unisonic technologies co., ltd tl431 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2009 unisonic technologies co., ltd qw-r103-003,z 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 36v with tw o 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 1.0 to 100ma. * equivalent full-range temperature coefficient of 50ppm/ c typical for operation over full rated operating temperature range. lead-free: tl431k halogen-free: tl431g tl431ns for sot-23 lead-free: tl431nsl halogen-free: tl431nsg ? ordering information ordering number pin assignment normal lead free halogen free 12345678 package packing tl431-ab3-r tl431k-ab3-r tl431g-ab3-r r a k - - - - - sot-89 tape reel tl431-ae2-r tl431k-ae2-r tl431g-ae2-r k r a - - - - - sot-23-3 tape reel tl431-ae3-r tl431k-ae3-r tl431g-ae3-r k r a - - - - - sot-23 tape reel tl431ns-ae3-r tl431nsl-ae3-r tl431nsg-ae3-r r k a - - - - - sot-23 tape reel TL431-AF5-R tl431k-af5-r tl431g-af5-r x x k r a - - - sot-25 tape reel tl431-s08-r tl431k-s08-r tl431g-s08-r kaaxxaar sop-8 t ape reel tl431-t92-b tl431k-t92-b tl431g-t92-b r a k - - - - - to-92 tape box tl431-t92-k tl431k-t92-k tl431g-t92-k r a k - - - - - to-92 bulk note: pin code: k: cathode a: anode r: reference x: no connection
tl431 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-003,z ? marking package marking sot-23-3 sot-23 3 431. 1 2 k: lead free g: halogen free sot-23 (tl431ns) 3 431n 1 2 l: lead free g: halogen free sot-25 321 431 5 4 k: lead free g: halogen free
tl431 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-003,z block diagram 2.5v v ref cathode anode reference cathode (k) anode(a) reference (r)
tl431 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-003,z ? absolute maximum ratings (operating temperature 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-23-3/sot-25 p d 300 mw operating junction t j +150 c operating ambient 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 oper ation 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 = 25c, 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 referenc e input voltage over temperature t v ref v ka =v ref ,i ka =10ma 0c ta 70c 4.5 17 mv v ka =10v~v ref -1.0 -2.7 mv/v ratio of change in reference input voltage to the change in cathode voltage ka ref v v 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 t i ref 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 0.19 0.5 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 5 of 6 www.unisonic.com.tw qw-r103-003,z typical characteristics -1 1 023 -200 0 400 200 600 800 -2 cathode voltage (v) cathode current ( a) 01234567 0 1 2 3 4 5 6 7 time ( s) input and output voltage (v) pulse response t a =25c change in reference input voltage (mv) t a =25c v ka =v ref change in reference input voltage vs. cathode voltage cathode current vs. cathode voltage i ka(min) 0 5 10 15 20 25 30 35 40 -1 -1 cathode voltage (v) -2 -1 0 1 2 3 -100 -75 -50 -25 0 25 50 75 100 125 cathode voltage (v) cathode current (ma) cathode current vs. cathode voltage 150 t a =25c v ka =v ref 0 -5 -10 -15 -20 -25 -30 -35 -40 i ka =100ma ta=25c
tl431 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-003,z ? test circuit input v ka v ref i ka utc tl431 input v ka i ka(off) utc tl431 v ka =v ref (1+r 1 /r 2 )+i ref r 1 for v ka =v ref for v ka v ref for i ka(off) ? application circuit v ref r 1 r 2 utc7805 out in common v in v out utc tl431 v ref r 1 r 2 v out v in utc tl431 v out =(1+r 1 /r 2 )v ref v out =(1+r 1 /r 2 )v ref minimum v out =v ref +5v v out =(1+r 1 /r 2 )v ref shutdown regulator output control of a three -terminal fixed regulator higher-current shunt regulator utc tl431 r s v out v in i out utc tl431 r s i out v in v out r cl i out =v ref /r s 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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