unisonic technologies co., ltd uu4793 preliminary linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2012 unisonic technologies co., ltd qw-r121-022.a overload monitoring with resistive load, v t = 44.5 mv ? description the utc uu4793 is a bipolar integrated circuit designed for monitoring over loading or short ci rcuit in automotive or industrial applications. the threshold v t is 44.5 mv and v 4, 6 =v s -v t . v t is not dependent of the power supply voltage v s . if the voltage developed across shunt resistor r sh exceeds v t , ic turns on the output, or else turns off the output. the output is turned off when i nput switch pin 8 is open or there is a lack of power supply voltage. the output breakdown voltage is decided by the z-diodes z 3 and z 5 which have a typical value of v z = 22 v. a not used of the comparator i nput have to be connected to pin 7. ? features * two common reference comparators * tight threshold tolerance * constant threshold * output with npn * 8 kv - esd protection * protection of reverse polarity * load-dump protection ? ordering information ordering number package packing lead free halogen free uu4793l-s08-r uu4793g-s08-r sop-8 tape reel uu4793l-s08-t UU4793G-S08-T sop-8 tube
uu4793 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r121-022.a ? pin configuration ? pin description pin no. pin name description 1 gnd ground 2 v s power supply voltage 3 out2 comparator 2 output 4 in1 comparator 1 input 5 out1 comparator 1 output 6 in2 comparator 2 input 7 v ref reference voltage 8 input switch input switch pin ? block diagram
uu4793 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r121-022.a ? absolute maximum rating parameter symbol ratings unit supply voltage pin 2, 7 v s 16.5 v current consumption ( t =2ms, measured at pin 1 (gnd) ) pin 1 i 1 1.5 a output current pin 3, 5 i 3,5 20 ma input voltage ( reference point pin 7 ) pin 4, 6 -v 4, 6 6 v power dissipation t a = 95c p d 360 mw t a = 60 c 560 ambient temperature t a -40 ~ +95 c junction temperature t j 150 c storage temperature t stg -55 ~ +125 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 160 k/w ? electrical characteristics (v s = 9~15 v, t a = -40~+95 c, fig. 1, unless otherwise specified) parameter symbol test conditions pin min typ max unit supply voltage v s 2, 7 9 15 v internal z-diode z 2 v z 2 20 v current consumption i 1 v s =12v measured at pin 1 (gnd) 1 4.5 6 ma output saturation voltage v sat v s = 9v, i 3, 5 =10ma, t a = 25c 3, 5 0.5 v output z-diodes z 3 , z 5 v z 3, 5 21 v control signal threshold -v t i 3, 5 = 1ma, t a = 25c 4, 6 43 44.5 46 mv temperature coefficient of control signal threshold t c 15 v/k threshold voltage v 8 switch identification 8 0.6 v s v input currents i i 4, 6 100 na 8 5 a delay time t d ( on ) switch-on high to low 3, 5 6 s t d ( off ) switch-off low to high 30 s
uu4793 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r121-022.a ? typical application circuit ? timing diagram 11.90 12.00 v 4, 6 (v) v 0 (v) 6 12 0102030405060 t (s) t d (on) t d (off) fig. 2 timing diagram
uu4793 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r121-022.a 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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