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ts432i adjustable precision shunt regulator 1/12 version: a0b to-92 sot-23 sot-25 general description the ts432i/432ai/ts432bi is a three-term inal adjustable shunt regulator with specified thermal stability. the output voltage may be set to any value between vref (approximat ely 1.24v) and 18v with two external resistors. the ts432i/432ai/ts432bi has a typi cal output impedance of 0.05 ? . active output circuitry provides a very sharp turn-on characteristic, making the ts432i/432ai/ts432bi excellent replacement for zener diode in many applications. ordering information part no. package packing ts432 x it b0 to-92 1kpcs / bulk ts432 x it a3 to-92 2kpcs / ammo ts432 x ix rf sot-23 3kpcs / 7? reel ts432 x ix5 rf sot-25 3kpcs / 7? reel note: where xx denotes voltage tolerance blank: 2% a: 1% b: 0.5% features precision reference voltage ts432i ? 1.24v2% ts432ai ? 1.24v1% ts432bi ? 1.24v0.5% minimum cathode current for regulation: 20ua(typ.) equivalent full range temp. coefficient: 50ppm/ oc programmable output voltage up to 18v fast turn-on response sink current capability of 80ua to 100ma low dynamic output impedance: 0.2 ? low output noise application voltage monitor delay timmer constant ?current source/sink high-current shunt regulator crow bar over-voltage / under-voltage protection block diagram absolute maximum rating (ta = 25 oc unless otherwise noted) parameter symbol limit unit cathode voltage (note 1) vka 18 v continuous cathode current range ik 100 ma reference input current range iref 3 ma power dissipation to-92 sot-23 sot-25 pd 0.625 0.35 0.35 w junction temperature t j +150 o c operation temperature range t oper -40 ~ +105 o c storage temperature range t stg -65 ~ +150 o c note 1: voltage values are with respect to the anode terminal unless otherwise noted. note 2: rating apply to ambient temperature at 25 o c pin definition: 1. reference 2. cathode 3. anode pin definition: 1. reference 2. anode 3. cathode pin definition: 1. n/c 2. n/c * 3. cathode 4. reference 5. anode * (pin 2 is connect to substrate and must be connected to anode or left o p en )
ts432i adjustable precision shunt regulator 2/12 version: a0b recommend operating condition parameter symbol limit unit cathode voltage (note 1) vka 18 v continuous cathode current range ik 100 ma recommend operating condition parameter symbo test conditions min typ max unit ts432i 1.215 1.264 ts432ai 1.227 1.252 reference voltage ts432bi vref vka =vref, ik=10ma (figure 1) ta=25 o c 1.233 1.240 1.246 v deviation of reference input voltage ? vref vka =vref, ik=10ma ta= full range (figure 1) -- 10 25 mv radio of change in vref to change in cathode voltage ? vref/ ? vka ika=10ma, vka = 18v to vref (figure 2) -- -1.0 -2.7 mv/v reference input current iref r1=10k ? , r2= ? iref r1=10k ? , r2= ? minimum operating cathode current ika(min) vka=vref (figure 1) -- 60 80 ua * the deviation parameters ? vref and ? iref are defined as difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. * the average temperature coefficient of the reference input voltage, vref is defined as: where: t2-t1 = full temperature change. vref can be positive or negative depending on whether vref min. or vref max occurs at the lower ambient temperature. example: ? vref=7.2mv and the slope is postive, vref=1.241v at 25 o c, ? t=125 o c * the dynamic impedance z ka is defined as: * when the device operating with two external resistors, r1 and r2, (refer to figure 2) the total dynamic impedance of the circuit is given by:
ts432i adjustable precision shunt regulator 3/12 version: a0b test circuits figure 1: vka = vref figure 2: vka > vref figure 3: off-state current additional information ? stability when the ts432i/432ai/432bi is used as a shunt regula tor, 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 devic e, optional decoupling at the load. the reason for this is that ts432i/432ai/432bi 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 lo wer the cathode voltage has been set for. therefore while the device will be perfectly stable operating at a cathode current of 10ma (approx.) with a 0.1uf capacitor across it, it will osci llate transiently during start up as the cathode cu rrent passes through the instability region. select a very low capacitance, or alt ernatively a high capacitance (10uf) will avoid this iss ue altogether. since the user will probably wish to have local decoupling at the l oad anyway, the most cost effective method is to use no capacitanc e at all directly across the devic e. pcb trace/via resistance and inductance prevent the local load decoupl ing from causing the oscillation duri ng the transient start up phase. note: if the ts432i/432ai/432bi 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 4: voltage monitor figure 5: output control for three terminal fixed regulator
