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- tl431 www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 1 adjustable precision shunt regulator ? description ? features the et tl431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. the output voltage may be set to any value between vref and 36 volts with two external resistors. these device have a typical dynamic output impedance of 0.27 , active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications. ? programmable output voltage to 36v. ? low dynamic output impedance : et tl431xxc/i: 0.27 (typical). et tl431xxq: 0.15 (typical) ? sink current capability of 0.1ma to 100ma. ? equivalent full-range temperature coefficient of 50 ppm/ o c ? temperature compensated for operation over full rated operating temperature range. ? low output noise voltage. ? fast turn on responds. ? sot-23, to-92, sot-89, sop-8 packages ? symbol ? applications ? precision voltage reference ? linear regulator ? adjustable power supply ? switching power supply ? graphic card ? adapter ? pin description et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 2 ? ordering information pin assignment part number accurate temperature package r a c packing tl431aac sot-23 1 3 2 tape & reel tl431aec to-92 1 2 3 tape & box tl431adc sot-89 1 2 3 tape & reel tl431akc 0 o c~+70 o c sop-8 8 2,3,6,7 1 tape & reel tl431aai sot-23 1 3 2 tape & reel tl431aei to-92 1 2 3 tape & box tl431adi sot-89 1 2 3 tape & reel tl431aki -40 o c ~+125 o c sop-8 8 2,3,6,7 1 tape & reel tl431aaq sot-23 1 3 2 tape & reel tl431aeq to-92 1 2 3 tape & box tl431adq sot-89 1 2 3 tape & reel tl431akq 0.5% -60 o c ~+125 o c sop-8 8 2,3,6,7 1 tape & reel tl431bac sot-23 1 3 2 tape & reel tl431bec to-92 1 2 3 tape & box tl431bdc sot-89 1 2 3 tape & reel tl431bkc 0 o c~+70 o c sop-8 8 2,3,6,7 1 tape & reel tl431bai sot-23 1 3 2 tape & reel tl431bei to-92 1 2 3 tape & box tl431bdi sot-89 1 2 3 tape & reel tl431bki -40 o c ~+125 o c sop-8 8 2,3,6,7 1 tape & reel tl431baq sot-23 1 3 2 tape & reel tl431beq to-92 1 2 3 tape & box tl431bdq sot-89 1 2 3 tape & reel tl431bkq 1% -60 o c ~+125 o c sop-8 8 2,3,6,7 1 tape & reel ? absolute maximum ratings symbol parameter value unit et tl431xxc/i 40 v ka cathode voltage et tl431xxq 42 v i k cathode current range(continuous) -100~150 ma i ref reference input current range 0.05~10 ma et tl431xxc 0~+70 et tl431xxi -40~+125 t oper. operating temperature range et tl431xxq -60~+125 o c t j junction temperature range 150 o c t stg storage temperature range -65~+150 o c - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 3 ? thermal characteristics symbol parameter package typical value unit sot-23 416 to-92 250 sot-89 250 ja thermal resistance from junction to ambient in free air. (measured with the component mounted on a high effective thermal conductivity test board in free air.) sop-8 210 o c/w ? recommended operating conditions symbol characteristic min. typ. max. unit tl431xxc/i v ref - 36 v ka cathode voltage tl431xxq v ref 40 v tl431xxc/q 0.5 - 100 i k cathode current tl431xxi 1 - 100 ma ? electrical characteristics (t a =25 c, v ka =v ref , i k =10ma unless otherwise noted . ) symbol parameter test condition min. typ. max. unit 0.5% 2.483 2.495 2.508 v ref reference input voltage v ka =v ref , i k =10ma 1% 2.470 2.495 2.520 v v ref(dev) deviation of reference input voltage over full temperature range t min Q t a Q t max - 3 17 mv v ka =10v-v ref -0.4 - 2.7 v ref / v ka ratio of change in reference input voltage to the change in cathode voltage v ka =36v-10v -0.4 - 2.0 mv/ v i ref reference input current r 1 =10k , r 2 = - 1.8 4 ua i ref(dev) deviation of reference input current over full temperature range r 1 =10k , r 2 = - 0.4 1.2 ua i k(min) minimum cathode current for regulation - 0.25 0.5 ma i k(off) off-state cathode current v ka =40v, v ref =0 - 0.17 0.9 ua tl431xxc/i - 0.27 0.5 z ka dynamic impedance tl431xxq i k =1ma to 100ma f Q 1.0khz 0.15 0.5 - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 4 ? test circuit ? typical application circuits notes for typical application circuits: 1. for the series regulator applicatio ns, add a compensation capacitor c 1 between cathode and ref is strongly recommended to improve the stability of output voltage. 2. set vo according to the following equation: vo=v ref (1+r 1 /r 2 )+i ref xr 1 . 3. choose the value for r b as below: b (1). the maximum limit for r b should be such that the cathode current (i b k ) is greater than the minimum operating current (0.5ma) at v in(min) . (2). the minimum limit for r b should be such that the cathode current (i b k ) does not exceed 100ma under all load conditions, and the instantaneous turn-on value for i k does not exceed 120ma. - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 5 ? typical characteristics - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 6 ? typical characteristics (continued) - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 7 ? typical characteristics (continued) - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 8 ? package information sot-23 - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 9 ? package information to-92 - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 10 ? package information sot-89 - tl431 et
www.estek.com.cn copyright @ estek electronics co., ltd version 0.5 8th dec. 2011 11 ? package information sop-8 - tl431 et

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