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| ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 1 adjustable precision shunt regulator ? description ? features the ET432 is a three-terminal adjustable shunt regulator series with a guaranteed thermal stability over applicable industrial temperature ranges and wide operating current(up to 100ma).the output voltage between 1.24 and 18 volts by selection of two external divider resistors. the ET432 have a typical output impedance of 0.2 . active output circuitry provides a very sharp turn-on characteristic, making the apl431l excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies . ? precise reference voltage to 1.24v . ? 0.2 typical output impedance. ? sink current capability, 80ua to 100ma. ? temperature range -40 to 125 o c. ? adjustable output voltage vref to 18v ? quick turn-on. ? sot-23,to-92,sot-89,sot-23-5 packages ? reference voltage tolerance at 25c -0.5% ET432a -1% ET432b -1.5% ET432c ? symbol ? applications ? precision voltage reference ? linear regulator ? adjustable power supply ? switching power supply ? instrumentation ? computer disk drivers ? pin description
ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 2 ? ordering information pin assignment part number accurate temperature package r a c packing ET432aai sot-23 1 3 2 tape & reel ET432aei to-92 1 2 3 tape & box ET432adi sot-89 1 2 3 tape & reel ET432abi 0.5% sop-23-5 1 2 3 tape & reel ET432bai sot-23 1 3 2 tape & reel ET432bei to-92 1 2 3 tape & box ET432bdi sot-89 1 2 3 tape & reel ET432bbi 1% sop-23-5 1 2 3 tape & reel ET432cai sot-23 1 3 2 tape & reel ET432cei to-92 1 2 3 tape & box ET432cdi sot-89 1 2 3 tape & reel ET432cbi 1.5% -40 o c~+125 o c sop-23-5 1 2 3 tape & reel ? absolute maximum ratings symbol parameter value unit v ka cathode voltage 18 v i k cathode current range(continuous) 100 ma i ref reference input current range 3 ma t oper. operating temperature range -40~+125 o c t j junction temperature range -40~+150 o c t stg storage temperature range -65~+150 o c ? thermal characteristics symbol parameter package typical value unit sot-23 416 to-92 250 sot-89 250 ja thermal resistance from junction to ambient in free air. (measured with the component mounted on a high effective thermal conductivity test board in free air.) sot-23-5 357 o c/w ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 3 ? electrical characteristics (t a =25 c, v ka =v ref , i k =10ma unless otherwise noted . ) symbol parameter test condition min. typ. max. unit 0.5% 1.234 1.240 1.246 1% 1.228 1.240 1.252 v ref reference input voltage v ka =v ref , i k =10ma 1.5% 1.223 1.240 1.258 v v ref(dev) deviation of reference input voltage over full temperature range t min Qt a Qt max - 10 25 mv v ref / v ka ratio of change in v ref to change in cathode voltage v ka =v ref to 18v - -1 -2.7 mv/ v i ref reference input current r 1 =10k , r 2 = - 0.25 0.5 ua i ref(dev) deviation of reference input current over full temperature range r 1 =10k , r 2 = - 0.05 0.3 ua i k(min) minimum cathode current for regulation v ka =v ref - 60 80 ua i k(off) off-state cathode current v ka =18v, v ref =0 - 0.04 0.5 ua z ka dynamic impedance i k =1ma to 100ma f Q1.0khz - 0.2 0.4 ? test circuit ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 4 ? test circuit (continued) ? typical application circuits notes for typical application circuits: 1. for the series regulator applicatio ns, add a compensation capacitor c 1 between cathode and ref is strongly recommended to improve the stability of output voltage. 2. set vo according to the following equation: vo=v ref (1+r 1 /r 2 )+i ref xr 1 . 3. choose the value for r b as below: b (1). the maximum limit for r b should be such that the cathode current (i b k ) is greater than the minimum operating current (80ua) at v in(min) . (2). the minimum limit for r b should be such that the cathode current (i b k ) does not exceed 100ma under all load conditions, and the instantaneous turn-on value for i k does not exceed 120ma. ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 5 ? typical characteristics ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 6 ? typical characteristics (continued) ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 7 ? typical characteristics (continued) ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 8 ? package information sot-23 ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 9 ? package information to-92 ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 10 ? package information sot-89 ET432 www.estek.com.cn copyright @ estek electronics co., ltd version 0.1 12 oct 2011 11 ? package information sot-23-5 |
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