chopper regulators PQ1CZ1 PQ1CZ1 surface mount type chopper regulator features surface mount type package (equivalent to sc-63, 5-terminal type) variable output voltage (v ref to 35v/ v ref to 30v) built-in on/off control function built-in overheat protection function and overcurrent protection function built-in soft start function applications personal computers word processors printers car audio equipment parameter symbol rating unit v in v adj v i - o i sw v out v c p d t j t opr t stg t sol 40 7 41 1.5 1 0.3 to 40 8 150 20 to +80 40 to +150 260(for 10s) v v v a v v w ? c ? c ? c ? c input voltage error input voltage input-output voltage switching current voltage between output and com on/off control voltage power dissipation junction temperature operating temperature storage temperature soldering temperature ? 1 ? 2 ? 3 ? 4 ? 1 voltage between v in terminal and com terminal. ? 2 voltage between v out terminal and com terminal. ? 3 voltage between vc terminal and com terminal. ? 4 with infinite heat sink, refer to fig.1 absolute maximum ratings (t a =25 ? c) outline dimensions (unit : mm) please refer to the chapter " handling precautions ". 1cz1 6.6max 9.7max 2.5min 5.2 0.5 2.3 0.5 0.5 +0.2 0.1 5.5 0.5 4 (1.27) (0.5) (0.5) (0.9) (1.7) v in v out com(equivalent to heat sink) o adj v c ( ):typical values 1 1 2 2 3 3 4 4 5 5 3 notice in the absence of confirmation by device specification sheets,sharp takes no responsibility for any defects that may occur in equipment using any sharp devices shown in catalogs,data books,etc.contact sharp in order to obtain the latest device specification sheets before using any sharp device. internet internet address for electronic components group http://sharp-world.com/ecg/
chopper regulators PQ1CZ1 parameter symbol conditions v sat v ref ? v ref |r eg l| |r eg i| fo ? fo d max i l i chg v thl v thh v th(on) i sd i qs unitmax.typ.min. 1.235 80 90 1.55 15 1.95 3.25 1.05 io=1a, no l,d,c o t j =0 to 125 ? c i o =0.2 to 1a v in =8 to 35v i o =1a t j =0 to 125 ? c terminal = open no l,d,c o , terminals are open duty=0%, terminal =ov, terminal duty=d max , terminal is open., terminal terminal=0v , terminal v in =40v, terminal =0v v in =40v, terminal =3v 0.9 1.26 0.5 0.1 0.5 82 100 2 2 10 2.25 3.55 1.4 150 8 1.5 1.285 1.5 2.5 120 2.6 5 2.55 3.85 1.75 400 12 electrical characteristics ( unless otherwise specified, condition shall be v in =12v, io=0.2a, vo=5v, terminal is open, t a =25 ? c) v v % % % % khz % % a a v v a ma output saturation voltage reference voltage reference voltage temperature fluctuation load regulation line regulation efficiency oscillation frequency oscillation frequency temperature fluctuation maximum duty overcurrent detecting level charge current input threshold voltage on threshold voltage stand-by current output off-state dissipation current 5 2 4 4 4 4 4 4 5 5 5 5 fig. 1 test circuit v in i sd i qs i chg c in 100 f c o 470 f d r 1 1k ? r 2 i o v o ++ a a l 210 h 2.2 n f road l : hk-hk-14d100-2110(made by toho co.) d : erc80-004(made by fuji electronics co.) [v o ]=v ref 1+ v r 2 r 1 output voltage 1 2 3 4 5 fig. 2 power dissipation vs. ambient temperature note) oblique line portion : overheat protection may operate in this area. fig. 3 overcurrent protection characteristics (typical value) 0 0.5 1.51 3.52.5 3 24 5 4 7 6 2 3 1 0 output voltage vo (v) output current io (a) t j =25 ? c v in =12v vo=5v c in =100 f co=470 f l=210 h ambient temperature t a ( ? c) power dissipation p d (w) p d : with infinite heat sink 20 0 0 5 10 20 40 60 80 100 p d
chopper regulators PQ1CZ1 fig. 4 efficiency vs. input voltage input voltage v in (v) efficiency (%) 0 50 60 70 80 90 100 2010 30 40 t j =25 ? c v o =12v, i o =1.0a v o =12v, i o =0.2a v o =5v, i o =0.2a v o =5v, i o =1.0a fig. 5 switching current vs. output saturation voltage t j =25 ? c output saturation voltage v sat (v) switching current i sw (a) 0 0.5 1.0 1.5 0 0.5 1.0 1.5 2.0 fig. 6 stand-by current vs. input voltage t j =25 ? c input voltage v in (v) stand-by current i sd ( a) 0 0 100 50 150 200 10 5 152535 20 30 40 fig. 7 reference voltage fluctuation vs. junction temperature 25 0 2 5 50 75 100 125 2 0 1 1 2 junction temperature t j ( ? c) v in =12v vo=5v reference voltage fluctuation ? v ref (%) fig. 8 load regulation vs. output current 0 0.2 0.4 0.6 0.8 1 0.5 1 0.5 0 t j =25 ? c v in =12v vo=5v c in =100 f c o =470 f l=210 h load regulation r eg l (%) output current i o (a) fig. 9 line regulation vs. input voltage 0102030 5 15253540 0.5 1 0.5 0 t j =25 ? c, io=0.2a vo=5v, c in =100 f c o =470 f, l=210 h line regulation r eg i (%) input voltage v in (v)
