5.075 4.675 4.875 5.075 v ac detection reference voltage high 2 1.1 1.3 1.5 1.1 1.3 1.5 v ac off detection delay time 6.4 8 9.6 6.4 8 9.6 ms ac recovery detection delay time 8 10 12 8 10 12 ms ac input error detection output circuit block (ac_detout pin) output low voltage ? 0.5 1 ? 0.5 1 v output high voltage 17 17.5 ? 17 17.5 ? v mode pin determination circuit block (mode1, mode2 pin) mode detection voltage low 5.2 ? 5.6 5.2 ? 5.6 v mode detection voltage high 7.6 ? 8.4 7.6 ? 8.4 v internal pull-up resistor value 35 50 65 35 50 65 k ? clock timer 1ms clock 972 1024 1075 972 1024 1075 ? s pfc output circuit block (pfc_out pin) output low voltage ? 0.03 0.1 ? 0.03 0.1 v output high voltage 17.85 17.9 ? 17.85 17.9 ? v rise time ? 35 100 ? 35 100 ns fall time ? 25 100 ? 25 100 ns pfc-ok signal circuit block (pfc_ok pin) output low voltage ? 0.5 1 ? 0.5 1 v output high voltage 17 17.5 ? 17 17.5 ? v free datasheet http:///
CXA3810M - 19 - ac peak voltage monitor circ uit block (ac_vrms pin) internal pull-down resistor value 0.8 1.0 1.2 0.8 1.0 1.2 m ? ac off discharge resistor value 104 130 156 104 130 156 k ? sag recovery automatic switching voltage 4.95 5.10 5.25 4.95 5.10 5.25 v zcd protection disable voltage 7.14 7.29 7.44 7.14 7.29 7.44 v pfc overcurrent detection circuit block (pfc_cs pin) overcurrent detection voltage1 0.365 0.4 0.435 0.365 0.4 0.435 v overcurrent detection voltage2 0.365 0.4 0.435 0.365 0.4 0.435 v power limit detection voltage1 0.439 0.488 0.537 0.439 0.488 0.537 v power limit detection voltage2 0.216 0.24 0.264 0.216 0.24 0.264 v blanking time 200 250 300 200 250 300 ns delay time 100 150 200 100 150 200 ns pfc zero current detection circuit block (pfc_zcd pin) input threshold voltage 1.2 1.3 1.4 1.2 1.3 1.4 v hysteresis width 180 200 220 180 200 220 mv clamp high voltage 4 4.4 5 4 4.4 5 v clamp low voltage 0.3 0.6 1 0.3 0.6 1 v restart timer delay 180 200 220 180 200 220 ? s minimum off time (when overcurrent is detected) 3.32 4.00 4.73 3.32 4.00 4.73 ? s blanking time (384) (480) (576) (384) (480) (576) ns error amplifier output circuit block for pfc voltage control (pfc_vao pin) trans-conductance ? (90) ? (90) ? a/v output high clamp voltage 3.1 3.3 3.5 3.1 3.3 3.5 v power limit clamp voltage ratio1 85 90 95 85 90 95 % power limit clamp voltage ratio2 75 80 85 75 80 85 % power limit clamp voltage ratio3 65 70 75 65 70 75 % power limit clamp voltage ratio4 55 60 65 55 60 65 % power limit clamp voltage ratio5 45 50 55 45 50 55 % power limit clamp voltage ratio6 35 40 45 35 40 45 % source current 10 20 40 10 20 40 ? a output low voltage 0 ? 0.2 0 ? 0.2 v sink current 5 15 25 5 15 25 ? a pfc maximum on time control circuit block (pfc_tonmax pin) discharge time ? ? 150 ? ? 150 ns on time1 25.74 27.68 29.62 25.74 27.68 29.62 ? s on time2 6.38 7.09 7.80 6.38 7.09 7.80 ? s item specification ratings (ta = 27 ? c) design guarantee ratings (ta = ?25 to +85 ? c) ( *1 ) unit min. typ. max. min. typ. max. free datasheet http:///
CXA3810M - 20 - pfc output voltage detection circuit block (pfc_vsense pin) pfc stop voltage 2.659 2.7 2.742 2.657 2.7 2.744 v pfc stop cancel voltage 2.548 2.6 2.652 2.548 2.6 2.652 v pfc control voltage 2.475 2.5 2.525 2.475 2.5 2.525 v pfc non-operating detection voltage and b_ok high level threshold 2.28 2.4 2.52 2.28 2.4 2.52 v b_ok low level threshold 2.254 2.3 2.346 2.254 2.3 2.346 v resonant controller operation start voltage 2.100 2.143 2.186 2.100 2.143 2.186 v resonant controller operation stop voltage 1.789 1.883 1.977 1.789 1.883 1.977 v pfc stop voltage during active standby 1.654 1.688 1.722 1.654 1.688 1.722 v pfc stop cancel voltage during active standby 1.523 1.554 1.585 1.523 1.554 1.585 v resonant operation voltage during active standby 1.390 1.419 1.448 1.390 1.419 1.448 v pin short-circuit detection 0.2 0.3 0.4 0.2 0.3 0.4 v pull-up current 0.05 0.1 0.2 0.05 0.1 0.2 ? a resonant controller stop voltage adjustment circuit block (rm_offadj pin) latch voltage for external error detection 3.8 4 4.2 3.8 4 4.2 v pfc overvoltage detection circuit block (pfc_ovp pin) pfc overvoltage detection voltage 2.857 2.922 2.981 2.855 2.922 2.983 v pull-up current 0.05 0.1 0.2 0.05 0.1 0.2 ? a resonant controller output circuit block (rm_outp, rm_outn pins) output low voltage ? 0.05 0.1 ? 0.05 0.1 v output high voltage 17.9 17.95 ? 17.9 17.95 ? v rise time ? 35 100 ? 35 100 ns fall time ? 35 100 ? 35 100 ns resonant controller soft start circuit block (rm_ss pin) soft start current1 7.5 10 12.5 7.5 10 12.5 ? a soft start current2 4.69 6.25 7.81 4.69 6.25 7.81 ? a clamp voltage 2.3 2.5 2.7 2.3 2.5 2.7 v overcurrent timer latch detection voltage 3.8 4 4.2 3.8 4 4.2 v charging current during overcurrent detection 3.2 5.0 6.8 3.2 5.0 6.8 ? a item specification ratings (ta = 27 ? c) design guarantee ratings (ta = ?25 to +85 ? c) ( *1 ) unit min. typ. max. min. typ. max. free datasheet http:///
CXA3810M - 21 - *1 ratings are design guarantee values within this temperature range. *2 specification values at room temperature may not be satisfied because of temperature dependence. resonant controller soft start circuit block (rm_rt pin) maximum oscillation frequency 800 ? ? 800 ? ? khz deadband width 270 300 330 270 300 330 ns multiple number of clamp frequency when soft star 3.0 3.5 4.0 3.0 3.5 4.0 time s resonant controller minimum frequency adjustment circuit block (rm_fmin pin) setting frequency 1 ?3.0% 46.1 +3% ?3.8%( *2 ) 46.1 +3.0%( *2 ) khz setting frequency 2 ?4.0% 96.7 +4% ?4.7%( *2 ) 96.7 +4.0%( *2 ) khz setting frequency 3 ?5.0% 144.1 +5.0% ?5.6%( *2 ) 144.1 +5.0%( *2 ) khz constant current detection threshold 0.85 1.25 1.65 0.85 1.25 1.65 ? a resonant controller current detection circuit block (rm_cs1 pin) positive side detection 0.209 0.22 0.231 0.209 0.22 0.231 v negative side detection ?0.295 ?0.26 ?0.23 5 ?0.295 ?0.26 ?0.235 v detection delay time 100 150 200 100 150 200 ns detection mask time 384 480 576 384 480 576 ns overcurrent detection voltage ratio when +b falls 10 15 20 10 15 20 % rm_cs1 pin offset current 6.6 9.5 12.5 6.6 9.5 12.5 ? a resonant controller current detection circuit block (rm_cs2 pin) continuous load detection voltage 0.158 0.175 0.193 0.158 0.175 0.193 v detection mask time (384) (480) (576) (384) (480) (576) ns continuous load detection time ? (10) ? (10) s rm_cs2 pin offset current ?1.0 0 1.0 ?1.0 0 1.0 ? a item specification ratings (ta = 27 ? c) design guarantee ratings (ta = ?25 to +85 ? c) ( *1 ) unit min. typ. max. min. typ. max. free datasheet http:///
