?2011 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.4 features ? programmable output voltage to 36 volts ? low dynamic output impedance 0.2 typical ? sink current capability of 1.0 to 100ma ? equivalent full-range te mperature coefficient of 50ppm/ c typical ? temperature compensated for operation over full rated operating temperature range ? low output noise voltage ? fast turn-on response description the tl431/TL431A are three-terminal adjustable regulator series with a guaranteed th ermal stability over applicable temperature ranges. the output voltage may be set to any value between v ref (approximately 2.5 volts) and 36 volts with two external resistors these devices have a typical dynamic output impedance of 0.2 . active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacemen t for zener diodes in many applications. to-92 8-dip 8-sop 1. ref 2. anode 3. cathode 1. cathode 2. 3. 6. 7. anode 8. ref 4. 5. nc 1 1 1 1.cathode 2.3.4.5.7.nc 6.anode 8.ref tl431/TL431A programmable shunt regulator
tl431/TL431A 2 internal block diagram absolute maximum ratings (operating temperature range applies unless otherwise specified.) recommended operating conditions parameter symbol value 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 power dissipation d, lp suffix package p suffix package p d 770 1000 mw mw operating temperature range t opr -25 ~ +85 c junction temperature t j 150 c storage temperature range t stg -65 ~ +150 c parameter symbol min typ max unit cathode voltage v ka v ref -36v cathode current i ka 1.0 - 100 ma + -
tl431/TL431A 3 electrical characteristics (t a = +25 c, unless otherwise specified) ?t min = -25 c, t max = +85 c parameter symbol conditions tl431 TL431A unit min. typ. max. min. typ. max. reference in put voltage v ref v ka =v ref , i ka =10ma 2.440 2.495 2.5 50 2.470 2.495 2.520 v deviation of reference input voltage over- temperature (note 1) v ref / t v ka =v ref , i ka =10ma t min t a t max -4.517 -4.517mv ratio of change in reference in put voltage to the change in cathode voltage v ref / v ka i ka =10ma v ka =10v- v ref - - 1.0 -2.7 - -1.0 -2.7 mv/v v ka =36v- 10v - -0.5 -2.0 - -0.5 -2.0 reference input current i ref i ka =10ma, r 1 =10k ,r 2 = -1.54 -1.54 a deviation of reference input current over full temperature range i ref / t i ka =10ma, r 1 =10k ,r 2 = t a =full range - 0.4 1.2 - 0.4 1.2 a minimum cathode cur- rent for regulation i ka(min) v ka =v ref - 0.45 1.0 - 0.45 1.0 ma off - stage cathode current i ka(off) v ka =36v, v ref =0 - 0.05 1.0 - 0.05 1.0 a dynamic impedance (note 2) z ka v ka =v ref , i ka =1 to 100ma f 1.0khz - 0.15 0.5 - 0.15 0.5
tl431/TL431A 4 test circuits figure 1. test circuit for v ka =v ref figure 2. test circuit for v ka v ref tl431/a tl431/a tl431/a figure 3. test circuit for l ka(off)
tl431/TL431A 5 typical perfomance characteristics figure 1. cathode current vs. cathode voltage figure 3. change in reference input voltage vs. cathode voltage figure 5. small signal voltage amplification vs. frequency figure 2. cathode current vs. cathode voltage figure 4. dynamic impedance frequency figure 6. pulse response
tl431/TL431A 6 typical application figure 10. shunt regulator figure 11. output control for three- termianl fixed regulator figure 12. high current shunt regula- tor figure 13. current limit or current source figure 14. constant-current sink v o 1 r 1 r 2 ------ - + ?? ?? v ref = tl431/a v o v ref 1 r 1 r 2 ------ - + ?? ?? = tl431/a mc7805/lm7805 v o 1 r 1 r 2 ------ - + ?? ?? v ref = tl431/a tl431/a tl431/a
tl431/TL431A 7 mechanical dimensions package 0.46 0.10 1.27typ (r2.29) 3.86max [1.27 0.20 ] 1.27typ [1.27 0.20 ] 3.60 0.20 14.47 0.40 1 .02 0.10 (0.25) 4.58 0.20 4.58 +0.25 ?.15 0.38 +0.1 0 ?.0 5 0.38 +0.10 ?.05 to-92
tl431/TL431A 8 mechanical dimensions (continued) package 6.40 0.20 3.30 0.30 0.130 0.012 3.40 0.20 0.134 0.008 # 1 # 4#5 #8 0.252 0.008 9.20 0.20 0.79 2.54 0.100 0.031 ( ) 0.46 0.10 0.018 0.004 0.060 0.004 1.524 0.10 0.362 0.008 9.60 0.378 max 5.08 0.200 0.33 0.013 7.62 0~15 0.300 max min 0.25 +0.10 ?.05 0.010 +0.004 ?.002 8-dip
tl431/TL431A 9 mechanical dimensions (continued) package 4.92 0.20 0.194 0.008 0.41 0.10 0.016 0.004 1.27 0.050 5.72 0.225 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 6.00 0.30 0.236 0.012 3.95 0.20 0.156 0.008 0.50 0.20 0.020 0.008 5.13 0.202 max #1 #4 #5 0~8 #8 0.56 0.022 () 1.80 0.071 max0.10 max0.004 max min + 0.10 -0.05 0.15 + 0.004 -0.002 0.006 8-sop
tl431/TL431A 2/22/11 0.0m 001 stock#ds400301 ? 2011 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain lif e, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in an y component of a life support device or system whose fa ilure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes with out further notice to any products herein to improve re liability, function or design. fairchild does not assume any liability arising out of the applic ation or use of any product or circuit described herein; neither does it convey any license under its pat ent rights, nor the rights of others. ordering information product number output voltage tolerance package operating temperature TL431Aclp 1% to-92 -25 ~ + 85 o c TL431Acd 8-sop tl431clp 2% to-92 tl431cp 8-dip tl431cd 8-sop
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