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?2002 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.2 features ? programmable output voltage to 36 volts ? low dynamic output impedance 0.20 typical ? sink current capability of 1.0 to 100ma ? equivalent full-range temperature 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/tl431aare three-terminal adjustable regulator series with a guaranteed thermal 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 0.2w active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacement 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 o c storage temperature range t stg -65 ~ +150 o 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 input voltage v ref v ka =v ref , i ka =10ma 2.440 2.495 2.550 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 - 4.5 17 - 4.5 17 mv ratio of change in reference input voltage ? v ref / ? v ka i ka =10ma ? v ka =10v- v ref - - 10 - 2.7 - - 1.0 - 2.7 mv/v to the change in cathode voltage ? 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 +0.10 ?.05 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 0.05 0.010 +0.004 0.002 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 3/15/02 0.0m 001 stock#dsxxxxxxxx ? 2002 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 life, 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 any component of a life support device or system whose failure 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 without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent 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
product folder - fairchild p/n tl431a - adjustable/2.5v, 1% tolerance shunt regulator fairchild semiconductor space space space search | parametric | cross reference space product folders and datasheets application notes space space space find products home >> find products >> space space space space products groups space analog and mixed signal discrete interface logic microcontrollers non-volatile memory optoelectronics markets and applications new products product selection and parametric search cross-reference search technical information buy products technical support my fairchild company tl431a adjustable/2.5v, 1% tolerance shunt regulator related links request samples dotted line how to order products dotted line product change notices (pcns) dotted line support dotted line distributor and field sales representatives dotted line quality and reliability dotted line design tools contents general description | features | product status/pricing/packaging | application notes general description the tl431/tl431a are three-terminal adjustable regulator series with a guaranteed thermal 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 0.2w. active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications. back to top features l programmable output voltage to 36 volts l low dynamic output impedance 0.20 typical l sink current capability of 1.0 to 100ma l equivalent full-range temperature coefficient of 50ppm/ c typical l temperature compensated for operation over full rated operating temperature range l low output noise voltage l fast turn-on response back to top space datasheet download this datasheet pdf e-mail this datasheet [e- mail] this page print version file:///d|/pdf/tl431a.html (1 of 2) [26-jul-2002 2:18:40 pm]
product folder - fairchild p/n tl431a - adjustable/2.5v, 1% tolerance shunt regulator product status/pricing/packaging product product status package type leads packing method TL431ACZx full production to-92 3 tape reel TL431ACZ full production to-92 3 bulk tl431acd not recommended for new designs soic 8 rail tl431aclp full production to-92 3 bulk tl431aclpx full production to-92 3 tape reel back to top application notes an-9018-3: an-9018-3 (part 3 of 3) smart power module user's guide (544 k) jul 19, 2002 an-9019: an-9019 motor drive system using spm inverter (260 k) jul 19, 2002 back to top space space home | find products | technical information | buy products | support | company | contact us | site index | privacy policy ? copyright 2002 fairchild semiconductor space space file:///d|/pdf/tl431a.html (2 of 2) [26-jul-2002 2:18:40 pm]

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