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ts431 taiwan semiconductor document number: ds_p0000235 1 version: h15 2.495v programmable shunt voltage reference general description ts431 series integrated circuits are three-terminal programmable shunt regulator diodes. these monolith ic ic voltage references operate as a low temperature coefficient zener which is programmable from v ref to 36 volts with two external resistors. these devices ex hibit a wide operating current range of 1.0 to 100ma with a typical dynamic impedance of 0.22. the characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supp lies, and op amp circuitry. the 2.5v reference makes it convenient to obtain a stable reference from 5.0v l ogic supplies, and since the ts431 series operates as a shunt regulator, it can be used as either a positiv e or negative stage reference . features precision reference voltage ts431 C2.495v 2% ts431a C 2.495v 1% ts431b C 2.495v 0.5% equivalent full range temp. coefficient: 50ppm/c programmable output voltage up to 36v fast turn-on response sink current capability of 1~100ma low dynamic output impedance: 0.2 low output noise application smps lighting telecommunication home appliance to - 92 pin definition : 1. reference 2. anode 3. cathode sot - 23 pin definition : 1. reference 2. cathode 3. anode sop - 8 pin definition 1. cathode 5. n/c 2. anode 6. anode 3. anode 7. anode 4. n/c 8. reference notes: 1. moisture sensitivity level: level 3. per j-std-020 (sop-8) 2. moisture sensitivity level: level 1. per j-std-020 (sot-23) typical applicatin circuit
ts431 taiwan semiconductor document number: ds_p0000235 2 version: h15 absolute maximum ratings parameter symbol limit unit cathode voltage (note 1) v ka 37 v continuous cathode current range i k -100 ~ +150 ma reference input current range i ref -0.05 ~ +10 ma power dissipation to-92 p d 0.625 w sot-23 0.30 sop-8 0.50 junction temperature t j +150 c operating temperature range t oper 0 ~ +70 c storage temperature range t stg -65 ~ +150 c recommend operating condition parameter symbol limit unit cathode voltage v ka ref ~ 36 v continuous cathode current range i k 1 ~ 100 ma electrical characteristics parameter conditions s ymbol m in t yp m ax u nit reference voltage ts431a v ref 2.470 2.495 2.520 v ts431b 2.483 2.507 deviation of reference input voltage v ka = v ref , i k =10ma ta= full range ? v ref -- 3 17 mv radio of change in vref to change in cathode voltage i ka =10ma, v ka = 10v to v ref v ka = 36v to 10v ?v ref /?v ka -- -1.4 -2.7 mv/v -- -1.0 -2.0 reference input current r1=10k, r2= , i ka =10ma ta= full range i ref -- 0.7 4.0 ua deviation of reference input current, over temp. r1=10k, r2= , i ka =10ma ta= full range ?i ref -- 0.4 1.2 ua off-state cathode current v ref =0v , v ka =36v i ka (off) -- -- 1.0 ua v ref =0v , v ka =36v t j =-25c~125c (value is defined by design) -- -- 30 dynamic output impedance f<1khz, v ka = v ref i ka =1ma to 100ma | z ka | -- 0.22 0.5 minimum operating cathode current v ka = v ref i ka (min) -- 0.4 0.6 ma note : 1. voltage values are with respect to the anode termina l unless otherwise noted.
ts431 taiwan semiconductor document number: ds_p0000235 3 version: h15 ordering information part no. package packing ts431act b0g to-92 1,000pcs / bulk ts431bct b0g to-92 1,000pcs / bulk ts431act a3g to-92 2,000pcs / ammo ts431bct a3g to-92 2,000pcs / ammo ts431acx rfg sot-23 3,000pcs / 7 reel ts431bcx rfg sot-23 3,000pcs / 7 reel ts431acs rlg sop-8 2,500pcs / 13 reel ts431bcs rlg sop-8 2,500pcs / 13 reel ts431cs rlg sop-8 2,500pcs / 13 reel note: 1. compliant to rohs directive 2011/65/eu and in acco rdance to weee 2002/96/ec. 2. halogen-free according to iec 61249-2-21 definiti on. block diagram * the deviation parameters ?v ref and ?i ref are defined as difference between the maximum valu e and minimum value obtained over the full operating ambient tempera ture range that applied. * the average temperature coefficient of the reference input voltage, v ref is defined as: where: t2-t1 = full temperature change. v ref can be positive or negative depending on whether t he slope is positive or negative. example: maximum v ref =2.496v at 30c, minimum v ref =2.492v at 0c, v ref =2.495v at 25c, t=70c v ref | = [4mv / 2495mv] * 10 6 / 70c 23ppm/c because minimum v ref occurs at the lower temperature, the coefficient i s positive. * the dynamic impedance zka is defined as: | z ka | = v ka / i ka * when the device operating with two external resisto rs, r1 and r2, (refer to figure 2) the total dynami c impedance of the circuit is given by: | z ka | = v / i | z ka | * ( 1 + r1 / r2)
