unisonic technologies co., ltd s3525 cmos ic www.unisonic.com.tw 1 of 9 copyright ? 2010 unisonic technologies co., ltd qw-r502-105.b pc power supply supervisor ? description the utc s3525 is specially designed for switching power supply system. it provides protection circuits, power good output (pgo) indicator, fault protection out put (fpob) and a psonb control. the protection circuits include over voltage protection (ovp), under voltage protection (uvp) and over current protection (ocp) monitoring for system voltages and currents. when 3.3v, 5v or 12v voltage is decreasing to 2.68v, 4.3v and 9.9v respectively, the under volt age protection (uvp) function will be enabled. fpob will be set to high to turn off the pwm controller ic. toggling the psonb from low to high will reset the fault protection latch. the voltage difference across external current shunt is used for ocp functions. an external resistor can be used to adjust protection threshold. the power supply is turned on after 38ms delay time when psonb signal is set from high to low. to turn off power supply, psonb signal is set from low to high with the delay time 38ms. the pgi circuitry provides a power-down warning signal for pgo. when pgi input is lower than the intern al 1.20v reference voltage, pgo signal is pulled low. ? features * ovp/uvp monitors 3.3v, 5v, 12v input voltage level. * ocp monitors i s33 , i s5 , i s12 input current sense. * fault protection output (fpob) with open drain output stage. * power good output (pgo) with open drain output stage. * 38ms de-bounce time for psonb input signal. * 300ms time delay from pgi to pgo. * 2.4ms time delay for pso nb to turn off fpob. ? ordering information ordering number lead free plating halogen free package packing s3525l-d14-t s3525g-d14-t dip-14 tube s3525l-s14-r S3525G-S14-R sop-14 tape reel s3525l-s14-t s3525g-s14-t sop-14 tube
s3525 cmos ic unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r502-105.b ? pin assignment ? function description pgi psonb uv&oc protection ov protection fpob pgo pgi<1.2v l no no l l pgi<1.2v l no yes h l pgi<1.2v l yes no l l pgi<1.2v l yes yes h l pgi>1.2v l no no l h pgi>1.2v l no yes h l pgi>1.2v l yes no h l pgi>1.2v l yes yes h l x h x x h l note: fpob=l means: fault is not latched. fpob=h means: fault is latched pgo=l means: fault. pgo=h means: no fault x=do not care ? pin descriptions pin no. pin name type description 1 pgi input power good input. for atx smps, it detects ac line voltage through the main transformer. 2 gnd supply ground 3 fpob output fault protection output. output signal to control the primary pwm ic through an opto-coupler. when fpob is low, the pwm ic is enabled. 4 psonb input remote on/off logic input from cpu or main-board. the power supply will be turned on/off after 38ms delay. 5 i s12ab input 12v ab over current protection. 6 ri input reference setting. one external resi stor ri connected between ri and gnd pin will determine a reference current, i ref = 1.20/ri, for ocp programming. 7 v 12b input 12v over/under voltage protection. 8 i s5 input 5v over current protection. 9 i s33 input 3.3v over current protection 10 v 12a input 12v over/under voltage protection. 11 v 33 input 3.3v over/under voltage protection 12 v 5 input 5v over/under voltage protection. 13 v dd supply power supply. 14 pgo output power good logic output, 0 or 1(open-dr ain). power good=1 means that the power supply is good for operation. the power good delay is 300ms.
s3525 cmos ic unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r502-105.b ? block diagram + - pgi un bandgap reference v ref =1.2v + - i s33 v s33 + - ov v 12a i ref *8 + - un i s12ab + - v 12a i ref *8 + - ov + - un v s12a + - v 12a + - un + - ov v s12b i s5 + - i ref *8 v 12a + - ov + - un v s5 75ms/ 300ms delay 73 s debounce 73 s debounce clr 225ms delay pgo v cc fpob r sq q 2.4ms delay 38 ms debounce power on reset pwr psonb internal power v cci =3.6 v + - v ref =1.2v v 12a r i osc pwr clk
s3525 cmos ic unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r502-105.b ? absolute maximum ratings parameter symbol ratings unit supply voltage, v dd , v 12a -0.3 ~ 16 v v 5 ,v 33 , psonb, i s5 , i s33 -0.3 ~ 7 v i s12ab , v 12b -0.3 ~ 16 v input voltage pgi v in -0.3 ~ v dd +0.3 v fpob -0.3 ~ 7 v output voltage pgo v out -0.3 ~ 7 v operating temperature t opr -40 ~ +125 c storage temperature t stg -55 ~ +150 c note absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? recommended operating conditions parameter symbol min typ max unit supply voltage v dd v dd 4 12 15 v supply voltage v cc2 9.5 12 15 v v 5 ,v 33 ,pgi ,psonb 7 v input voltage v 12a , v 12b v in 15 v fpob 7 v output voltage pgo v out 7 v fpob 30 ma output sink current pgo i o(sink) 10 ma ri output current i o(ri) 10 65 ua supply voltage rising time (v dd ) t r 1 ms ? electrical characteristics (ta=25c and v dd =5v and v 12a =12v) parameter symbol test conditions min typ max unit over voltage detection v 12a, v 12b 13.2 13.8 14.4 v v 5 5.7 6.1 6.5 v over voltage threshold v 33 3.7 3.9 4.1 v i sink =10ma 0.3 low level output voltage (fpob) v ol i sink =30ma 0.7 v output leakage current (fpob) i leak v (fpob) =5v 5 ua psonb high-level input voltage v ih 2 v low-level input voltage v il 0.8 v input pull-up current i in psonb=0v 120 ua pgi and pgo v 12a, v 12b 9.5 10 10.5 v v 5 4.1 4.30 4.47 v under voltage threshold v 33 2.55 2.69 2.83 v input threshold voltage (pgi) v i(thd) 1.16 1.20 1.24 v low level output voltage (pgo) v ol i sink =10ma 0.4 v output leakage current (pgo) i leak pgo=5v 5 ua
s3525 cmos ic unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r502-105.b ? electrical characteristics (cont.) parameter symbol test conditions min typ max unit switching characteristics psonb on(psonb low to fpob low) t (psonb on) v dd =5v 32 38 62 ms psonb off(psonb hi to pgo low) t (psonb off) v dd =5v 32 38 62 ms pgi to pgo delay time t pg v dd =5v 200 300 490 ms timing pgo low to fpob high t psoff v dd =5v 2.0 2.4 4 ms t uvp1 fpob=low & pgi > 1.2v 65 75 122 ms uvd/ocd turn on delay time t uvp2 fpob=low & pgi < 1.2v 260 300 488 ms noise deglitch time t g1 63 75 120 s noise deglitch time for latch t g2 63 75 120 s total device low voltage v dd 3.0 v supply current i dd psonb=5v 1 ma
s3525 cmos ic unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r502-105.b ? application information
s3525 cmos ic unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r502-105.b ? application information
s3525 cmos ic unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r502-105.b ? typical timming diagram 1) pgi (under-voltage): 2) v 33, v 5, v 12a, v 12b (under-voltage) or i s33, i s5, i s12ab (over-current): psonb fpob pgo v 33 /v 5 /v 12 i s33 /i s5 /i s12 t pg + t g1 t uvp2 + t g2 t uvp2 = 300ms pgi t (psonb on) t (psonb on) t psoff t (psonb off)
s3525 cmos ic unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r502-105.b ? typical timming diagram(cont.) 3) v 33, v 5, v 12a, v 12b (over-voltage). 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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