CXA3810M - 22 - detailed descripti on of each block ? common circuit block 1. misdetection prevention circuit fig. 1. equivalent circuit of 1 ms ? 3 times-sampling chatter filter fig. 1 above shows the equivalent circuit of 1 ms ? 3 times-sampling chatter filter. when clk has a 1 ms cycle, comp out is monitored at the rising edge of every 1 ms, and the output q is defined when it reaches three times. the other chatter filters also operate using a similar circuit. the clocks used for each setup time are generated by frequency dividing the 1 mhz clock. the setup time variance of the 1 ms ? 3 times chatter filter in the example above is as follows. variance of 2 ms < setup time < 3 ms occurs due to the comp out inversion timing. in addition, taking into account the basic clock 1 khz variance, the 1 ms (1024 ? s) clock has variance of 0.972 ms to 1.075 ms ( ? 5 %), so at the maximum variance the setup time variance is 1.944 ms < setup time < 3.225 ms. setup time of misdetection prevention counter (when the basic clock of 1mhz has no variance) used for this ic is shown below. ? corresponds to 1 ? s ? 4 times......................................3 ? s to 4 ? s ? corresponds to 4 ? s ? 3 times......................................8 ? s to 12 ? s ? corresponds to 16 ? s ? 3 times....................................32 ? s to 48 ? s ? corresponds to 32 ? s ? 3 times....................................64 ? s to 86 ? s ? corresponds to 128 ? s ? 3 times..................................256 ? s to 384 ? s ? corresponds to 128 ? s ? 5 times..................................512 ? s to 640 ? s ? corresponds to 1ms ? 3 times.....................................2ms to 3ms (converted by 1ms for 1.024ms) ? corresponds to 1ms ? 5 times.....................................4ms to 5ms ? corresponds to 8ms ? 6 times.....................................40ms to 48ms (converted by 8ms for 8.192ms) ? corresponds to 66ms ? 8 times...................................462ms to 528ms (converted by 66ms for 65.5ms) ? corresponds to 2.1s ? 3 times......................................4.2s to 6.3s (converted by 2.1s for 2.097s) ? corresponds to 2.1s ? 5 times......................................8.4s to 10.5s q comp out clk q ck dq qck dq qck dq q s r q q comp out clk free datasheet http:///
CXA3810M - 23 - 2. ac detecti on circuit block fig. 2-1 shows the ac detection block equivalent circuit. fig. 2-1. ac detection block equivalent circuit the ac detection circuit block detects the ac input volt age by directly monitoring the full-wave rectified ac input waveform. the wave input to the ac_detin pin is peak-held at the ac_vrms pin by a buffer circuit, and reference voltages equivalent to 65% (vth1) of the peak value are generated internally. the ac input is constantly monitored to determine the voltage range by comparing these reference voltages and the ac_detin pin voltage. the ac_vrms pin voltage is co mpared with the internal reference voltages, and ac input is detected when the ac_vrms pin voltage is 1.85v or more, or ac off when 1.65v or less. when r1 = 1320k ? and r2 = 27k ? in fig. 2-1, ac input is detected when vac = 65.3vrms or more. in addition, connect a capacitor of at least 0.47 ? f or more to the ac_vrms pin.an internal resistor is provided to generate the 65% voltages of the ac_vrms pin voltage, and when this exte rnal capacitance value is too small, discharge may make peak hold impossible. vth1 ac_vrms ac_detin ac_detout logic 65% ac_65 r1 r2 c1 1.85v/1.65v vrms_ok free datasheet http:///
CXA3810M - 24 - fig. 2-2 shows the state transition diagram for the ac off detection circuit. the state transition conditions are related to the por, ac65 and vrmsok input signals, and the timer values in each state. por is the ic reset signal, and ac65 and vrmsok are the outputs of each comparator shown in fig. 2-1. 4 ? s ? 3 times filter processing is applied to these signals.the state trans ition logic operating frequency is 7.8khz. in addition, regardless of the state transitions shown in fig. 2-2, vrmsok2 = high (ac_vrms pin voltage > 1.85v) must be set up to obtain ac_detout = high output at start-up. after vrmsok2 = high is detected (1ms ? 3 times), ac_detout goes high. fig. 2-2. ac detection state transition diagram the ac_detout pin is the output signal for this functi on, and outputs high when the ac input state is normal, or low when ac off or other abnormal state is detec ted. changing ?l? to ?h? of ac_detout pin requires detecting "c" period one time or remaining in "c" period 10ms or more. any state reset vrng ac_detout = l ac_detout = l ac_detout = l ac_detout = l c ng b init por = l non sync por = h wait ac_detout = h ac_detout = h ac_detout = h vrmsok = h vrmsok = l 12ms time out vrmsok = h ac65 = 1 after 12ms wait ac80 = l ac80 = h ac80 = 1 vrmsok = 0 8ms time out vrmsok = l free datasheet http:///
CXA3810M - 25 - fig. 2-3 shows an image of the state trans itions when normal ac input continues. fig. 2-3. ac_detin input waveform and state transitions in fig. 2-3, the internal logic signal transitions as follows. ? when the ac input rises to 65% or more within 8ms after the state transitions to "b", the state transitions to "c". ? when the ac input falls to 65% or less after the state transitions to "c", the state transitions to "b". when the above cycle repeats, ac_detout continues to output high. other behaviors during start-up or ac volt age off are described on the following pages. 65% cb b c b h ac_detin ac65 logic state ac_detout 8ms 8ms free datasheet http:///
CXA3810M - 26 - ? during normal start-up ? when por is canceled after power-on, the state trans itions to "init". ac_detout is low output in the "reset" and "init" states. ? when the ac_vrms pin voltage rises to 1.85v or more in the "init" state, the state transitions to "wait" (t1). ? when the ac_detin pin voltage exceeds 65% of the ac_vrms pin voltage after 12ms have elapsed in the "wait" state, the state transitions to "c" (t2) and the normal state judgment cycle starts. init c b wait h l cb t1 t2 12ms reset 1.85v ac_detout logic state por ac_vrms vdd 65% ac_detin free datasheet http:///
CXA3810M - 27 - ? start-up when the ac voltage is low ? when the ac_vrms pin voltage does not reach 1.85v within 12ms in the "init" state after por is canceled, an ac input error is judged, the state transitions to "vrng", and ac_detout continues to output low (t1). ? when the ic detects that the ac_vrms pin voltage has risen to 1.85v or more in the "vrng" state, the state transitions to "wait" (t2). ? when the ic detects "c" period after 12ms has pass ed in the "wait" state, ac_detout = ?h? output is setup (t3). : h ac_vrms ac_detout logic state t2 t1 t3 reset init vrng wait 9?9? bb 12ms 1.85v vdd por 1.85v (vac = 65vrms) ac_detin free datasheet http:///
CXA3810M - 28 - ? when ac off occurs in the "wait" state (1) ? when the ac_vrms pin voltage falls to 1.85v or less in the "wait" state, ac off is judged, the state transitions to "vrng" (t1). in this case, the ac _detout pin does not output ?h? because "c" period is not detected. ? when ac off occurs in the "wait" state (2) ? when the ac_vrms pin voltage is 1.85v or more but the ac_detin pin voltage has not reached 65% of the ac_vrms pin voltage (the state has not transitioned to "c") within 25ms after the state transitions to "wait", ac off is judged, the state transitions to "ng", and the ac_detout outputs low.in this case, the ac_detout pin does not output high because "c" period is not detected. 65% vdd por t1 ac off ac_detin logic state ac_detout 1.85v reset init vrng wait l ac_vrms 25ms l ng wait init ac off ac_vrms 1.85v 65% ac_detin logic state ac_detout free datasheet http:///
CXA3810M - 29 - ? during normal ac input ? when the ac_detin pin voltage rises to 65% or more of the ac_vrms pin voltage within 8ms after the state transitions to "b", the state transitions to "c". ? ac_detout continues to output high even if ac_d etin voltage does not decrease to 0v when the state continues to repeat the cycle of ?c? ? ?b? ? ?c?. ? ac off in the "b" state ? when the ac_detin pin voltage does not rise to 65% or more of the ac_vrms pin voltage within 8ms after the state transitions to "b", ac off is judged, the state transitions to "ng", and ac_detout outputs low. ? ac off in the "c" state ? when the ac_detin pin voltage does not fall to 65% or less of the ac_vrms pin voltage after the state transitions to "c", ac off is not judged and the ac_detout continues to output high. in other words, ac off is not judged in the "c" state. ? ac off in the "c" state is judged after the ac_det in pin voltage falls to 65% or less of the ac_vrms pin voltage and the state transitions to "b" or the ac_vrms pin voltage falls to 1.85v or less. cc bb b h 65% ac_detin ac65 logic state ac_detout 8ms ac off cb 8ms ng h l 65% ac_detin ac65 logic state ac_detout free datasheet http:///
