H431AA

The H431AA is a series of three-terminal adjustable regulators with guaranteed thermal stability over applicable tem perature ranges.The output voltage may be set to any value between VREF (approximately 2.495 volts)and 36 volt s with two external resistors. The H431AA has a typical dynamic output impedance of 0.2.Active output circuitry provides a very sharp turn-on characteristic,and make the device distingctive replacement for zener diodes in many ap plications.

Features of the H431AA are:(1)programmable output voltage;(2)temperature coefficient is 50ppm/°C typical;(3)tem perature compensated for operation over;(4)full temperature range;(5)low output noise voltage;(6)fast turn on res ponse.

The absolute maximum ratings and electrical characteristics(Ta=25°C) of the H431AA can be summarized as:(1):ca thode voltage is 37 V;(2):cathode current range (continuous) is -100mA to+150 mA;(3):reference input current rang e is 0.05 mA to+10 mA;(4):power dissipation is 770 mW; (5):operating temperature range is 0°C+70 °C;(6):sto rage temperature range is -65°C+150 °C.electrical characteristics:(1):reference input voltage is 2.445 V min, 2.495 V typ and 2.545 max when VKA is VREF and IK is 10mA;(2):deviation of reference input voltage over-temperature is 4mV typ and 17mV max when VKA is VREF, IK is 10mA and Ta is between Tmin and Tmax;(3):ratio of change in refer ence input voltage to the change in cathode voltage is -1.4mV min and -2.7 max when IK is 10mA and KKA is 10V-VrEF;(4):reference input current is 2uA typ and 4uA max when IK is 10mA, R1 is 10k and R2 is ;(5):minimum cath ode current for regulation is 0.4mA typ and 1.0mA max when VKA is VREF.etc.