TEMPERATURE DETECTING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To output a signal before operating a thermal shut down. SOLUTION: In a detecting circuit for temperature, a reference voltage VR1 is generated by dividing a band gap voltage VR0 by resistors R1 and R2 and a reference voltage VR2 is generated by dividing the voltage VR0 by resistors R5 and R6. The reference voltages VR1 and VR2 and voltages V1 and V2 varying in voltage corresponding to a thermal characteristic of a diode D are compared respectively by comparators CA and CB. Signals related to temperatures in two stages are output by turning on transistors QA and QB according to compared results by the comparators CA and CB.