CXA3810M - 30 - ? return to the normal cycle from the "ng" state (1) ? when the ac_detin pin voltage rises to 65% or more of the ac_vrms pin voltage while the ac_vrms pin voltage is 1.85v or more in the "n g" state, the state transitions to "c", the ac_detout outputs high (t1), and the normal state judgment cycle starts. ? return to the normal cycle from the "ng" state (2) ? when the ac_vrms pin voltage falls to 1.85v or less in the "ng" state, the state transitions to "vrng". ? when ac is input again and the ac_vrms pin voltage ri ses to 1.85v or more, the state transitions to "wait", then, when the ac input rises to 65% or more the state transitions to "c". after that, the ac_detout = high output is setup and the normal state judgment cycle starts. l h t1 1.85v ac_vrms 65% ac_detin ac65 logic state ac_detout c ng b b c ac_vrms 1.85v l h ac65 logic state ac_detout 12ms wait ng c c vrng bb 65% ac_detin free datasheet http:///
CXA3810M - 31 - ? ac_vrms pin discharge function in the "ng" state ? this ic has a function of discharging the ac_vrms pi n in the "ng" state in order to return quickly to the state of the ac_detout = ?h? when ac off is detected because ac input voltage is changed rapidly. ? when 8ms or more has passed after the state transitions to "b", the state transitions to "ng" and starts discharge of the ac_vrms pin (t1). ? discharge of the ac_vrms pin continues till the ac_detin pin voltage exceeds 65% of the ac_vrms pin voltage (t2) or the ac_vrms pin voltage falls to 1.85v or less. ? when the ac_detin pin voltage exceeds 65% of the ac_vrms pin voltage, the state transitions to "c". and the ac_detout outputs high (t2) and the normal state judgment cycle starts. :?:?:?:? l :w logic state h :?:?:| :?:?:?:-:?::a :?:?:?:?:?:?:?: :?:?:?:?:?:?:|:?:? h t1 t2 ng c c c b b b 8ms free datasheet http:///
CXA3810M - 32 - 3. mode1, mode2 pin voltage detection circuit block four normal mode of standby mode, sequence start-up mode, rapid start-up mode and active standby mode can be set in accordance with the mode pin input voltage.in addition, this ic has two test modes used to set the minimum resonant controller and to check pfc overcurrent point. the table below shows mode1, mode2 pin voltage setting and mode transition setup time in each mode. in addition, intermediate voltage in the table indicates 5.6v to 7.6v. mode1 pin mode2 pin operation mode description of operation mode mode setup time vcc or open vcc or open standby mode standby mode acdet enable/pfc off/resonant controller off 32 ? s ? 3 times gnd gnd sequence start-up mode sequence start-up mode same as cxa3809 after +b > 330v is detected, resonant controller starts up by 8ms ? 6 times. 32 ? s ? 3 times vcc or open gnd rapid start-up mode start-up mode aimed at shortening start-up time after +b > offadj is detected, resonant controller starts up by 8ms ? 4 times. 32 ? s ? 3 times gnd vcc or open active standby mode mode aimed at developing efficiency when applying light load pfc performs burst operation (single operation) at 260v to 240v, resonant controller starts up by 8ms ? 4 times after +b > 220v is detected. 16 ? s ? 3 times vcc or open interme diate voltage pfc overcurrent test mode test mode to disable power limit outputs overcurrent detection signal from b_ok pin, start-up is same as seq start-up mode. 1ms ? 3 times interme diate voltage vcc or open resonant test mode test mode to check resonant frequency same as test mode when cxa3809 mode pin voltage = intermediate voltage during this mode, ac_detout/b_ ok pin is hi-z. 1ms ? 3 times free datasheet http:///
CXA3810M - 33 - 4. state transition between operation modes fig. 4 shows the state transition diagram between operation modes.transition between active standby mode and rapid start-up mode requires simultaneous inversion of mode1 and mode2 logic. always switch logic through mode1 = ?l?, mode2 = ?l? because the state may transition to standby mode if the state of mode1 = ?h?, mode2 = ?h? is occurred even in a socond. fig.4 state transition diagram mode1 = h mode2 = l mode1 = l mode2 = l mode1 = h mode2 = h mode1 = h mode2 = h transition condition to test mode is described separately. mode1 = l mode2 = h mode1 = h mode2 = h mode1 = h mode2 = h latch condition satisfied mode1 = l mode2 = h mode1 = h mode2 = l mode1 = l mode2 = l mode1 = l mode2 = h latch condition satisfied latch condition satisfied test stby active stby ng seq start-up rapid start-up free datasheet http:///
CXA3810M - 34 - 5. b_ok signal output circuit block when the pfc output voltage (+b) rises to 370v or more is detected, the b_ok signal goes to high output.in addition, when the pfc output voltage falls to 354v or less is detected, the b_ok signal goes to low output.detection setup time is correspondence of 128 ? s ? 3 times for both rise and fall. fig. 5 shows the b_ok signal output timing chart. in addition, the b_ok signal is also low during the follwing operations. ? during ng latch ? when transition to standby mode ? when the pfc circuit is stopped (after ac_vrms < 1.65v, 66ms ? 8 times is set up) fig.5. b_ok signal output sequence mode1 mode2 b_ok 2.400v (370v) 2.400v (370v) 2.300v (354v) l h h stby stby sequence start-up pfc_vsense (+b) ic operation mode 32s 3 times 128s 3 times 128s 3 times 128s 3 times 32s 3 times free datasheet http:///
CXA3810M - 35 - ? pfc block 6. pfc control circuit block this ic has control circuit of power-factor correction co nverter in critical conduction mode. fig. 6-1 describes an overview of operation. fig. 6-1. pfc circuit block diagram this ic performs pfc control in critical conduction mode that applies self-oscillation. fig. 6-2 shows the output waveform of each block in the steady state. t1 : when mosfet q1 goes on, sw1 goes off, and the inductor current (il) rises from zero at the slope vin/l. at the same time charging starts to the internal capacitor ct1, and continues until the ct1 voltage reaches the pfc_vao pin voltage.the pfc_vao pin voltage value corresponds to the pfc output voltage (vout). t2 : when the ct1 voltage reaches the pfc_vao pin voltage, tonmax_comp inverts and a high signal is output, the reset signal is input to the rs latch circuit, and q1 goes off. when q1 goes off, the inductor voltage inverts, and current is supplied to the output side via the diode.in addition, during this period the inductor current decreases at the slope (vout ? vin)/l, and a positive voltage is generated in the auxiliary winding (pfc_zcd pin voltage). the charge st ored on the ct1 is discharged instantly by setting sw1 to on. t3 : when the inductor current reaches 0a, the inductor voltage drops rapidly, and at the same time the pfc_zcd pin voltage also drops. when the ic detects t hat the pfc_zcd pin voltage has fallen to 1.3v or less, the set signal is input to the rs latch circuit, q1 is turned back on, and operation shifts to the next switching cycle. critical conduction mode switching is continued by repeating the above operations.note that pfc control circuit in critical conduction mode, the switching frequently changes constantly according to the instantaneous value of the ac input voltage. 2.5v pfc_vao pfc_vsense pfc_out 1.3v pfc_zcd s r q q edge extraction voltage amplifier pfc_drv vref zcd_comp tonmax_comp pfc_out vout q1 sw1 ct1 il free datasheet http:///
