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unisonic technologies co., ltd ups602 linear integrated circuit www.unisonic.com.tw 1 of 12 copyright ? 2006 unisonic technologies co., ltd qw-r119-005,a high performance current mode power switch description the utc ups602 is designed to provide several special enhancements to satisfy the needs: power-saving mode for low standby power, over current pr otection (ocp), over voltage protection (ovp), over load protection (olp), uvlo, over temperature protection (otp) etc protection features. ic will be shutdown when either protecti on arise and can auto-restart. features * low startup current 20ua typ * fixed switching frequency(norm is 70khz) * max duty cycle 70% * power-saving mode for low power * over temperature protection * overload protection * over voltage protection * leading edge blanking * soft start dip-8 *pb-free plating product number: ups602l ordering information order number normal lead free plating package packing UPS602-D08-T ups602l-d08-t dip-8 tube ups602l-d08-t (1)packing type (2)package type (3)lead plating (1) t: tube (2) d08: dip-8 (3) l: lead free plating, blank: pb/sn
ups602 linear integrated circuit unisonic technologies co., ltd 2 of 12 www.unisonic.com.tw qw-r119-005,a pin configuration gnd fb v cc drain nc cs ss drain 1 2 3 4 8 7 6 5 pin description pin symbol function 1 drain power mosfet drain 2 nc 3 v cc supply voltage 4 gnd ground 5 ss soft-start 6 fb feedback 7 cs controller current sense input 8 drain power mosfet drain
ups602 linear integrated circuit unisonic technologies co., ltd 3 of 12 www.unisonic.com.tw qw-r119-005,a block diagram v cc ss fb gnd drain latch oscillator s rq q driver current limiting pwm comp soft start power-saving unit ovp olp otp uvlo reference voltage cs nc 2 3 5 6 4 7 8 leb 1 drain explain:olp(over load protection) ovp(over voltage protection) otp(over temperature protection) uvlo(under voltage latch-out leb(led edge blanking) ss(soft start)
ups602 linear integrated circuit unisonic technologies co., ltd 4 of 12 www.unisonic.com.tw qw-r119-005,a absolute maximum ratings (ta " 25c, v cc =15v, r t =75k ? , unless otherwise specified) parameter symbol ratings unit supply voltage v cc 26 v input voltage to fb pin v fb -0.3 ~ 6.2 v input voltage to cs pin v cs -0.3 ~ 2.8 v input voltage to rt pin v rt -0.3 ~ 6.2 v junction temperature t j +150 c operating temperature t opr -40 ~ +125 c storage temperature t stg -50 ~ +150 c note absolute maximum ratings are those val ues beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings onl y and functional device operat ion is not implied. operating range parameter symbol ratings unit supply voltage v cc 8.6 ~ 22 v electrical characteristics (ta " 25c, v cc =15v, r t =75k ? , unless otherwise specified) parameter symbol test conditions min typ max unit supply section start up current i str v cc =13.5 22 45 a off i off v ss = 0, i fb = 0 3.7 5.5 ma supply current with switch on i on v ss = 5v, i fb = 0 4.0 6.0 ma under-voltage lockout section start threshold voltage v thd(on) 11.8 12.6 13.4 v min. operating voltage v cc(min) 7.6 8.1 8.6 v hysteresis v cc(hy) 4.5 v internal voltage reference reference voltage v ref measured at pin v fb 6.1 6.3 6.5 v control section normal v fb = 4v 61 68 75 khz switch frequency power-saving f (sw) v fb = 1v 18 20 23 khz max d max 65 70 75 % duty cycle min d min v fb < 0.5v 0 % min v min 0.5 v v fb operating level max v max 4.4 v feedback resistor r fb 2.6 3.8 5.0 k ? c ss =0.05uf 6 ms c ss =0.1uf 12 ms soft-start time t ss c ss =1uf 120 ms protection section ovp threshold v (ovp) v ss < 3.5v, v fb > 5v 15.2 16 16.8 v olp threshold v fb(olp) v ss > 5.4v 4.4 4.6 4.9 v otp threshold t (thr) 120 135 150 c ovp disable threshold v ss(deact) v fb > 5v, v cc > 17v 3.7 3.9 4.2 v olp enable threshold v ss(act) v fb > 5v 4.9 5.1 5.4 v spike blanking time t sb 6.8 s current limiting section leb t leb 220 ns power mos-transistor section drain-source breakdown voltage v dss 600 v static drain-source on-state resistance r ds(on) 5 ? output capacitance c o 56 pf
ups602 linear integrated circuit unisonic technologies co., ltd 5 of 12 www.unisonic.com.tw qw-r119-005,a electrical characteristics(cont.) parameter symbol test conditions min typ max unit rise time t r 21 ns fall time t f 24 ns turn-off delay time t d(off) 30 ns drain-source diode continuous source current i s 2 a
