programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 1 - htc to-92 pkg 3 2 1 sot-23 pkg 2 1 3 sot-89 pkg 1 2 3 pin 1. reference 2. anode 3. cathode ordering information device (marking) package tl431z tl431-az tl431-cz to-92 431z sot-23 3l features z programmable output voltage to 40v z guaranteed 0.5% reference voltage tolerance z low (0.2 ? typ.) dynamic output impedance z cathode current range(continuous) ? 100 ~ 150 ma z equivalent full range temperature coefficient of 50ppm/ z temperature compensated for operation over full rate operating temperature range z low output noise voltage z fast turn-on response z to-92, sot-89 or sot-23 3l package application z shunt regulator z precision high-current series regulator z high-current shunt regulator z crowbar circuit z pwm converter with reference z voltage monitor z precision current limiter descripsion the tl431z is a three-terminal adjustable shunt regulator with specified thermal stability over applicable temperature v ref (approx. 2.5v) and 40v with two external resistors. this device has a typical dynamic output impedance of 0.2 ? . active output circuitry provides a very sharp turn-on characteristic, making this device excellent replacement for zener diodes in many applications. the tl431z is characterized for operation from -40 to +125 . 431z sot-89 3l absolute maximum ratings (operating temperature range applies unless otherwise specified) characteristic symbol min. max. unit cathode voltage v ka - 42 v cathode current range(continuous) i k -100 150 ma reference input current range i ref 0.05 10 ma junction temperature range t j 0 150 storage temperature range t stg -60 150 operating temperature range t opr -40 125 t o p top top
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 2 - htc recommended operating conditions characteristic symbol min. max. unit cathode voltage v ka v ref 40 v cathode current i k 0.5 100 ma ordering information v ref package tolerance order no. package marking status tl431cz obsolete 0.5% tl431czta tl431-cz obsolete tl431az obsolete 1% tl431azta tl431-az obsolete tl431z obsolete to-92 2% TL431ZTA tl431z obsolete 0.5% tl431czsf obsolete 1% tl431azsf obsolete sot-23 2% tl431zsf 431z obsolete 0.5% tl431czf obsolete 1% tl431azf obsolete 2.495v sot-89 2% tl431zf 431z obsolete package type : bulk : to-92 : sot-23 : sot-89 tolerance cz : 0.5% a z : 1% z : 2% root name tl 431 cz sf product code blank ta sf f
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 3 - htc pin configuration to-92 pkg sot-23 pkg sot-89 pkg pin description to-92 / sot-23 / sot-89 pin no. name function 1 reference reference voltage 2 anode ground 3 cathode input supply voltage tl431z electrical characteristics (t a =25 , unless otherwise specified) characteristic symbol test condition min. typ. max. unit tl431cz 2.483 2.495 2.507 tl431az 2.47 2.495 2.52 reference input voltage v ref v ka =v ref , i k =10ma tl431z 2.44 2.495 2.55 v deviation of reference input voltage v ref / t v ka = v ref , i k =10ma t a =full range 3 17 mv v ka =10v -v ref -1.4 -2.7 ratio of change in reference input voltage to the change in cathode voltage v ref / v ka i k =10ma v ka =36v-10v -1.0 -2.0 mv/v reference input current i ref i ka =10ma, r 1 =10 ?, r 2 = 1.8 4.0 ua deviation of reference input current i ref / t i k =10ma, r 1 =10 ?, r 2 = t a =full range 0.4 1.2 ua minimum cathode current for regulation i k(min) v ka = v ref 0.5 ma off-state cathode current i k off v ka =42v, v ref =0 0.17 0.9 ua dynamic impedance z ka v ka = v ref , i k =1ma~100ma f 1khz 0.27 0.5 ? top top 1 2 3 1 3 1 2 2 3 marking side
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 4 - htc test circuits [ fig 1. test circuit for v ka = v ref ] [ fig 2. test circuit for v ka v ref ] [ fig 3. test circuit for i ka (off) ]
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 5 - htc the deviation parameters v ref / t and i ref / t are defined as the differences between the maximum and minimum values obtained over the recommended temper ature range. the average full-range temperature coefficient of the reference voltage, v ref , is defined as : where : t a is the recommended operating free-air temperature range of the device. v ref can be positive or negative, depending on whether minimum v ref or maximum v ref , respectively, occurs at the lower temperature. example : maximum v ref =2496mv at 30 , m aximum v ref =2492mv at 0 , v ref =2495mv at 25 , t a =70 for tl431c z. c ppm c mv mv a ref v ? ? ? ? ? ? = 23 70 10 2495 4 6 because minimum v ref occurs at the lower temperature, the coefficient is positive. calculating dynamic impedance the dynamic impedance is defined as : ka ka ka i v z = when the device is operating with two external resistors, the total dynamic impedance of the circuit is given by : ? ? ? ? ? ? + = 2 1 1 ' r r z i v z ka
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 6 - htc typical operating characteristics 2.492 2.493 2.494 2.495 2.496 2.497 2.498 2.499 2.500 2.501 0 20 40 60 80 100 120 0 1 2 3 4 5 6 -1012345678 -0.10 -0.08 -0.05 -0.03 0.00 0.03 0.05 0.08 0.10 0.13 0.15 -2.0 -1.0 0.0 1.0 2.0 3.0 t. b . d reference voltage vs junction temperatur t j -junction temperature ( ) v ref -reference voltage (v) input & output voltage (v) t-time (us) in p ut out p ut pulse respons v k a -cathode volta g e ( v ) i ka -cathode current ( ma ) cathode current vs cathode voltage cathode current vs cathode voltage -200 0 200 400 600 800 -1.0 0.0 1.0 2.0 3.0 v ka -cathode v olta g e ( v ) i ka -cathode current ( ua ) v ka =v ref i ka =10ma t a =25 v ka =v ref t a =25 v ka =v ref t a =25 v ka =v ref i ka =10ma v ref =2.495v 0.5%
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 7 - htc appication information 1. shunt regulator note a : r should provide cathode current 1ma to the tl431z at minimum v i(batt) 2. precision high-current series regulator note a : r should provide cathode current 1ma to the tl431z at minimum v i(batt) 3. output control of a three-terminal fixed regulator tl431z tl431z tl431z
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 8 - htc 4. high-current shunt regulator 5. precision 5-v 1.5a regulator 6. efficient 5-v precision regulator note a : r b should provide cathode current 1ma to the tl431z . tl431z tl431z tl431z
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 9 - htc 7. pwm converter with reference 8. voltage monitor note a : r3 and r4 are selected to provide the desired led intensity and cathode current 1ma to the tl431z at the available v i(batt) . 9. delay timer tl431z tl431z tl431z
programmable precision shunt regulator tl431z/az/cz 2009 ? obsolete - 10 - htc 10. precision current limiter 11. precision constant-current sink tl431z tl431z
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