CXA3810M - 36 - fig. 6-2. switching operation block waveforms pfc_vao pin voltage internal timing capacitor ct1 voltage pfc_out zcd_comp output falling edge detection (set signal) inductor current (il) tonmax_comp output (reset signal) t1 t2 t3 free datasheet http:///
CXA3810M - 37 - 7. pfc operation in active standby mode pfc performs burst operation in active standby mode. fi g. 7-1 shows the outline of pfc burst operation.when +b voltage falls to 240v or less is detected pfc operation starts, and when +b voltage rises to 260v or more is detected pfc operation stops. fig. 7-1 outline of pfc burst operation fig. 7-2 shows the outline of pfc start-up in active standby mode.ic transitions from standby mode to active standby mode by voltage setting of mode1 and mode2 (t1), and pfc starts up and starts burst operation after correspondence of 1ms ? 3 times when ac_vrms pin voltage is 1.85v or more (t2). the clamp voltage of pfc_vao is fixed to 1.2v in active standby mo de.when ic transitions from active standby mode to sequence start-up mode (t3), pfc switches from burst operation to normal operation with continuous oscillation. fig. 7-2 outline of pfc start-up in active standby mode 260v 240v +b l pfc starts in active standby mode. pfc_out mode1 mode2 pfc_vao ac_vrms ic operation mode pfc operation mode 1ms 3 times vao clamp voltage = 1.2v 32s 3 times 1.85v off t1 burst active stby stby sequence start-up continuous t2 t3 32s 3 times free datasheet http:///
CXA3810M - 38 - 8. pfc zero current de tection circuit block the zero current detection circuit performs critical conduc tion mode operation, so this circuit detects that the inductor current has become 0a. fig. 8 shows the equiva lent circuit diagram.when the voltage of the inductor auxiliary winding connected to the pfc-zcd pin is set at the polarity shown in fig. 8, a positive voltage is generated in the auxiliary winding when mosfet_q1 is off, and a negative voltage is generated in the auxiliary winding l when mosfet_q1 is on.this auxiliary winding voltage varies greatly according to the input voltage and the circuit configuration, so internal upper limit and lower limit clamp circuits are provided. a resistor (rzcd) is required to limit the outflow and infl ow current to the clamp circuit to ensure normal ic operation. set the rzcd value so that this clamp circuit current is ? 3ma or less. threshold mode control that uses self-oscillation requi res a trigger signal to realize stable operation during start-up or under light load conditions.this ic has a restart timer, and when the pfc_out output is continuously off for 200 ? s (typ.) or more, the trigger signal is automatically generated and mosfet_q1 is turned on. in addition, an internal maximum oscillation frequency limit function (fpfcmax) is provided to prevent the pfc oscillation frequency from rising excessively during abno rmal operation when an output diode short-circuit or other overcurrent state is detected. after an overcurrent is detected, the pfc output is forcibly turned off using pulse-by-pulse control.in this case, a counter (t_offmin: 4 ? s (typ.)) that temporarily fixes the pfc output low operates by overcurrent detection signal.the signal from pfc_zcd is masked during that period, and a high output pulse is generated after counter operation ends. fig. 8. zcd control bl ock equivalent circuit 1.3v 1.5v pfc_zcd s r q q edge extraction several 100ns t_offmin 200s lower clamp 0.6v upper clamp 4.4v v cc q1 pfc_out rzcd pfc_cs inversely propotional to vrms pfc_cs restart timer free datasheet http:///
CXA3810M - 39 - 9. pfc maximum on time control circuit block the pfc_out on time (tonmax) is det ermined by ac_vrms pin voltage, the capacitor (ct) connected to the pfc_tonmax pin and the charging current (ichg) from the ic.maximum on time is obtained by the following equation. when ct = 470pf, ac_vrms = 2.5v, maximum on time is 26.5 ? s (typ.).in addition, the pfc_out pin on time according to the pfc_vao pin voltage (vvao) is obtained by the following equation. the offset voltage (voffset) is 0.18v (typ.). the maximum on time is limited by the reference voltage of 3.0v generated in the ic though the maximum clamp voltage of the pfc_vao pin is 3.3v (typ.).f ig. 9 shows the equivalent circuit diagram near the pfc_tonmax pin. fig. 9. maximum on time cont rol block equivalent circuit tonmax [ ? s ? 0.365 ct [pf] ? ac_vrms [v] 2 ---------------------------------------- 0.227 + = ton [ ? s ? 0.1294 ct [pf] ? vvao voffset ? ?? [v] ? ac_vrms [v] 2 --------------------------------------------------------------------------------------------------------- 0.227 + = pfc_out vcc 3.0v voffset max_on control s r q q vref 2.5v pfc_vsense pfc_vao pfc_tonmax ct ac_vrms pfc_out1 x 2 x multiplier vvao free datasheet http:///
CXA3810M - 40 - 10. pfc_vao clamp voltag e control circuit block this ic has a function that limits the power util izing current detection operation by pfc_cs pin as a countermeasure against choke winding and film capacitor squealing due to overcurrent control during startup and ac input voltage sag recovery. the threshold (vthcs1, vthcs2) of overcurrent detection level (0.4v) is set for the pfc_cs pin, and the pfc_out pin voltage is forcibly decreased to low when the pfc_cs pin voltage reaches 0.4v. in addition, the threshold (vthdpl1, vthdpl2) which is dynamic power limit level is set for pfc_cs pin, and this value is the sum of the composition inversely proportional to the ac_vrms pin and the correction composition proportional to the ac_vrms pin. the correction compos ition enables acquisition of more power in the higher ac input voltage range when the conduction angle becomes narrower as the ac input voltage is higher. fig. 10-1. pfc_cs overcurrent detection and power limit level fig.10-1 shows overcurrent detection and power limit level of the pfc_cs pin. the threshold voltage of power limit can be obtained by the following equation. overcurrent detection level power limit level 0.60 0.50 0.40 0.30 0.4 0.20 0.10 1.0 2.0 fpc ocp/dpl detection voltage [v] 3.0 ac_vrms [v] 4.0 5.0 6.0 7.0 8.0 0 0.040 0.240 0.488 0.200 v thdpl [v] 1.20 ac_vrms [v] ------------------------------------- - 6.67 10 3 ? ac_vrms [v] ? ? + = free datasheet http:///
CXA3810M - 41 - when the pfc_cs pin voltage reaches the threshold above, the pfc_vao pin voltage changes step by step by dynamic power limit.details of the operation are as follows.the clamp value of the pfc_vao pin vlotage is set to 3.3v in normal operation, and the pfc_vao pin vlotage is clamped at the previous pfc_vao pin voltage or lower when the pfc_cs pin vo ltage reaches dynamic power limit level. the pfc_vao clamp voltage is selected from the six poi nts from 1.2v to 2.7v increment of 0.3v.when the pfc_cs pin voltage does not reach the threshold of dynamic power limit in master side switching cycle, the clamp value is set to the voltage by 0.3v higher at the start of the next cycle, in other words when outputting on pulse of the pfc_out pin. the clamp voltage control operation above is perform ed every on pulse output of the pfc_out pin. adjustment of the pfc_vao pin clamp voltage prevents squealing due to overcurrent detection operation.fig.10-2 shows the timing chart of clamp voltage control sequence of the pfc_vao pin. fig. 10-2. pfc_vao clamp voltage cancel sequence vthcs1 vthdy1 pfc_cs pfc_out 3.3v 2.7v 2.4v 2.4v 2.1v 2.1v 1.8v 1.8v 2.1v 2.4v 2.7v 2.9v pfc_vao clamp voltage pfc_vao free datasheet http:///