ups602 linear integrated circuit unisonic technologies co., ltd 6 of 12 www.unisonic.com.tw qw-r119-005,a functional description the internal reference voltages and bias circuit work at v cc >12.6v, and shutdown at v cc < 8.1v. (1) soft-start when every ic power on, driver output duty cycle will be decided by voltage v ss on soft-start capacitor and v cs on current sense resistor at beginning. after v ss reach 5.1v, the whole soft-sta rt phase end, and driver duty cycle depend on v fb and v cs . the relation among v ss , v fb and v out as followed fig.3, here soft-start phase t soft-start should more than v out start-up phase t start-up , otherwise, ic will enter false olp protection state. because after the soft-start phase end, if v out remain in lower voltage, v fb more than 4.6v, then ic enter false olp state. furthermore, soft-start phase should end before v cc reach v cc(min) during v cc power on. otherwise, if soft-start phase remain not end before v cc reach v cc(min) during v cc power on, ic will enter auto -restart phase and not set up v out . finally soft-start also set ovp active phase. ovp active phase between v ss =0 and v ss =3.8v, ovp will not be sensed after v ss reach 3.8v.the soft-start phase t ss 6 ms (c ss =0.05uf) t ss = 12 ms (c ss =0.1uf) 120 ms (c ss =1uf) t v out v fb t t driver 4.6v t strat-up v ss t 5.1v t soft -start fig.3 soft-start phase
ups602 linear integrated circuit unisonic technologies co., ltd 7 of 12 www.unisonic.com.tw qw-r119-005,a functional description(cont.) (2) switch frequency set the maximum switch frequency decided by an external resistor r t connected between pin r t and ground. then the maximum switch frequency will depend on user requirement. the relation curve between f sw and r t as followed fig.5 under the condition of p out /p outmax =50%. the equation between f sw and r t as followed (1-2): f sw = -0.61*r t +115.7--------------------------(1-2) after r t connected, switch frequency is also modulated by output power p out during ic operating. so lower switch frequency at lower load, which more and more improve ic?s efficiency at light load. switch frequency is decreased minimum at no load, then the ups602 will operate at po wer-saving mode for lower standby power. the relation curve between f sw and p out /p outmax as followed fig.4 under the condition of r t =75k ? . 60 10 70 80 50 40 30 20 10 1% 2% 3% 6% 8% 09%10% p out /p outmax (r t =75k ? ) fsw (khz) 220v 110v 90 5% 4% 7% fig.4 the relation curve between f sw and relative output power p out /p outmax fsw (khz) 60 20 10 55 60 65 70 75 80 85 90 rt (k $ ) (p out /p outmax =50%) 70 80 50 40 30 95 90 100 fig.5 the relation curve between f sw and r t
ups602 linear integrated circuit unisonic technologies co., ltd 8 of 12 www.unisonic.com.tw qw-r119-005,a functional description(cont.) (3) protection section ups602 takes on more protection functions such as olp, ovp and otp etc. in case of those failure modes for continual 7.2s (blanking time), t he driver is shut down. at the sa me time, ic enters auto-restart, v cc power on and driver is reset after v cc power on again. olp after soft-start phase end (v ss >5.1v), ic will shutdown driver if over load state occurs (corresponding to v fb >4.6v) for continual 7.2s. olp function will not inactive during soft-start phase. olp case as followed fig. 6. the test circuit as followed fig.8 for ups602. v cc v out v fb v ss t t t t 5.1v 4.6v 8.1v 12.6v 7.2 s blanking 7.2 s blanking ss phase v cc driver on/off v fb v ss t t t t 5.1v 4.6v 8.1v 12.6v 7.2 s blanking 7.2 s blanking ss phase t restart 16v 3.9v ovp phase fig.6 olp case fig.7 ovp case ovp power supply v cc ?s ovp function are enabled only when v ss <3.9 & v fb >4.6v during soft-start phase. during above condition, driver will be shutdo wn if over voltage state occurs (v cc >16v) for continual 7.2s. ovp function will not inactive after soft-start phase. olp case as followed fig.7. the test circuit as followed fig.9 for ups602. otp otp will shut down driver when junction temperature t j of internal circuits is more than threshold 135c for continual 7.2s.