ts432i adjustable precision shunt regulator 4/12 version: a0b applications examples (continue) figure 6: shunt regulator figure 7: high current shunt regulator figure 8: series pass regulator figure 9: constant current source figure 10: triac crowbar figure 11: scr crowbar
ts432i adjustable precision shunt regulator 5/12 version: a0b applications examples (continue) vin vout vref 0.74v figure 12: single-supply comparator with temperature- compensated threshold figure 13: constant current sink figure 14: delay timer
ts432i adjustable precision shunt regulator 6/12 version: a0b typical performance characteristics test circuit for voltage amplification figure 14: small-signal voltage gain and phase shift vs. frequency test circuit for reference impedance figure 15: reference impedance vs. frequency
ts432i adjustable precision shunt regulator 7/12 version: a0b typical performance characteristics the areas under the curves represent conditions that 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 a test circuit for curve b, c and d figure 16: stability boundary condition test circuit for pulse response, ik=1ma figure 17: pulse response
ts432i adjustable precision shunt regulator 8/12 version: a0b electrical characteristics figure 18: reference voltage vs. temperature figure 19: reference current vs. temperature figure 20: cathode current vs. cathode voltage
ts432i adjustable precision shunt regulator 9/12 version: a0b to-92 mechanical drawing marking diagram x = tolerance code ( a = 1%, b = 0.5%, blank = 2%,) y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code to-92 dimension millimeters inches dim min max min max a 4.30 4.70 0.169 0.185 b 4.30 4.70 0.169 0.185 c 14.30(typ) 0.563(typ) d 0.43 0.49 0.017 0.019 e 2.19 2.81 0.086 0.111 f 3.30 3.70 0.130 0.146 g 2.42 2.66 0.095 0.105 h 0.37 0.43 0.015 0.017
ts432i adjustable precision shunt regulator 10/12 version: a0b sot-23 mechanical drawing marking diagram x = device code ( d = ts432ai, e = ts432bi, f = ts432i,) 3 = sot-23 package y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code sot-23 dimension millimeters inches dim min max min max. a 0.95 bsc 0.037 bsc a1 1.9 bsc 0.074 bsc b 2.60 3.00 0.102 0.118 c 1.40 1.70 0.055 0.067 d 2.80 3.10 0.110 0.122 e 1.00 1.30 0.039 0.051 f 0.00 0.10 0.000 0.004 g 0.35 0.50 0.014 0.020 h 0.10 0.20 0.004 0.008 i 0.30 0.60 0.012 0.024 j 5o 10o 5o 10o
ts432i adjustable precision shunt regulator 11/12 version: a0b sot-25 mechanical drawing marking diagram x = device code ( d = ts432ai, e = ts432bi, f = ts432i,) 5 = sot-25 package y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code sot-25 dimension millimeters inches dim min max min max. a+a1 0.09 1.25 0.0354 0.0492 b 0.30 0.50 0.0118 0.0197 c 0.09 0.25 0.0035 0.0098 d 2.70 3.10 0.1063 0.1220 e 1.40 1.80 0.0551 0.0709 e 1.90 bsc 0.0748 bsc h 2.40 3.00 0.09449 0.1181 l 0.35 bsc 0.0138 bsc ? 1 0o 10o 0o 10o s1 0.95 bsc 0.0374 bsc
ts432i adjustable precision shunt regulator 12/12 version: a0b notice specifications of the products displa yed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. information contained herein is intended to provide a product descri ption only. no license, express or implied, to any intellectual property rights is granted by this document. exc ept as provided in tsc?s terms and conditions of sale for such products, tsc assumes no liability whatsoever, and disc laims any express or implied warranty, relating to sale and/or use of tsc products including liability or warranties re lating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. the products shown herein are not designed for use in medica l, life-saving, or life-sust aining applications. customers using or selling these products for use in9 such applications do so at their own risk and agree to fully indemnify tsc for any damages resulting from such improper use or sale.

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