CXA3810M - 42 - 11. pfc sequence control circuit block when ac input sag recavery this ic incorporates pfc recovery sequence control circuit for preventing pfc overcurrent when recovering from ac input voltage sag.if the boost operation of pfc st arts while the current is flowing from ac input side to the direction of pfc output when ac recoveried, the mosfet may have breakdown because the excessive drain current flows into the mosfet of boost converte r. the recovery sequnce control circuit perfoms the following control to avoid such phenomenon. in addition, phenomenon which current flows from ac input side to the direction of pfc output occurs only when the ac input voltage is higher than the pfc output voltage. when the ac input voltage is lower than the pfc output voltage, the pfc operation should be started as soon as possible after ac recover from output voltage hold ti me point of view. therefore, the operation of this function varies according to the ac input voltage. this ic takes sampling of the ac_vrms pin voltage at the moment when changing the ac_detout pin voltage from ?h? to ?l? by detection of ac off. when the ac_vrms pin voltage is higher than 5.1v (1) control below is enabled, and when the ac_vrms pin voltage is lower than 5.1v (2) control below is enabled. (1) when ac input voltage is high (ac_vrms > 5.1v) ? pfc restart timer control pfc restart timer is disabled so that the mosfet switching operation does not occur when the ac_detout pin voltage changes to ?l?.when the restart timer is enabled again is the timing when the ac_detout pin voltage changes to ?h? by detection of the second "c" period after ac recover. ? zero current detection circ uit control by pfc_zcd pin the zero current detection operation by the pfc_zcd pin is disabled 10ms after the ac_detout pin voltage is ?l? and the ac_detin pin voltage falls to 1.95v or less so that the pfc operation does not restart by error detection in the zero current det ection circuit of choke winding by the pfc_zcd pin when the current flows from the ac input side to the pfc output.when the zero current detection circuit is enabled again is the timing when the ac_detout pin voltage changes to ?h? by detection of the second "c" period after ac recover. in addition, when the ac_detin pin voltage rises to 1.95v or more within 10ms after the ac_detin pin voltage falls to 1.95v or less, it is regarded as not instantaneous outage of ac input but rapid change of ac input as shown in the fig. 11-2. this control is not performed because the continued pfc operation is required for limitting decrease of the pfc output voltage as small as possible. ? pfc_vao pin voltage control the pfc_vao pin voltage rises and reaches high clamp voltage soon because the pfc output voltage falls when ac input sag occurs. the pfc overcurrent protection may function when the ac input is recovered from this state.in order to avoid this, the pfc_vao pin voltage is held so that it does not rise more 20ms after the ac_detout pin voltage is ?l?. when the hold of the pfc_vao pin voltage is cancelled is the timing when the ac_detout pin voltage changes to _h? by detection of the second "c" period after ac recovery. free datasheet http:///
CXA3810M - 43 - fig. 11-1. recovery from instanteneous voltage outage of ac input 200v fig. 11-2. rapid voltage change of ac input 200v 1.95v ac_detin ac_detin vs 1.95v comparator ac_detout pfc restart pfc_vao pfc_zcd 10ms 20ms 65% enable disable enable hold normal normal normal normal mask monitors ac_detin for 10ms after ac_detin > 1.95v 10ms 20ms when ac_detin > 1.95v, regarded as rapid change and over id prevention sequence immediately cancelled 1.95v ac_detin ac_detin vs 1.95v comparator ac_detout pfc restart pfc_vao pfc_zcd enable disable enable normal normal normal normal free datasheet http:///
CXA3810M - 44 - (2) when ac input voltage is low (ac_vrms < 5.1v) ? pfc restart timer control pfc restart timer is disabled so that the mosfet switching operation does not occur when the ac_detout pin voltage changes to ?l?. when the restart timer is enabled again is the timing when the first "c" period is detected after ac recovery. ? zero current detection circ uit control by pfc_zcd pin when the ac input voltage is low, the zero current detection operation by the pfc_zcd pin is always enabled because the continued pfc operation is requir ed for limitting decrease of the pfc output voltage as small as possible. ? pfc_vao pin voltage control the pfc_vao pin voltage is held in order to av oid phenomenon which the pfc overcurrent protection functions when returning from the ac input sag 20ms after the ac_detout pin voltage is ?l?. when the hold of the pfc_vao pin voltage is cancelled is the timing when the first "c" period is detected after ac recovery. fig.11-3 enable disable enable hold normal normal normal 20ms ac_detin ac_detout pfc restart pfc_vao pfc_zcd 65% free datasheet http:///
CXA3810M - 45 - 12. pfc output voltage detection circuit block fig. 12 shows the equivalent circuit t he area around the _vsense and pfc_ovp pins. fig. 12. pfc output voltage de tection block equivalent circuit 2.922v (+b = 450v) 2.700v (+b = 416v) 2.600v (+b = 400v) 2.500v (+b = 385v) 2.400v (+b = 370v) 2.300v (+b = 354v) 1.688v (+b = 260v) 1.554v (+b = 240v) 1.419v (+b = 220v) 0.3v 2.143v (+b = 330v) pfc output stop pfc output stop cancel pfc not operating detection b_ok high judgment (inverse) b_ok low dudgment resonant controller operation start pfc stop when active stby resonant operation when active stby pfc stop cancel when active stby pfc_vsense pin short-circuit detection resonant controller stop voltage amplifier vout (+b) pfc output overvoltage latch (ovp1) 0.1a r1 r2 0.1a pfc_vao pfc_ovp vref pfc_vsense rm_offadj free datasheet http:///
CXA3810M - 46 - the pfc_vsense pin detects the pfc output voltage, and is also the circuit that performs rise sequence control during start-up, and protects against output voltage fluctuations due to rapid load changes. ? pfc overvoltage output stop pfc_out output is stopped when pfc_vsense > 2.7v (+b > 416v) is detected. pfc_out output is canceled when pfc_vsense < 2.6v (+b < 400v) is detected. ? pfc not operating detection and b_ok pin ?h? output level threshold ic latch operation results after pfc ? vsense < 2.4v (+b < 370v) is detected for 10s (corresponds to 2.1s ? 5 times) or more. the b_ok pin output goes to ?h? when pfc_ vsense > 2.4v (+b > 370v) is detected. ? b_ok pin ?l? output level threshold the b_ok pin output goes to ?l? when pfc_ vsense < 2.3v (+b < 354v) is detected. ? resonant controller operation start resonant controller operation is started when pfc_vsense > 2.143v (+b > 330v) is detected. ? resonant controller stop resonant controller operation is stopped w hen pfc_vsense < rm_offadj is detected. ? pfc burst control in active standby mode pfc_out output is stopped when pfc_vsense > 1.688v (+b > 260v) is detected. pfc_out output is canceled when pfc_vsense < 1.554v (+b < 240v) is detected. ? resonant controller operation start voltage in active standby mode resonant controller operation is started when pfc_vsense > 1.419v (+b > 220v) is detected. resonant controller operation is stopped when pf c_vsense > 1.419v (+b > 220v) is detected. ? pfc_vsense pin open/shor t-circuit detection it stops pfc_out output when pfc_vsense < 0.3v is detected by open of resistor r1, short-circuit of resistor r2, etc. in addition, when the pfc_vsense pin is open, the pin voltage is forcibly pulled up by the internally supplied 0.1a constant current, and the ic is latched when pfc_vsense > 2.922v is detected. the pfc_ovp pin is a protective pin for when a pfc_ vsense pin abnormality o ccurs.pfc_vsense pin, the pfc_ovp pin detects the pfc output voltage, and has only an overvoltage protection function. the detection voltage of pfc_ovp pin is the same as the detection voltage of pfc_vsense, and the reference voltage is set from the same resistor ladder. ? pfc overvoltage latch (pfc_ovp pin) ic latch operation results after fc_ovp > 2.922v (+b > 450v) is detected. ? pfc_ovp pin open detection when the pfc_ovp pin is open same as the pfc_vsense, the pin voltage is forcibly pulled up by the internally supplied 0.1a constant current, and t he ic is latched when pfc_ovp > 2.922v is detected. free datasheet http:///