ups602 linear integrated circuit unisonic technologies co., ltd 9 of 12 www.unisonic.com.tw qw-r119-005,a functional description(cont.) c4 2 1 3 4 7 8 6 5 c13 ups602 r cs ic3 v cc 15v fig.8 olp test circuit fig.9 ovp test circuit v fb 20ms 4.6v v fb 5.5v driver v cs c4 2 1 3 4 7 8 6 5 c13 r cs ic3 v cc 15v 15 s 16v v cc 3v driver v cs ups602 (4) driver output section rise edge time of driver output is about 200ns for avoiding low emi. (6) inside power switch mos transistor for ups602, it?s inside power mos transistor may load source current 2a. specific power mos transistor parameter is as ?power mos transistor secti on? in electrical characteristics table.
ups602 linear integrated circuit unisonic technologies co., ltd 10 of 12 www.unisonic.com.tw qw-r119-005,a typical application circuit r5 + + + + c3 c4 c5 r4 r2 r3 d2 ic1 r8 r9 r11 r12 gnd 5v 2a zd1 r7 d3 c6 r6 c7 c8 c9 r10 ic2 tr 1 d1 c1 r1 c2 1a/600v bd1 nf1 f1 cx1 ac in cy1 5v = 3.5a 12v =1.5a 8 7 6 5 1 2 3 4 l1 ic3 fig.10 ups602 typical application circuit table1. components reference descrip tion for ups602 application circuit cx 0.1uf/250v r1 100k ? 1/2w d1 fr107 c1 33uf/400v r2 2.2m ? 1/8w d2 1n4148 c2 103/1kv r3 10 ? 1/8w d3 c83-004 c3 22uf/250v r4 0.22 ? 1/4w ic1 pc817c c4 104/50v r6 10 ? 1/8w ic2 utc431 c5 104/50v r7 1k ? 1/8w cy1 222/250v c6 102/100v r8 150 ? 1/8w tr1 ef25 or ee25 c7 680uf/16v r9 3.3k ? 1/8w l1 5uh c8 680uf/16v r10 1k ? 1/8w zd1 6.2v1w c9 104/50v r11 3.3k ? 1/8w nf1 uu10.5 r12 47k ? 1/8w f1 2a/250v ic3 ups602 bd1 1a/600v
ups602 linear integrated circuit unisonic technologies co., ltd 11 of 12 www.unisonic.com.tw qw-r119-005,a typical characteristics(cont.) 120mv 3.86v 1.64khz 850 hz ch1 max 6.00v ch1 min 460 mv ch1 frequency 785 .5 hz m 400 0 sa ch1 ? 3.18v 1.00v ch1 60.0 mv 3.30 v 3.29khz 1.70khz ch1 max 5.90v ch1 min 40.0mv ch1 frequency 1.906khz m 200 0 s a ch1 ? 2.68 v 1.00 v ch1 fig 1. feedback voltage during loadjump from 10% up to 100% load (v dcin =120v) fig 2. feedback voltage during loadjump from 10% up to 100% load (v dcin =350v) 12.3v 12.3v ch1 max 5.04v ch1 min 1.32v ch1 frequency ----- hz m 10.0ms a ch1 ? 3.16v 2.00v ch1 fig 3. startup with full load condition at v dcin =120v, vc4 and vout v c4 v out 5.00v ch2 12.3v 12.3v ch1 max 5.04v ch1 min -120 mv ch1 frequency ----- hz m 10.0ms a ch1 ? 3.16v 2.00v ch1 fig 4. startup with full load condition at v dcin =350v, vc4 and vout v c4 v out 5.00v ch2 120mv 12.3v m 4 .00 ms a ch3 ? 4.96v 2.00v ch1 fig 5. startup behavior at nominal load condition v dci n =120v v c4 v ss 2.00v ch2 2.00v ch3 357hz 21.2hz v fb 240 mv 12.0v m 4.00ms a ch3 ? 4.96v 2.00 v ch1 fig 6. startup behavior at nominal load condition v dcin =350v v c4 v ss 2.00v ch2 2.00 v ch3 1.79khz 147 hz v fb
ups602 linear integrated circuit unisonic technologies co., ltd 12 of 12 www.unisonic.com.tw qw-r119-005,a typical characteristics(cont.) fig 8. no load input power vs. line voltage (normal mode) 0 0. 1 0. 2 0. 3 0.4 0. 5 0. 6 0. 7 0. 8 0.9 1.0 100 150 200 250 300 dc input voltage(v) input power (w) 350 400 input power no load (po ut =0w) fig 7. frequency vs. output power 0 20 40 60 80 100 120 02468101214161820 output power(w) frequency(khz) v dcin =120v utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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