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ace 432n precision adjustable shunt voltage reference ver 1. 4 1 d escription the ace432n is low - voltage three - terminal adjustable voltage references, with specified thermal stability over applicable industrial and commercial temperature ranges. output voltage can be set to any value between vref (1.24v) and 20v with tw o external resi stors. these devices have a typical output impedance of 0.25?. active output circuitry provides a very sharp turn - on characteristic, making the ace432n excellent replacements for low - voltage zener diodes in many applications, including onboard regulation a nd adjustable power supplies. features ? low - voltage operation --- down to 1.24v ? adjustable output voltage, vo=vref to 20v ? low operational cathode current --- 80ua (typ) ? 0.25 typical output impedance application ? battery power equipment ? linear regulators ? s witch power supply ? cellular phone ? digital cameras ? computer disk drivers ? instrumentation absolute maximum ratings p arameter s ymbol m ax u nit cathode voltage v z 20 v continuous cathode current i z 1 0 0 ma reference current i ref 3 ma thermal resistance jun ction to ambient sot - 23 - 5 l s ot - 23 - 3 ja 206 206 o c /w operating junction temperature t j - 40 to 150 o c storage temperature range t stg - 65 to 150 o c the ic has a protection circuit against static electricity. do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the ic.
ace 432n precision adjustable shunt voltage reference ver 1. 4 2 packaging type sot - 23 - 5 l sot - 23 - 3 5 4 3 1 2 3 1 2 ordering information ace 432 n x xx + h typical application circuit r vin vout r1 2 1 vref r2 3 gnd gnd sot - 23 - 5 l sot - 23 - 3 description 3 2 cathode 5 3 anode 4 1 ref 1.2 nc halogen - free bn : sot - 23 - 5 l bm : sot - 23 - 3 reference voltage accuracy : a : 0.5% b : 1% pb - free
ace 432n precision adjustable shunt voltage reference ver 1. 4 3 block diagram electrical characteristics parameter symbol test conditions min. typ. max. unit reference voltage 0.5% v ref v z =v ref , i z =10ma t a =25 1.234 1.24 1.246 v t a = - 40 ~80 1.222 1.258 1.0% t a =25 1.228 1.24 1.252 t a = - 40 ~80 1.215 1.265 v ref temp deviation v dev v z =v ref , i z =10ma t a = - 40 ~80 10 25 mv ratio of change in v ref t o change in cathode voltage v ref / v z i z =10ma v z = 16 v to v ref - 1.0 - 2.7 mv/v reference input current i ref i z =10ma, r1=10k, r2= 0.15 0.5 a iref temp deviation i ref( dev) i z =10ma, t a = - 40 ~80 r1=10k, r2= 0.1 0. 4 a off - state cathode current i z(o ff ) v ref =0 v z =6v 0.5 1.0 a v z =12v dynam ic output impedance r z i z = 1ma~10 0ma v z =v ref , f Q 1khz 0. 25 0.4 minimum operation current i z(min) v z =v ref 30 80 a
ace 432n precision adjustable shunt voltage reference ver 1. 4 4 application circuit figure 1. test circuit for v ka =v ref figure 2. test circuit for v ka >v ref , v o =v ka =v ref v o =v ka =v ref *1(1+r1/r2)+i ref *r1 figure 3. test circuit for i k(off) figure 4. test circuit for v ka >v ref , v o =v ka =v ref *1(1+r1/r2)+i ref *r1 ace432 n figure 5. flyback with isolation using ace432n as voltage reference and error amplifier * to improve the stability of output voltage, figure 4, a 0.1uf capacitor is recommended between cathode to anode.
ace 432n precision adjustable shunt voltage reference ver 1. 4 5 performance characteristics
ace 432n precision adjustable shunt voltage reference ver 1. 4 6 performance characteristics
ace 432n precision adjustable shunt voltage reference ver 1. 4 7 performance characteristics
ace 432n precision adjustable shunt voltage reference ver 1. 4 8 performance characteristics
ace 432n precision adjustable shunt voltage reference ver 1. 4 9 packing information sot - 23 - 5 l
ace 432n precision adjustable shunt voltage reference ver 1. 4 10 packing information sot - 23 - 3
ace 432n precision adjustable shunt voltage reference ver 1. 4 11 notes ace does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ace el ectronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instru ctions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the fai lure of the life support device or system, or to affect its safety or effectiveness. ace technology co., ltd. http://www.ace - ele.com/

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