M54125L Datasheet, PDF (1/11 Pages) Mitsubishi Electric Semiconductor – EARTH LEAKAGE CURRENT DETECTOR

M54125L
Earth Leakage Current Detector
REJ03F0033-0100Z
Rev.1.0
Sep.16.2003
Description
The M54125L is a semiconductor integrated circuit having the functions of an amplifier for use with high-speed
ground-fault breakers.
Features
• Satisfies JIS C 8371
• Good temperature characteristic of the input sense current (VLKT = 9 mV)
• Internal neutral line open-phase (N open) detection function
• Few external components
• Good stability with respect to noise, surges
• Broad operating temperature range (Ta = –20 to 80°C)
Applications
• High-speed ground-fault breakers
Summary of functions
The M54125L is an integrated circuit used in the amplification unit of a high-speed ground-fault breaker, and consists
of a differential amplifier, one-shot circuit, output circuit, constant-current circuit, waveform-shaping circuit, and delay
circuit. Operation is explained below, based on the block diagram, application example, and operating waveforms.
Block diagram
Rev.1.0, Sep.16.2003, page 1 of 10