low voltage(1.24v) adjustable precision shunt regulator tl432z/az/cz programmable precision references features low voltage operation : 1.24 v programmable out voltage to 16v sink current ca p abilit y of 1 ma to 100 m a equivalent full-range temperature coefficient of 50 ppm/ temperature compensated for operation over full rated operating temperature range trimmed bandgap to 5% moisture sensitivity level 3 application shunt regulator voltage monitoring current source and sink circuits ordering information anolog and digital circuits requiring precision references low out voltage (3.0v to 3.3v) switching power supply error amplifier description the tl432z/az/cz is a three-terminal shunt voltage reference p roviding a highly accuracy 1.24 v, 1.25v bandgap reference with 1.0 % tolerance. the tl432z/az/cz 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 tl432z/az/cz is an ideal voltage reference in an isolated feed circuit for 3.0v to 3.3v switching mode power supplies. 2008 - ver 1.0 htc ? 1 ? device marking package tl432az tl432az to-92 sot-23 tl432czsf tl432cz tl432cz TL432AZSF 432 1.reference 2.anode 3.cathode 1.reference 3.cathode 2.anode to-92 pkg sot-23 2.90*1.30*1.00
low voltage(1.24v) adjustable precision shunt regulator tl432z/az/cz function block diagram e q uivalent schematic all com p onent values are nominal htc ? 2 ? reference cathode anode reference(r) anode(a) cathode(k) 1.24v ref + -
low voltage(1.24v) adjustable precision shunt regulator tl432z/az/cz recommended operating conditions dissipation rating table1-free-air temperature absolute maximum ratings (full operating ambient temperature range applies unless otherw ise noted) htc to-92 operating temperature storage temperature 1.8?/ junction temperature i ka v ka 6.2?/ 3 491? power rating rating power rating power rating 398? derating factor 16 100 770? t opr t stg t a =125 ? min. unit max. v ref 8 20 149? - sot-23 230? t j -65~+150 characteristic cathode voltage continuous cathode current range reference input current range -40 ~ 150 100 symbol i ref 0 ~ 70 ? 3 ? v unit ? characteristic t a =25 t a =85 symbol v ka i k above t a =25 cathode voltage power rating t a =70 cathode current package v ? ? - 122? to-92 pkg = 770 sot-23 pkg = 230 total power dissipation p d
low voltage(1.24v) adjustable precision shunt regulator tl432z/az/cz tl432az/cz electrical characteristics (t a =25, unless otherwise specified) htc reference input voltage symbol i ka min i ref i ref /t i ka off characteristic test condition min. 0.15 ? 0.135 0.05 0.15 1.247 ? 125 v ka =v ref , i k =10? t a =full range 2.7 unit v max. typ. 1.24 1.252 0.5 1.0 ? ?/v vka=vref 0.15 tl432cz deviation of reference off-state cathode input voltage over current v ka =16v, 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 ? 4 ? dynamic impedance v ka =v ref, i k =0.1?~100?, f1.0 ? ? z ka ? 80 0.10 ? 20 0.4 ratio of change in reference input voltage minimum cathode r1=10?, r2= reference input current current for regulation tl432az v ka =1.25v to 14.5v v ref /v ka 1.228 1.233 v ref /t v ref full temperature range v ka =v ref , i k =10?
low voltage(1.24v) adjustable precision shunt regulator tl432z/az/cz parameter measurement information 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) typical characteristics htc ? 5 ? v ka i ka(off) dut input input v ka i ka v ref dut 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 tl432z/az/cz 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 tl432cz 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 : htc ? 6 ? 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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