10_V_TEMPERATURE_STABILIZED

Published:2009/7/7 5:10:00 Author:May | From:SeekIC

Self-regu lation of substrate temperature of CA3046 fivetransistor chip allows 10-V reference output voltage to rlse only 0.5 mV when temperature increases from 27 to 62℃ Circuit requires only single 15-V supply Zener-connected transistor Q2 and diode-connected transistor Q1 together provide temperature compensation by sensing voltage across Q1 (DS) and comparing it with temperature-reference voltage produced across R1 by μA741G opamp A1. Opamp drives Q5 to control current through Q4 which serves as chip heater. Opamp A2 (μA741G) and asso-ciated components (including Q1-Q2 in feedback path) act as self-regulating (zener-current) voltage reference.-M. J. Shah, A Self-Regutating Temperature-Sta bil ized Reference, EDN Maga-zine, May 20, 1974, p 74 and 76.



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