CXA3810M - 47 - ? resonant controller block 13. oscillator block 13-1. oscillator circuit block fig. 13-1. oscillato r equivalent circuit fig. 13-1 shows the equivalent circuit for oscillator circuit. outputs of some current mirror circuits are connect ed to internal timing capacitor, discharge switch , and positive input of comparator. the resonant oscillati on frequency is determined by the current led from the rm_rt pin, the current from the minimum frequency se tting circuit, and the current from the soft start circuit. the deadband width is fixed internally to 300 ns. the fig. 13-2 graph shows the resonant oscillation frequency response at a minimum frequency setting of 46.1 khz, relative to the current led from the rm_rt pin. fig. 13-2. resonant oscillation frequency 3.6v rm_rt 2.4v cs1_ng backflow_ng s r q q deadband 300ns n p vref in irt ss_current fmin_current rm_outp rm_outn pulse distribution rm_outn driver rm_outp driver frequency (rm_out) [khz] rm_rt current [a] 0 50 100 150 200 250 300 350 400 0 50 100 150 200 resonant oscillation frequency when rfmin = 390k connected (46.1khz setting) free datasheet http:///
CXA3810M - 48 - 13-2. minimum frequency setting circuit block fig. 13-3. minimum frequency c ontrol block equivalent circuit fig. 13-3 shows the minimum frequency control block equivalent circuit. the minimum frequency can be set by externally connec ting a resistor to the rm_fmin pin.the fig. 13-4 graph shows the minimum frequency characteristics relative to the external resistor value. fig. 13-4. minimum oscill ation frequency setting the minimum oscillation frequency decreases when the rm _fmin pin is left open or the current led from the pin decreases. ic latch operation forcibly results when the current led from the pin is detected as being continuously 1.25 ? a or less (lc_det) for 6s (2.1s 3 times). this pin voltage is equivalent to 925k ? if it is converted into a resisor value connected to the pin. connect a resisitor of 700k ? or less to the rm_fmin pin making allowance for unevenness of the ic characteristics. 1.2v rm_fmin vref i fmin 0.05 oc[3:0] cs1_ng osc i fmin ocp/zcs control logic i fmin_lc lc_det fmin frequency characteristic 0 0 100 200 300 400 20 40 60 80 100 120 140 160 180 200 freqency (rm_out) [khz] r (rm_fmin) [k ] free datasheet http:///
CXA3810M - 49 - 13-3. soft start circuit block fig. 13-5. soft start circuit block equivalent circuit fig. 13-5 shows the soft start block equivalent circuit. the soft start circuit feeds back the current, determined by the internal 2.5v output, the internal resistor (rss), and the external capacitor, to the oscillator of the resonant controller. the resistor value of rss is 400k ? in active standby mode, and 250k ? in sequence start-up mode and rapid start-up mode. in addition, the maximum frequency during soft start is limited to 4 times (max.) the minimum frequency determined by the rm_fmin pin external resistor. note that the frequency other than during soft start is not limited to 4 times the minimum frequency. in these cases the frequency is controlled according to the current led from the rm_rt pin. the fig. 13-6 grap h shows the resonant oscillation fr equency characteristics during soft start. fig. 13-6. resonant oscillation frequency during soft start 2.5v rm_ss vref 4.0v timer latch 1.0a rss oc_ng 6.0a osc oscillation frequency when soft start i (rm_rt) = 0a v (rm_ss) [v] frequency (rm_out) [khz] 0 100 200 300 400 500 600 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 fmin = 46.1khz fmin = 96.7khz fmin = 144.1khz free datasheet http:///
CXA3810M - 50 - 14. overcurrent detection circuit block fig. 14-1. overcurrent detection circuit block fig. 14 shows the resonant overcurrent detection block equivalent circuit. the voltage between the rm_cs1 and rm_cs1gnd pins is monitored, and overcurrent s in both the positive (+0.22v) and negative (-0.25v) directions are detected according to rm_outp and rm_outn pin operation. when the pfc output voltage falls (pfc_vsense < 2.143v), the overcurrent threshold voltage switch to 1.15 times normal operation both positive and negative directions. the positive threshold results +0.253v and the negative threshold results ? 0.299v. operation in overcurrent detection mode is as shown in fig. 14-2. when an overcurrent is detected, regardless of positive or negative direction, the output pulse is forcibly turned off by pulse-by-pulse control. in addition, when an overcurrent is detected, the minimum oscillation frequency is controlled to 1.2 times the setting value. thereafter, the minimum oscillation frequency limit changes in the order of 1.2 times ? 1.15 times ? 1.1 times ? 1.05 times ? 1.0 times the setting value with each dead band pulse, and control is performed to return to the original setting frequency with each pulse (4 steps). the minimum oscillation frequency is controlled to 1.2 times the setting value in this manner each time an overcurrent is detected again during the frequency limit period. in addition, in overcu rrent detection mode, the capacitor connected to the rm_ss pin is charged by approximately 5.0 ? a, and when the rm_ss pin voltage reaches 4.0v (128 ? s ? 5 times), the ic is ng latched and the output goes of f (both the rm_outp and rm_outn pins output low). (timer latch operation) approx. 1.0 ? a is constantly discharged from the rm_ss pin to the inside of the ic, so when the overcurrent is canceled partway, the rm_s s pin is discharged until the clamp voltage is reached. 0.22v 0.175v vref cs1_det (?0.26v) cs1_det (+0.22v) cs2_det (+0.175v) cs1_det gnd rm_cs2 rm_cs1 free datasheet http:///
CXA3810M - 51 - fig.14-2. operating waveform in overcurrent detection mode fig. 14-1 also shows the continuous pulse overcurrent detection (cs2_det: +0.175v detection) circuit by monitoring the voltage between the rm_cs2 ?and rm_cs2gnd.continuous overcurrent detection mode operation differs from the operation shown in fig. 14-2, and instead normal operation continues.when cs2 overcurrent detection continues for approximately 10s (set up by 2.1s ? 5 times), ng latch results and the ic forcibly stopped.when cs2 overcurrent is not detected for even one cycle during the approximately 10s count, the counter is reset. then, when an overcurrent is detected again, the 10s counter starts from zero. outp outn dbpulse resonant current ss charging period minimum resonant oscillation frequency fmin fmin 1.2 cs1 det pulse-by-pulse control positive detection +220mv negative detection ?250mv free datasheet http:///
CXA3810M - 52 - 15. resonant circuit stop voltage detection block fig. 15. rm_offadj pin inte rnal equivalent circuit fig. 15. shows the rm_offadj pin internal equivalent circuitthe rm_offadj pin is the threshold voltage setting pin to stop the resonance circuit when the pfc output voltage falls. the resonance circuit stops when the pfc_vsense pin voltage falls to the rm_offadj pin voltage or less. the stop voltage can be set by the vref devided voltage circuit by an external resistor enclosed by the red dotted line in fig. 15. note) when the pfc output voltage is set to 385v (pfc _vsense = 2.5v) and the rm_offadj pin is input 1.883v, the resonant circuit is stopped when the pfc output voltage falls to 290v or less (1ms 5 times). the rm_offadj pin has an error latch detection function t hat activates at 4.0v or more, so the ic can be forcibly set to latch operation using the secondary side overvoltage detection or other signal by externally adding the circuit enclosed by the blue dotted line in fig. 15. resonant circuit stop (1ms 3 times) timer latch signal (123s 5 times) 4v rm_offadj pfc_vsense vref external latch signal free datasheet http:///
