unisonic technologies co., ltd TL431 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2005 unisonic technologies co., ltd qw-r103-003,r programmable precision reference . description the utc TL431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. the output voltage may be set to any value between v ref (approximately 2.5v) and 36 v with two external resistors. it provides very wide applications, in cluding shunt regulator, series regulator, switching regulator , voltage reference and others. features *programmable output voltage to 36v. *low dynamic output impedance 0.2 ? . *sink current capability of 1.0 to 100ma. *equivalent full-range temper ature coefficient of 50ppm/ c typical for operation over full rated operating te mperature range. to-92 1 sop-8 sot-89 1 sot-25 sot-23 1 3 2 4 5 3 2 1 *pb-free plating product number: TL431k *pb-free plating product for sot-23ns type number: TL431nsl ordering information order number pin assignment normal lead free plating 1 2 3 4 5 6 7 8 package packing TL431-ab3-r TL431k-ab3-r r a k - - - - - sot-89 tape reel TL431-ae3-r TL431k-ae3-r k r a - - - - - sot-23 tape reel TL431ns-ae3-r TL431nsl-ae3-r r k a - - - - - sot-23 tape reel TL431-af5-r TL431k-af5-r x x k r a - - - sot-25 tape reel TL431-s08-r TL431k-s08-r k aaxxaar sop-8 t ape reel TL431-s08-t TL431k-s08-t k aaxxaar sop-8 t ube TL431-t92-b TL431k-t92-b r a k - - - - - to-92 tape box TL431-t92-k TL431k-t92-k r a k - - - - - to-92 bulk TL431-t92-r TL431k-t92-r r a k - - - - - to-92 tape reel note: pin code: k: cathode a: anode r: reference x: no connection TL431k-ab3-r (1)packing type (2)package type (3)lead plating (1) b: tape box, k: bulk, r: tape reel, t: tube (2) ab3: sot-89, ae3: sot-23, af5: sot-25, s 08:sop-8, t92: to-92 (3) k: lead free plating, blank: pb/sn l : lead free plating, only for sot-23ns type marking (sot-23/sot-25) 431 431n for TL431 for TL431ns lead plating lead plating
TL431 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-003,r block diagram 2.5v v ref cathode anode reference cathode (k) anode(a) reference (r)
TL431 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-003,r absolute maximum ratings (operating temperatur e range applies unless otherwise specified) parameter symbol ratings unit cathode voltage v ka 37 v cathode current range(continuous) i ka -100 ~ +150 ma reference input current range i ref -0.05 ~ +10 ma to-92 770 mw sot-89 800 mw power dissipation sot-23/sot-25 p d 300 mw operating juncti on temperature t j +150 c operating ambient temperature t opr -40 ~ +85 c storage temperature t stg -65 ~ +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 operati on is not implied. recommended operating conditions parameter symbol min typ max unit cathode voltage v ka v ref 36 v cathode current i ka 1 100 ma electrical characteristics (t c = 25
, unless otherwise specified.) parameter symbol test conditions min typ max unit reference input voltage v ref v ka =v ref ,i ka =10ma 2.470 2.495 2.520 v deviation of reference input voltage over temperature ? v ref / ? t v ka =v ref ,i ka =10ma 0 c &? ta &? 70 c 4.5 17 mv ? v ka =10v~v ref -1.0 -2.7 ratio of change in reference input voltage to the change in cathode voltage ? v ref / ? v ka i ka =10ma ? v ka =36v~10v -0.5 -2.0 mv/v reference input current i ref i ka =10ma, r1=10k ? , r2= 1.5 4 a deviation of referenc e input current over full temperature range ? i ref / ? t i ka =10ma, r1=10k ? , r2= ta =full temperature 0.4 1.2 a minimum cathode current for regulation i ka(min) v ka =v ref 0.45 1.0 ma off-state cathode current i ka(off) v ka =36v, v ref =0 0.05 1.0 a dynamic impedance z ka v ka =v ref , i ka =1 to 100ma f 1.0khz 0.15 0.5 ?
TL431 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-003,r typical characteristics -2 -1 0 1 2 3 -100 -75 -50 -25 0 25 50 75 100 125 cathode voltage (v) cathode current (ma) -1 1 023 -200 0 400 200 600 800 -2 cathode voltage (v) cathode current (ma) 0 5 10 15 20 25 30 35 40 0 -5 -10 -15 -20 -25 -30 -35 -40 cathode voltage (v) 0 1234567 0 1 2 3 4 5 6 7 time ( ? s) input and output voltage (v) pulse response ta=25c -10 0 10 20 30 40 50 60 70 7 10 6 10 5 10 10 4 10 3 small signal voltage amplification vs . frequency voltage amplification (db) frequency (hz) change in reference input voltage (mv) i ka =100ma ta=25c ta=25c v ka =v ref ta=25c v ka =v ref ta=25c i ka =10ma 2 10 1 10 -1 10 0 10 7 10 6 10 5 10 10 4 10 3 impedance ( ?
frequency (hz) ta=25c i ka =0ma to 100ma dynamic impedance vs . frequency change in reference input voltage vs . cathode voltage cathode current vs . cathode voltage cathode current vs . cathode voltage i ka(min)
TL431 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r103-003,r typical characteristics (cont.) temperature reference voltage 2.52 2.51 2.5 2.49 2.48 2.47 2.46 2.45 - 4 0 c - 2 0 c 0 c 2 0 c 4 0 c 6 0 c 8 0 c 1 0 0 c 0 20 40 60 80 100 120 140 100p 1n 10n 100n 1 ? 10 ? cathode current, i k (ma) load capacitance, c l a v ka =vref b v ka =5.0v@i k =10ma c v ka =10v@i k =10ma d v ka =15v@i k =10ma ta=25
a b c d unstable stable stable
TL431 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-003,r test circuit input v ka v ref i ka utc TL431 r1 r2 i ref v ka= v ref*( 1 + r1 / r2 )+ i ref* r1 input v ka v ref i ka utc TL431 input v ka i ka(off) utc TL431 for v ka =v ref for v ka &? v ref for i ka(off) application circuit v in vo ut v ref utc TL431 r1 r2 vo=(1+r1/r2)*v ref v ref utc TL431 r1 r2 vo=(1+r1/r2)*v ref utc7805 out in common v ref utc TL431 r1 r2 vo=(1+r1/r2)*v ref v in vo ut vo ut v in shutdown regulator output control of a three higher-current shunt regulator -terminal fixed regulator utc TL431 rs io utc TL431 rs io i o =v ref /r s vo ut v in v in vo ut r cl r s =v ref /r cl constant-current sink current limiting or current source 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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