chopper regulators PQ1CZ1 fig.10 oscillation frequency fluctuation vs. junction temperature 25 0 2 5 50 75 100 125 5 1 1 3 5 2 0 4 4 2 3 v in =12v vo=5v junction temperature t j ( ? c) oscillation frequency fluctuation (%) fig.11 overcurrent detecting level fluctuation vs. junction temperature 25 0 2 5 5 0 7 5 100 125 15 5 10 5 15 0 10 junction temperature t j ( ? c) overcurrent detecting level fluctation (%) fig.12 threshold voltage vs. junction temperature 50 0.5 2 4 3.5 3 2.5 1 1.5 4.5 v thh v thl v in =12v v th(on) 25 0 5025 10075 125 junction temperature t j ( ? c) threshold voltage v th(on), v thl, v thh (v) fig.13 operating dissipation current vs. input voltage 0 5 7 10 9 8 6 10 20 30 40 io=0.2a io=1a no load t j =25 ? c vo=5v input voltage v in (v) operating dissipation current i q ' (ma) fig.14 power dissipation vs. ambient temperature (typical value) pwb material : glass-cloth epoxy resin size : 50 x 50 x 1.6mm cu thickness : 35 m pwb cu cu area 740mm 2 cu area 180mm 2 cu area 100mm 2 cu area 70mm 2 cu area 36mm 2 ambient temperature t a ( ? c) power dissipation p d (w) 20 0 0 1 2 3 20 40 60 80 100
chopper regulators PQ1CZ1 block diagram step down type circuit diagram (5v output) polarity inversion type circuit diagram ( 5v output) v in 8~35v c in 100 f load c s r s c o 470 f v o =5v r s <=50k ? on/off control signal + d r 1 1k ? r 2 3k ? l 210 h + PQ1CZ1 1 2 3 4 5 v in 5 to 30v c in 100 f load c s r s c o 2200 f v o = 5vr s <=50k ? on/off control signal + d r 1 1k ? r 2 3k ? l 130 h + PQ1CZ1 1 2 3 4 5 voltage regulator on/off circuit v in v out on/off o adj com over current detecting circuit over current detecting circuit f/f pwm comp error amp. v ref q r s + soft start oscillation + 1 2 3 4 5
chopper regulators PQ1CZ1 thermal protection design external connection + v in c in c s c o v o r 2 r 1 load d 12 4 3 5 l + q wiring condition is very important. noise associated with wiring inductance may cause problems. for minimizing inductance, it is recommended to design the thick and short pattern (between large current diodos, input/ output capacitors, and terminal 1,2.)single-point grounding(as indicated)should be used for best results. w when output voltage is not stable, it can be improved by attaching capacitor(from several nf to several dozens nf)to external resistor r 2 . e high switching speed and low forward voltage type schottky barrier diode should be recommended for the catch-diode d because it affects the efficiency. please select the diode which the current rating is at least 1.2 times greater than maximum swiching current. r the output ripple voltage is highly influenced by esr(equivalent series resistor)of output capacitor, and can be minimized by selecting low esr capacitor. t an inductor should not be operated beyond its maximum rated current so that it may not saturate. internal power dissipation(p)of device is generally obtained by the following equation. when ambient temperature ta and power dissipation p d (max)during operation are determined, use cu plate which allows the element to operate within the safety operation area specified by the derating curve. insufficient radiation gives an unfavorab le influence to the normal operation and reliability of the device. p=i sw (average.) x v sat xd' + v in (voltage between v in to com terminal) x i q '(consumption current) step down type d'(duty)= = i sw (average)= i o (output current.) t on t(period) v o +v f v in v sat +v f polarity inversion type d'(duty)= = i sw (average)= x i o (output current.) t on t(period) 1 1 d' |v o |+v f v in +|v o | v sat +v f v f : forward voltage of the diode
chopper regulators PQ1CZ1 on/off control terminal (v) 3.55 (v thh ) 2.25 (v thl ) 1.4 (v thon ) 0 stand-by mode off-state soft start time duty 0% duty d max step down voltage circuit on/off terminal voltage 1 2 3 1 2 3 in the following circuit,when on/off control terminal t becomes low by switching transistor tr on, output voltage may be turned off and the device becomes stand-by mode. dissipation current at stand-by mode becomes max.400 a. when capacitor cs is attached, output pulse gradually expanded and output voltage will start softly. for on/off control with capacitor c s , be careful not to destroy a transistor tr by discharge current from c s , adding a resistor restricting discharge current of c s . + v in c in c s c o v o r 2 r 1 load d 12 4 3 5 li o + t r on/off control signal in the external area of the safety operation area shown by the derating curve, the overheat protection circuit may operate to shut-down output. however, please avoid keeping such condition for a long time.
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