unisonic technologies co., ltd s3515 cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2010 unisonic technologies co., ltd qw-r502-073,b pc power supply supervisors ? description the utc s3515 is specially designed for switching power supply system. it provides over-voltage protection, over-current protection, under-voltage protection, on/off control and power good signal generating. ovp/uvp (over/under-voltage protection) monitors 3.3v, 5v and double 12v to protect our power supply and pc, fpo goes to high when one of these supply voltages exceeds their normal operation voltage range. ocp (over current protection) monitors is33, is5, is12 input current. the voltage difference across external current shunt is used for ocp functions. an external resistor which is connected between the ri pin and the gnd pin can be used to adjust protection threshold. to achieve better immunity for lighting surge glitch and to prevent accidental power shut down during dynamic loading condition, the de-bounce time for uvp/ocp is 73us respectively. the deglitch time for ovp is 73us for better noise immunity. the power supply is turned on after 38ms de-bounce time when pson signal is set from high to low. to turn off power supply, pson signal is set from low to high and the de-bounce time is 115ms. when pgi input voltage level is lower than the internal 1.15v reference voltage, after 73us de-bounce time, the pgo signal is pulled low. ? features * over/under-voltage protection for 3.3v, 5v, and two 12v * over-current protection for 3.3v, 5v, and two 12v * pgo and fpo pins with open drain output stage * 300ms power good delay from pgi to pgo * 75ms delay for 3.3v, 5v and 12v power turn on * 2.8ms delay for pson control to fpo turn off * 38ms / 115ms pson on/off de-bounce time * 73us width noise deglitches * 73us de-bounce time for uvp and ocp * wide supply voltage range dip-14 sop-14 ? ordering information ordering number lead free plating halogen free package packing s3515l-d14-t s3515g-d14-t dip-14 tube s3515l-s14-r S3515G-S14-R sop-14 tape reel s3515l-s14-t s3515g-s14-t sop-14 tube
s3515 cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r502-073,b ? pin configuration 1 2 3 4 5 6 78 9 10 11 12 13 14 pgo v dd v s5 v s33 v s12 i s33 i s5 pgi gnd fpo pson i s12 ri v s12b ? pin description pin no pin name type description 1 pgi input power good input. 3 fpo output fault protection output, open drain output stage. 4 pson input power on/off control signal sends from cpu or main-board. the power supply will be turned on/off after 38ms/115ms respectively. 8 i s5 input 5v over current protection. 9 i s33 input 3.3v over current protection. 5 i s12 input 12v over current protection. regardi ng typical application, this pin is connected to the positiv e end of a current shunt through one resistor. when the voltage on is12 is higher than that of vs12 by 5mv, ocp will be enabled. one current sink, 8 x i ref , is used to determine the voltage drop between the positive end of the current shunt and vs12. adjusting the value of the external resistor can adjust the threshold for ocp accordingly. the operation for is5 or is33 is the same. 6 ri input current sense setting. an external resistor ri is connected between ri pin and gnd pin will adjust a reference current, i ref = 1.15/ri, for ocp function. 12 v s5 input 5v over/under-voltage protection. 7 v s12b input second 12v over/under-voltage protection. 10 v s12 input 12v over/under-voltage protection. 11 v s33 input 3.3v over/und er-voltage protection. 13 v dd power supply voltage. 4v ~ 15v. 14 pgo output power good logic output, open drain output stage. the power good delay is 300ms from pgi to pgo. 2 gnd power ground.
s3515 cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r502-073,b ? block diagram ov + - un + - ov + - un + - ov + - un + - ov + - un + - v ref + - + - + - + - + - i s 33 i s 12 i s 5 pgi v s12 b v s 12a v s 5 v s 33 pson fpo pgo v ref =1.15 v bandgap reference i ref 8 v 12a v 12a v 12a i ref 8 i ref 8 v 12a pwr 38ms /115ms debounce rst power on reset clr 2.4 ms delay clr 75ms delay rst r sq 73s debounce rst clr 300ms delay pwr i ref =v ref /r i + - v ref =1.15 v r i un 73s debounce
s3515 cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r502-073,b ? absolute maximum rating parameter symbol ratings unit dc supply voltage v dd -0.3 ~ 16 v input voltage (pson, v s33 , v s5 , pgi) v in -0.3 ~ 8 v -0.3 ~ 16 output voltage (fpo) v out -0.3 ~ 8 v power dissipation (pgo) p d 400 mw operating temperature t opr -40 ~ +85 c storage temperature t stg -55 ~ +150 c note 1. 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. 2. stresses above those listed may caus e permanent damage to the device. ? recommended operating conditions parameter symbol ratings unit dc supply voltage v dd 4 ~ 15 v input voltage (pson, v s33 , v s5 , i s33 , i s5 , pgi) 7 input voltage (v s12 ,v s12b , i s12 ) v in 15 v fpo 15 output voltage pgo v out 7 v fpo 20 output sink current pgo i o(sink) 10 ma supply voltage rising time (note) t r 1 ms output current ri i ri 12.5 ~ 62.5 a note v dd rising and falling slew rate must be less than 14v/ms. ? electrical characteristics (v dd =12v, t a =25c) parameter symbol test conditions min typ max unit under-voltage and pgi, pgo input threshold voltage pgi v pgi 1.1 1.15 1.2 v under-voltage protect v s33 2.6 2.8 3.0 under-voltage protect v s5 4.0 4.2 4.4 under-voltage protect v s12 , v s12b v uvp 9.4 9.9 10.4 v low level output voltage (pgo) v ol v dd = 12v i sink =10ma 0.7 v leakage current (pgo) i leak pgo = 5v 5 a under-voltage enable delay time 49 75 114 ms timing pg delay pgi to pgo t pg 200 300 450 ms noise deglitch time pgi to pgo 150 250 350 s timing uvp to protection (fpo) t uvp v s33 ,v s5 , v s12 ,v s12b 73 s over-voltage and over-current protection over-voltage protection v s33 3.7 3.9 4.1 over-voltage protection v s5 5.7 6.1 6.5 over-voltage protection v s12 , v s12b v ovp 13.2 13.8 14.4 v ratio of current sense sink current to current sense setting pin (ri) source current i ref ri = 30 ? , 0.1% resistor 7.6 8 8.4 current source reference voltage v ref 1.1 1.15 1.2 v ocp comparator input offset voltage v i(off) -5 5 mv low level output voltage (fpo) v ol i sink =20ma 0.7 v leakage current (fpo) i leak v (fpo) = 5v 5 a timing ovp to protection t ovp 73 s timing ocp to protection t ocp 73 s
s3515 cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r502-073,b ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit pson control high-level input voltage v ih 1.9 v low-level input voltage v il 0.98 v timing pgo low to fpo high t psoff 1.6 2.8 4.0 ms on 24 38 57 ms timing pson to on/off off t pson 24 38 57 ms input pull-up current i pson pson = 0v 120 a total device supply current i dd pson = 5v, v dd = 5v 1.0 1.8 ma v dd start threshold voltage v thd 4.0 v v dd min. operation voltage after start-up v min 3.65 v
s3515 cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r502-073,b ? typical application circuit
s3515 cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r502-073,b ? timing diagram pson on/off and 3.3v, 5v,12v ovp function v dd pson fpo pgi pgo t pson(on) t ovp t pg t psoff 3.3v,5v,12v t pson(off) 3.3v,5 v,12v ovp uvp and ocp function v dd pson fpo pgi pgo 12v t ovp t uvp t ocp ocp
s3515 cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r502-073,b 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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