1 description the ap432c is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. the output voltage can be set to any value betwe ref (approximately 1.24 v) to 8v with en v two external resistors. this device has a typical output impedance of 0.30 ? . active output circuitr y provides a very sharp turn on characteristic, making this device excellent replacement for zener diodes in many applications. the ap432c is characterized for operation from 0 o c to 105 o c, and four package options (sot-23 and to-92) allow the designer the opportunity to select the proper package for their applications. features low voltage operation (1.24v) adjustable output voltage v 0 =v ref to 8v wide operating current range 60 a to 100ma low dynamic output impedance 0.30 ? (typ.) trimmed bandgap design up to + 0.5%. esd rating is 2.5kv( per mil-std-883d) rohs compliant and 100% lead (pb)-free. pin configuration sot -23-3 (top view) to-92 (top view) application linear regulators adjustable supplies switching power supplies battery operated computers instrumentation computer disk drives ordering information adva nced power electronics corp. adjustable precision shunt regulator ap432c this datasheet contains new product information. advanced power electronics corp. reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. ap432cx-x n : sot-23 t : to-92 b : 1% a : 0.5% 20130108v3.1 h alogen f ree p rod uct
2 absolute maximum rating parameter symbol maximum units cathode v oltage v ka 8 v continuous cathode current i ka 150 ma reference current i ref 3 ma operating junction temperature range t j 150 c storage temperature range t stg -45 to 150 c 230 (sot-23-3) thermal resistance ja 220 (to-92) c/w lead temperature (soldering) 10 seconds t lead 260 c electrical characteristics parameter symbol test conditions & circuit min typ max unit 1.0% 122 8 124 0 1252 reference voltage v ref test circuit #1 v ka = v ref , i ka = 10ma mv deviation of reference voltage over full temperature range v i(dev) test circuit #1 v ka = v ref , i ka = 10ma, t a = 0c - 105c -- 10 25 mv ratio of change in reference voltage to the change in cathode voltage v ref / vka test circuit #2 i ka = 10ma, v ka = 8v to v ref -- -1.0 -2.7 mv/v reference current i ref test circuit #2 i ka = 10ma, r1=10k
, r2 = -- 0.15 2 a deviation of reference current over full temperature range i i(dev) test circuit #2 i ka = 10ma, r1=10k
, r2 = t a = 0c - 105c -- 0.10 0.50 a minimum cathode current for regulation i min test circuit #1 v ka = v ref -- 60 100 a off-state cathode current i off test circuit #3 v ka = 8v, v ref = 0 -- 0.04 0.8 a dynamic impedance | z ka | test circuit #1 i ka = 100 a - 80ma, v ka = v ref , f 1khz -- 0.30 1
note 1: upon customer request. adva nced power electronics corp. ap432c 0.5% 1233 1240 1246
3 typical performance characteristics cathode current vs cathode voltage -150 -100 -50 0 50 100 150 -1.5 -1 -0.5 0 0.5 1 1.5 cathode voltage (v) cathode current (ma) reference volgate vs temperature ?
4 stability boundary condition 0 20 40 60 80 100 0.001 0.01 0.1 1 cl ( uf) ika (ma) vka=vref (1.24v) vka=2v vka=3v the areas under the curves represent conditions that may cause the device to oscillate. for v ka = 2v and 3v curves, r2 and v bat were adjusted to establish the initial v ka and i k conditions with cl = 0. v bat and c l then were adjusted to determin e the ranges of stability. as the graph sugg ested, ap432c is unconditional sta ble with i k from 0 to 100ma and with c l from 0.001uf to 1uf. a d v a n ced p o w e r electro n i cs c o rp . ap432c
5 block diagram + - vref ref cathode anode symbol diagram cathode ref anode test circuits v vref input ka i ka v vref input ka i ka iref r1 r2 = vref (1+ v ka r1 r2 ) + iref x r1 v input ka i off test circuit 1: v ka = v ref test circuit 2: v ka > v ref test circuit 3: off state current application circuit v vref v out r1 r2 in r gnd ap432c = vref (1+ v out r1 r2 ) adva nced power electronics corp. ap432c
advanced power electronics corp. ap432c marking information sot-23 to-92 6 part number : rh date code : ss ss:2004,2008,2012? ss :2003,2007,2011? s s:2002,2006,2010? ss :2001,2005,2009? rhss 432c ywws part number date code (ywws) y : last digit of the year ww : weak s : squence
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