CXA3810M - 53 - 16. ng latch operation ? pfc overvoltage latch latch operation results after pfc_ovp > 2.922v (+b > 450v) is detected and set up by 1ms ? 3 times. note) the overvoltage detection does not function when pfc_vsense > 2.922v. in addition, pfc_vsense > 2.700v (+b > 416v) overvoltage detection does not result in latch operation, and pfc output stops. ? pfc continuous overcurrent detection latch ic latch operation results when a pin abnormality such as pfc_vao pin open or pfc_tonmax pin shortcircuited to gnd occurs, and the overcurrent detection state is continuously detected due to abnormal pfc oscillation.when a pfc overvoltage is detected 4 ti mes or more per commercial half cycle during ac detection operation excepting "c" period, this is counted as one ng time. latch operation results when the 2.1s counter detects this ng state 5 consecutive times. ? pfc continuous dynamic power limit latch latch operation results when detecting consecutively the state of dynamic power limit enabled by the detection method same as the pfc continuous overcurrent detection latch. ? pfc not operating detection latch when a pin abnormality such as pfc_out pin open occurs, the ac input voltage is high, and the load is light, the pfc output voltage (+b voltage) maintains the high state, and the resonant circuit continues to operate. to avoid this phenomenon, latch operation re sults when pfc_vsense < 2.4v (+b < 370v) is continuously detected for 2.1s ? 5 times. ? resonant overcurrent timer latch when rm_cs > 0.22v or rm_cs < -0.25v is detected, the rm_ss pin is charged by a charging current of 5.0 ? a. latch operation results after rm_ss > 4.0v is detected and set up by 128 ? s ? 5 times. ? resonant continuous overcurrent latch latch operation results after rm_cs > 0.175v is detected continuously and set up by 2.1s ? 5 times. ? tsd (ic overheat) latch latch operation results after a chip temperature of approximately 140c is detected and delay time of approximately 30 ? s due to analog circuit. ? rm_offadj latch latch operation results after rm_offadj > 4.0v is detected and set up by 128 ? s ? 5 times. ? other latch latch operation results after any of the following operations are detected and set up by 2.1s ? 3 times. ? vref_ovlo detection 5.5v or more ? pfc_vao pin overcurrent detection 80 ? a or more ? pfc_zcd clamp circuit overcurrent detection +6.0ma or more, ?6.0ma or less ? pfc_vsense short-circuit detection 0.3v or less ? rm_fmin pin low current 10 ? a or less circuit operation stops after ng latch other than latch due to tsd, but the vref pin continues to output high, and the ac detection function remains enabled.in addition, the b_ok outputs low.ng latch is canceled by transitioning to standby mode.during tsd latch the vref pin outputs low, and the tsd latch state is canceled only by turning the ic power off and on again, or by detecting vcc uvlo (vcc < 9.6v). free datasheet http:///
CXA3810M - 54 - timing chart 1. pfc ? resonant controller startup sequence ? sequence start-up mode fig. 16. start-up waveform in sequence start-up mode ( * the +b voltage shows an example of setting that pfc_vsense = 2.5v when +b = 385v.) ? rapid start-up mode fig. 17. start-up waveform in rapid start-up mode ( * the +b voltage shows an example of setting that pfc_vsense = 2.5v when +b = 385v.) mode1 mode2 h h 32s 3 times 32s 3 times 8ms 6 times 1ms 5 times 8ms 6 times ic operation mode pfc_vsense (+b) 2.5v (385v) 2.143v (330v) offadj rm_ss stby sequence start-up stby mode1 mode2 h h ic operation mode pfc_vsense (+b) 2.5v (385v) 2.143v (330v) offadj rm_ss stby rapid start-up 32s 3 times 32s 3 times stby 8ms 4 times 1ms 5 times 8ms 4 times free datasheet http:///
CXA3810M - 55 - ? active standby mode fig. 18. start-up waveform in active standby mode ( * the +b voltage shows an example of setting that pfc_vsense = 2.5v when +b = 385v.) h h active stby vsense (+b) 2.5v (385v) 2.143v (330v) off_adj reg12 mode2 mode1 1.419v (220v) stby seq start-up 8ms 4 times 1ms 5 times offadj disable pfc burst range offadj enable ic operation mode 32s 3 times 32s 3times free datasheet http:///
CXA3810M - 56 - application circuit rm_outp mode2 ac_detout rm_outn b_ok vcc gnd vref rm_rt rm_cs1 rm_cs2 rm_ss mode1 pfc_out 0.47f ac_detin ac_vrms pfc_zcd pfc_cs pfc_vao pfc_vsense pfc_ovp pfc_tonmax rm_offadj rm_fmin 24 23 22 21 20 12v 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 regulator photo coupler 330k 330k 330k 330k 27k ac in 85 - 264v application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. free datasheet http:///
CXA3810M - 57 - example of representative characteristics vref output voltage vcc = 12v 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 ?30 ?5 20 45 70 95 120 vref [v] current comsumption in standby mode vcc = 12v 400 500 600 700 800 900 1000 1100 ?30 ?5 20 45 70 95 120 current comsumption in standby mode [a] vcc_uvlo hysteresis voltage 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 ?30 ?5 20 45 70 95 120 hysteresis voltage [v] temp [?c] temp [?c] vcc_uvlo opetation stop voltage 8.8 9.0 9.2 9.4 9.6 9.8 10.0 10.2 10.4 ?30 ?5 20 45 70 95 120 opetation stop voltage [v] temp [?c] temp [?c] vcc_uvlo opetation start voltage 10.0 10.4 10.8 11.2 11.6 12.0 ?30 ?5 20 45 70 95 120 opetation start voltage [v] temp [?c] current comsumption in operation mode vcc = 12v no switching 1.5 2.0 2.5 3.5 3.0 4.0 ?30 ?5 20 45 70 95 120 current comsumption in operation mode [ma] temp [?c] free datasheet http:///
CXA3810M - 58 - pfc operation start voltage 1.78 1.80 1.82 1.84 1.86 1.90 1.88 1.92 ?30 ?5 20 45 70 95 120 pfc operation start voltage [v] ac_detout output high voltage vcc = 18v 16.8 17.0 17.2 17.4 17.6 17.8 18.0 ?30 ?5 20 45 70 95 120 ac_detout output high voltage [v] pfc operation stop voltage 1.58 1.60 1.62 1.64 1.66 1.68 1.72 1.70 ?30 ?5 20 45 70 95 120 pfc operation stop voltage [v] ac_detout output low voltage vcc = 18v 0.0 0.2 0.4 0.6 0.8 1.0 1.2 ?30 ?5 20 45 70 95 120 ac_detout output low voltage [v] pfc operation hysteresis voltage 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 ?30 ?5 20 45 70 95 120 pfc operation hysteresis voltage [v] b_ok output high voltage vcc = 18v 16.8 17.0 17.2 17.4 17.6 17.8 18.0 ?30 ?5 20 45 70 95 120 b_ok output high voltage [v] temp [?c] temp [?c] temp [?c] temp [?c] temp [?c] temp [?c] free datasheet http:///
CXA3810M - 59 - b_ok output low voltage vcc = 18v 0.0 0.2 0.4 0.6 0.8 1.0 1.2 ?30 ?5 20 45 70 95 120 b_ok output low voltage [v] pfc_out output high voltage vcc = 18v 17.80 17.84 17.88 17.92 17.96 18.00 ?30 ?5 20 45 70 95 120 pfc_out output high voltage [v] pfc_out output low voltage vcc = 18v 0.00 0.02 0.04 0.06 0.08 0.10 0.12 ?30 ?5 20 45 70 95 120 pfc_out output low voltage [v] temp [?c] temp [?c] temp [?c] discharge resistance when ac off 90 110 100 130 120 140 150 160 170 ?30 ?5 20 45 70 95 120 discharge resistance when ac off [ ] temp [?c] mode1 detection high voltage 7.4 7.6 7.8 8.0 8.2 8.4 8.6 ?30 ?5 20 45 70 95 120 mode1 detection high voltage [v] temp [?c] mode1 detection low voltage 5.0 5.1 5.2 5.3 5.4 5.5 5.7 5.6 ?30 ?5 20 45 70 95 120 mode1 detection low voltage [v] temp [?c] free datasheet http:///
