low voltage(1.24v) adjustable precision shunt regulator tl432/ a / c ordering information function block diagram jan, 2004 - rev 01 htc 21 package tl432-asf device marking to-92 sot-23 432 tl432-a tl432-a tl432-c tl432-c tl432-csf reference cathode anode reference(r) anode(a) cathode(k) programmable precision references the TL432A is a three-terminal shunt voltage reference providing a highly accurace 1.24 v, 1.25v bandgap reference with 1.0 % tolerance. the TL432A thermal stability and wide operating current (100ma), makes is suitable for all variety of applications that are looking for a low cost solution with high performance. the TL432A is an ideal voltage reference in an isolated feed circuit for 3.0v to 3.3v switching mode power supplies. features low voltage operation : 1.24 v programmable out voltage to 15v sink current capability of 1 ma to 100 ma equivalent full-range temperature coefficient of 50 ppm/ temperature compensated for operation over full rated operating temperature range trimmed bandgap to 5% esd protection : 2kv application shunt regulator voltage monitoring current source and sink circuits anolog and digital circuits requiring precision references low out voltage (3.0v to 3.3v) switching power supply error amplifier 1.24v ref + - to-92 (to p view) 1.reference 2.anode 3 . cathode 1.reference 3.cathode sot-23 (front view) 2.anode
low voltage(1.24v) adjustable precision shunt regulator tl432/ a / c e q uivalent schematic all com p onent values are nominal recommended operating conditions dissipation rating table1-free-air temperature jan, 2004 - rev 01 htc 22 sot-23 230? 122? symbol v ka i k - above t a =25 power rating t a =70 cathode voltage cathode current package power rating power rating 398? 149? - - characteristic v ? min. unit max. - v ref 1 t a =25 t a =85 derating factor 15 100 to-92 sot-89 770? t a =125 6.2?/ - 491? power rating -- 1.8?/
low voltage(1.24v) adjustable precision shunt regulator tl432/ a / c absolute maximum ratings (full operating ambient temperature range applies unless otherw ise noted) TL432A/c electrical characteristics (t a =25, unless otherwise specified) htc 1.252 1.247 1.228 1.233 v unit ? TL432A tl432c characteristic cathode voltage continuous cathode current range reference input current range i ka v ka rating 1.24 ratio of change in reference input voltage full temperature range v ka =1.25v to 14.5v v ref /v ka ? 80 0.05 ? 60 0.3 reference input current 23 dynamic impedance v ka =v ref, i k =0.1?~20?, f1.0? current for regulation off-state cathode minimum cathode current v ka =15v, v ref =0 to the change in cathod voltage temperature range input current over full deviation of reference r1=10?, r2=, ta = full ran g e vka=vref r1=10?, r2= deviation of reference 100 symbol v ka =v ref , i k =10? t a =full range input voltage over 1 1.0 ? ? -65~+150 ?/v 2.7 0.5 t stg 0 ~70 p d 15 min. ? 10 25 unit v max. typ. v ka =v ref , i k =10? ? 0.5 ? 0.04 0.2 0.4 v ref /t i ref v ref z ka i ka min i ref i ref /t i ka off symbol t j operating temperature characteristic test condition 770 t opr -0.05 ~ 3 ? -40 ~ 150 reference input voltage storage temperature total power dissipation junction temperature
low voltage(1.24v) adjustable precision shunt regulator tl432/ a / c fig. 1 test circuit for v ka =v ref fig. 2 test circuit for v ka v ref fig. test circuit for i ka off) jan, 2004 - rev 01 htc 24 input v ka i ka v ref dut i ka(off) dut v ka input 1 uf input v ka i ka v ref dut ref v ka =v ref (1+r1/r2)+i ref r1 r1 r2
low voltage(1.24v) adjustable precision shunt regulator tl432/ a / c the deviation parameters v ref(dev) and i ref(def) are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. the av erage 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 =1190? at 30, maximum v ref =1262? at 0, v ref =1241? at 25, t a =125 for tl431c because minimum v ref occurs at the lower temperature, the coefficient is positive. calculating dynamic impedance the dynamic impedance is defined as : when the device is operating with two external resistors (see f igure 3), the total dynamic impedance of the circuit is given by : jan, 2004 - rev 01 htc 25 125 7.2? 1241? x10 6 v ref = ~ 46ppm/ x10 6 v i(dev) v ref at 25 v ref t a ppm = v i 1+ r1 r2 z'= ~z ka v ka i ka z ka = t a v i(dev) maximum v ref minimum v ref ~ ~
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