utc TL431A linear integrated circuit utc unisonic technologies co., ltd. 1 qw-r103-007,d programmable precision reference description the utc TL431A 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 vref(approximately 2.5v) and 36v with two external resistors. it provides very wide applications, including 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 to 100ma. *equivalent full-range temperature coefficient of 50ppm/ c typical for operation over full rated operating temperature range. to-92 1 sop-8 sot-89 1 sot-23 1 2 3 sop-8 1: cathode 2,3,6,7: anode 8: ref. 4,5: n.c. to-92 1: ref ; 2: anode; 3: cathode sot-89 1: ref ; 2: anode; 3: cathode sot-23 1: cathode; 2: ref; 3: anode *pb-free plating product number: TL431Ak block diagram 2.5v vref cathode anode reference cathode (k) anode(a) reference (r)
utc TL431A linear integrated circuit utc unisonic technologies co., ltd. 2 qw-r103-007,d absolute maximum ratings (operating temperature range applies unless otherwise specified)) parameter symbol value unit cathode voltage v ka 37 v cathode current range(continuous) i ka -100 ~ +150 ma reference input current range iref -0.05 ~ +10 ma operating junction temperature tj 150 c operating ambient temperature topr -40 ~ +85 c storage temperature temperature tstg -65 ~ +150 c 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 (ta=25 c, unless otherwise specified) parameter symbol test conditions min typ max unit reference input voltage vref v ka =v ref ,i ka =10ma 2.483 2.495 2.507 v deviation of reference input voltage over temperature(note 1) ? vref/ ? t v ka =v ref ,i ka =10ma t min <=t a<= t max 4.5 17 mv ratio of change in reference input voltage to the change in cathode voltage ? vref / ? v ka i ka =10ma ? v ka =10v~v ref ? v ka =36v~10v -1.0 -0.5 -2.7 -2.0 mv/v reference input current iref i ka =10ma,r1=10k ? , r2= 1.5 4 a deviation of reference input current over full temperature range ? iref/ ? t i ka =10ma,r1=10k ? , r2= t a =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 ? note:t min =0 c,t max =+70 c
utc TL431A linear integrated circuit utc unisonic technologies co., ltd. 3 qw-r103-007,d typical performance characteristics -2 -1 0 1 2 3 -100 -75 -50 -25 0 25 50 75 100 125 cathode voltage (v) cathode current (ma) fig 1 cathode current vs cathode voltage ta=25 v ka =v ref -1 1 023 -200 0 400 200 600 800 -2 cathode voltage (v) cathode current (ma) fig 2 cathode current vs cathode voltage ta=25 v ka =v ref i ka(min) 0 5 10 15 20 25 30 35 40 0 -5 -10 -15 -20 -25 -30 -35 -40 cathode voltage (v) change in reference input voltage (mv) fig 3 change in reference input voltage vs cathode voltage i ka =100ma ta=25 01234567 0 1 2 3 4 5 6 7 time ( s) input and output voltage (v) fig 4 pulse response ta=25 2 10 1 10 -1 10 0 10 7 10 6 10 5 10 10 4 10 3 impedance ( ? )? frequency (hz) fig 5 dynamic impedance vs frequency ta=25 i ka =0ma to 100ma -10 0 10 20 30 40 50 60 70 7 10 6 10 5 10 10 4 10 3 fig 6 small signal voltage amplification vs frequency voltage amplification (db) frequency (hz) ta=25 i ka =10ma
utc TL431A linear integrated circuit utc unisonic technologies co., ltd. 4 qw-r103-007,d test circuit input v ka v ref i ka utc TL431A r1 r2 i ref v ka= v ref*( 1 + r1 / r2 )+ i ref* r1 input v ka v ref i ka utc TL431A input v ka i ka(off) utc TL431A fig 7 test circuit for v ka =v ref fig 8 test circuit for v ka >= v ref fig 9 test circuit for i ka(off) application circuit vi vo v ref utc TL431A r1 r2 vo=(1+r1/r2)*v ref vi vo v ref utc TL431A r1 r2 vo=(1+r1/r2)*v ref utc7805 out in common vi vo v ref utc TL431A r1 r2 vo=(1+r1/r2)*v ref fig 10 shutdown regulator fig 11 output control of a three fig 12 higher-current shunt regulator -terminal fixed regulator vi vo utc TL431A rs r s =v ref /rcl rcl i o vi vo utc TL431A rs io i o =v ref /r s fig 13 constant-current sink fig 14 current limiting or current source
utc TL431A linear integrated circuit utc unisonic technologies co., ltd. 5 qw-r103-007,d 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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