CXA3810M - 60 - pfc_out rise time vcc = 18v pfc_out fall time vcc = 18v 0 20 40 60 80 100 120 ?30 ?5 20 45 70 95 120 pfc_out rise time [ns] pfc_out fall time [ns] 0 20 40 60 80 100 120 ?30 ?5 20 45 70 95 120 temp [?c] temp [?c] pfc_cs blanking time 180 200 220 240 260 280 300 320 ?30 ?5 20 45 70 95 120 pfc_cs blanking time [ns] temp [?c] pfc_cs1 overcurrent detection voltage pfc_cs1 overcurrent detection voltage [v] 0.30 0.35 0.40 0.45 0.50 ?30 ?5 20 45 70 95 120 temp [?c] pfc_cs1 power limit detection voltage1 pfc_cs1 power limit detection voltage1 [v] 0.40 0.45 0.50 0.55 0.60 ?30 ?5 20 45 70 95 120 temp [?c] pfc_cs1 power limit detection voltage2 pfc_cs1 power limit detection voltage2 [v] 0.20 0.25 0.30 ?30 ?5 20 45 70 95 120 temp [?c] free datasheet http:///
CXA3810M - 61 - pfc_zcd hysteresis voltage 170 180 190 200 210 220 230 ?30 ?5 20 45 70 95 120 pfc_zcd hysteresis voltage [mv] pfc_zcd clamp high voltage 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 ?30 ?5 20 45 70 95 120 pfc_zcd clamp high voltage [v] temp [?c] temp [?c] pfc_zcd clamp low voltage 0.0 0.2 0.4 0.6 0.8 1.0 1.2 ?30 ?5 20 45 70 95 120 pfc_zcd clamp low voltage [v] temp [?c] pfc_cs1 detection delay time 80 100 120 140 160 180 220 200 ?30 ?5 20 45 70 95 120 pfc_cs1 detection delay time [ns] pfc_zcd threshold voltage 1.3v 1.15 1.20 1.25 1.30 1.35 1.40 1.45 ?30 ?5 20 45 70 95 120 pfc_zcd threshold voltage [v] temp [?c] temp [?c] pfc_zcd threshold voltage 1.5v 1.35 1.40 1.45 1.50 1.55 1.60 1.65 ?30 ?5 20 45 70 95 120 pfc_zcd threshold voltage [v] temp [?c] free datasheet http:///
CXA3810M - 62 - pfc_vao output sink current 0 5 10 15 20 25 30 ?30 ?5 20 45 70 95 120 pfc_vao output sink current [a] temp [?c] pfc_vao output source current 5 10 15 20 25 30 35 40 45 ?30 ?5 20 45 70 95 120 pfc_vao output source current [a] temp [?c] pfc_tonmax on time 24 25 26 27 28 29 30 ?30 ?5 20 45 70 95 120 pfc_tonmax on time [s] temp [?c] pfc restart timer 170 180 190 200 210 220 230 ?30 ?5 20 45 70 95 120 pfc restart timer [s] pfc resonant maximum oscillation frequency 170 190 210 230 250 270 290 310 ?30 ?5 20 45 70 95 120 pfc resonant maximum oscillation frequency [khz] temp [?c] temp [?c] pfc_vao output high clamp voltage 3.00 3.10 3.20 3.30 3.50 3.40 3.60 ?30 ?5 20 45 70 95 120 pfc_vao output high clamp voltage [v] temp [?c] free datasheet http:///
CXA3810M - 63 - pfc_vsense stop cancel voltage 2.54 2.56 2.60 2.58 2.62 2.64 2.66 ?30 ?5 20 45 70 95 120 temp [?c] pfc_vsense stop cancel voltage [v] pfc_vsense output stop voltage 2.64 2.66 2.70 2.68 2.72 2.74 2.76 ?30 ?5 20 45 70 95 120 pfc_vsense output stop voltage [v] temp [?c] pfc_tonmax on time2 5.0 5.5 6.5 6.0 7.0 7.5 8.0 ?30 ?5 20 45 70 95 120 pfc_tonmax on time2 [s] temp [?c] pfc control voltage 2.47 2.48 2.49 2.50 2.51 2.52 2.53 ?30 ?5 20 45 70 95 120 temp [?c] pfc control voltage [v] pfc_vsense overcurrent detection voltage 2.82 2.86 2.90 2.94 2.98 3.02 ?30 ?5 20 45 70 95 120 pfc_vsense overcurrent detection voltage [v] temp [?c] pfc_tonmax on time 0 5 20 15 10 30 25 40 35 50 45 23456 pfc_tonmax on time [s] vrms [v] free datasheet http:///
CXA3810M - 64 - rm_out output low voltage vcc = 18v 0.00 0.05 0.10 0.15 ?30 ?5 20 45 70 95 120 rm_out output low voltage [v] temp [?c] rm_out rise time ? vcc = 18v 0 20 40 60 80 100 120 ?30 ?5 20 45 70 95 120 rm_out rise time [ns] temp [?c] pfc_ovp overvoltage detection voltage 2.82 2.86 2.90 2.94 2.98 3.02 ?30 ?5 20 45 70 95 120 pfc_ovp overvoltage detection voltage [v] temp [?c] rm_offadj external error detection voltage 3.7 3.8 3.9 4.0 4.1 4.2 4.3 ?30 ?5 20 45 70 95 120 rm_offadj external error detection voltage [v] temp [?c] pfc_vsense resonant start voltage 2.00 2.05 2.10 2.15 2.20 2.25 2.30 ?30 ?5 20 45 70 95 120 pfc_vsense resonant start voltage [v] temp [?c] rm_out output high voltage vcc = 18v 17.85 17.90 17.95 18.00 ?30 ?5 20 45 70 95 120 rm_out output high voltage [v] temp [?c] free datasheet http:///
CXA3810M - 65 - rm_ss charge current when overcurrent 2 3 4 5 6 7 8 ?30 ?5 20 45 70 95 120 rm_ss charge current when overcurrent [a] temp [?c] rm_ss overcurrent timer latch voltage 3.7 3.9 3.8 4.0 4.1 4.3 4.2 ?30 ?5 20 45 70 95 120 rm_ss overcurrent timer latch voltage [v] temp [?c] rm_out fall time ? vcc = 18v 0 20 40 60 80 100 120 ?30 ?5 20 45 70 95 120 rm_out fall time [ns] temp [?c] rm_ss soft start end voltage 2.1 2.2 2.3 2.4 2.5 2.6 2.7 ?30 ?5 20 45 70 95 120 rm_ss soft start end voltage [v] temp [?c] rm_ss clamp voltage 2.2 2.3 2.4 2.5 2.6 2.7 2.8 ?30 ?5 20 45 70 95 120 rm_ss clamp voltage [v] rm_ss charge current 0 5 10 15 20 ?30 ?5 20 45 70 95 120 rm_ss charge current [a] temp [?c] temp [?c] free datasheet http:///
CXA3810M - 66 - rm_fmin rm_fmin minimum oscillation frequency setting 2 90 92 98 96 94 104 102 100 ?30 ?5 20 45 70 95 120 rm_fmin minimum oscillation frequency setting 2 [khz] temp [?c] rm_fmin minimum oscillation frequency setting 3 130 135 140 145 150 155 160 ?30 ?5 20 45 70 95 120 rm_fmin minimum oscillation frequency setting 3 [khz] temp [?c] rm_rt resonant maximum oscillation frequency 700 800 900 1000 1100 ?30 ?5 20 45 70 95 120 rm_rt resonant maximum oscillation frequency [khz] temp [?c] rm_rt deadband width 260 270 300 290 280 310 320 330 340 ?30 ?5 20 45 70 95 120 rm_rt deadband width [s] temp [?c] rm_rt clamp frequency magnification during soft start 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 ?30 ?5 20 45 70 95 120 rm_rt clamp frequency magnification during soft start temp [?c] rm_fmin minimum oscillation frequency setting 1 40 42 44 46 48 50 ?30 ?5 20 45 70 95 120 rm_fmin minimum oscillation frequency setting 1 [khz] temp [?c] free datasheet http:///
CXA3810M - 67 - rm_cs2 continuous overcurrent detection voltage 0.15 0.16 0.17 0.18 0.19 0.20 ?30 ?5 20 45 70 95 120 rm_cs2 continuous overcurrent detection voltage [v] temp [?c] 350 400 450 500 550 600 ?30 ?5 20 45 70 95 120 temp [?c] rm_cs1 overcurrent mask time rm_cs1 overcurrent mask time [ns] rm_cs1 positive side overcurrent detection voltage 0.20 0.21 0.22 0.23 0.24 ?30 ?5 20 45 70 95 120 rm_cs1 positive side overcurrent detection voltage [v] temp [?c] rm_cs1 rm_cs1 negative side overcurrent detection voltage rm_cs1 rm_cs1 negative side overcurrent detection voltage [v] ?30 ?5 20 45 70 95 120 temp [?c] ?0.30 ?0.22 ?0.23 ?0.24 ?0.25 ?0.26 ?0.27 ?0.28 ?0.29 rm_cs1 overcurrent detection delay time (square wave input) 80 100 120 140 160 200 180 220 ?30 ?5 20 45 70 95 120 rm_cs1 overcurrent detection delay time [ns] temp [?c] rm_cs1 overcurrent detection delay time (sine wave input: 90khz) reference data (design assurance) 100 150 200 250 300 350 400 ?30 ?5 20 45 70 95 120 rm_cs1 overcurrent detection delay time [ns] temp [?c] free datasheet http:///
CXA3810M - 68 - rm_cs qhhugvewttgpv 6 7 8 9 10 11 12 13 ?30 ?5 20 45 70 95 120 rm_cs qhhugvewttgpv [a] ouenqem 960 980 1000 1020 1040 1060 1080 1100 ?30 ?5 20 45 70 95 120 1ms clock [s] temp [?c] temp [?c] free datasheet http:///
CXA3810M - 69 - package outline (unit : mm) sdt: 875336310 sony code eiaj code jedec code m package structure molding compound lead treatment lead material package mass epoxy resin solder plating 42/copper alloy 24pin sop (plastic) 15.0 ? 0.1 + 0.4 1 12 13 24 0.45 0.1 + 0.3 0.24 sop-24p-l01 sop024-p-0300 0.3g 1.27 6.9 0.2 ? 0.05 + 0.1 0.1 ? 0.05 + 0.2 1.85 ? 0.15 + 0.4 7.9 0.4 0.15 0.5 0.2 5.3 ? 0.1 free datasheet http:///
CXA3810M - 70 - sony corporation aoi: 875337210 free datasheet http:///

▲Up To Search▲

Price & Availability of CXA3810M

	To Download CXA3810M Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .