M5174P

MITSUBISHI LINEAR ICs M5174P FLAME DETECTOR DESCRIPTION Monolithic integrated circuit M5174P is designed for the use of the flame detection circuil. It is composed of current amplifiers, a thyristor circuit, a couple of the relay drivers and a internal voltage regulator. The current limiting circuit of the driver and internal two sets of shunt circuits parallely connected with relay protect the relay against the danger in an abnormal state of no signal flame. A differential amplifier configuration and a temperature-independent reference voltage source minimize the variation of the operating threshold level of the flame current detector. FEATURES Fail-safe system (The operating mode of two degrees of redundancy.) Available input flame current ...................... 50,uA(max.) Minimumtollelance for operating threshold input current ........................................... ±20%(Ta=-20-+60°C) APPLICATION Flame detection circuit for a gaseous appliance PIN CONFIGURATION...