ts431 taiwan semiconductor document number: ds_p0000235 4 version: h15 additional information C stability when the ts431/431a/431b is used as a shunt regulato r, there are two options for selection of c l , are recommended for optional stability: a) no load capacitance across the device, decouple at the load. b) large capacitance across the device, optional dec oupling at the load. the reason for this is that ts431/431a/431b exhibits instability with capacitances in the range of 10nf to 1uf (approx.) at light cathode current up to 3ma (typ). the device is less stable the lower the cathode voltage has been set for. therefore while the device will be perfectly stable operating at a cath ode current of 10ma (approx.) with a 0.1uf capacito r across it, it will oscillate transiently during start up as the cathode current passes through the instability region. select a very low capacitance, or alternatively a high capacitance (10uf) will avoid this issue altogether. since the user will probably wish to have local decoupling at the load anyway, the most cost effect ive method is to use no capacitance at all directly across the device. pcb trace/via resistance and inductance prevent the loc al load decoupling from causing the oscillation dur ing the transient start up phase. note: if the ts431/431a/431b is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be 1nf or 10uf. applications examples figure 1. voltage monitor figure 2. output control for three terminal fixed regulator
ts431 taiwan semiconductor document number: ds_p0000235 5 version: h15 applications examples (continue) figure 3. shunt regulator figure 4. high current shunt regulator figure 5. series pas s regulator figure 6. cons tant current source figure 7. triac crowbar figure 8. scr crowbar
ts431 taiwan semiconductor document number: ds_p0000235 6 version: h15 applications examples (continue) vin vout vref 0.74v figure 9. single-supply comparator with temperature-compensated threshold figure 10. constant current sink figure 11. delay timer
ts431 taiwan semiconductor document number: ds_p0000235 7 version: h15 typical performance characteristics test circuit for voltage amplification figure 12. small-signal voltage gain and phase shir t vs. frequency test circuit for reference impedance figure 13. reference impedance vs. frequency test circuit for pulse response, ik=1ma figure 14. pulse response
ts431 taiwan semiconductor document number: ds_p0000235 8 version: h15 typical performance characteristics (continue) the areas under the curves represent conditions tha t may cause the device to oscillate. for curves b, c, and d, r2 and v+ were adjusted to establish the initial v ka and i ka conditions with c l =0. v batt and c l then were adjusted to determine the ranges of stability. test circuit for curve b, c and d figure 15. reference impedance vs. frequency
ts431 taiwan semiconductor document number: ds_p0000235 9 version: h15 characteristics curves (t c = 25c unless otherwise noted) fig ure 16. reference voltage vs. temperature fig ure 17. reference current vs. temperature figure 18. cathode curre nt vs. cathode voltage
ts431 taiwan semiconductor document number: ds_p0000235 10 version: h15 package outline dimensions (unit: millimeters) sot-23 suggested pad layout (unit: millimeters) marking diagram 1 = device code x = tolerance code ( a = 1%, b = 0.5%, blank = 2%) y = year code m = month code for halogen free product o =jan p =feb q =mar r =apr s =may t =jun u =jul v =aug w =sep x =oct y =nov z =dec l = lot code
ts431 taiwan semiconductor document number: ds_p0000235 11 version: h15 package outline dimensions (unit: millimeters) sop-8 suggested pad layout (unit: millimeters) marking diagram y = year code m = month code for halogen free product o =jan p =feb q =mar r =apr s =may t =jun u =jul v =aug w =sep x =oct y =nov z =dec l = lot code
ts431 taiwan semiconductor document number: ds_p0000235 12 version: h15 package outline dimensions (unit: millimeters) to-92 package outline dimensions (unit: millimeters) to-92 ammo pack marking diagram x = tolerance code ( a = 1%, b = 0.5%, blank = 2%,) y = year code m = month code for halogen free product o =jan p =feb q =mar r =apr s =may t =jun u =jul v =aug w =sep x =oct y =nov z =dec l = lot code
ts431 taiwan semiconductor document number: ds_p0000235 13 version: h15 notice specifications of the products displayed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any erro rs or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, to any intellectual property rights is granted by this document. except as provided in tscs terms and co nditions of sale for such products, tsc assumes no liability wh atsoever, and disclaims any express or implied warr anty, relating to sale and/or use of tsc products includi ng liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, cop yright, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applica tions. customers using or selling these products for use i n such applications do so at their own risk and agr ee to fully indemnify tsc for any damages resulting from such i mproper use or sale.

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