M54123L Datasheet - EARTH LEAKAGE CURRENT DETECTOR

MITSUBISHI M54123L EARTH LEAKAGE CURRENT DETECTOR DESCRIPTION The M54123L is a semiconductor int...

MITSUBISHI M54123L EARTH LEAKAGE CURRENT DETECTOR DESCRIPTION The M54123L is a semiconductor integrated circuit with amplifier for a high-speed earth leakage circuit breaker. PIN CONFIGURATION (TOP VIEW) FEATURES q Suitable for JIS C 8371 q Good temperature characteristics of input sensitivity current q High input sensitivity (VT = 6.1mV Typ.) q Low external component count q High noise and surge-proof q Low power dissipation (Pd = 5mW Typ.) and may be used both as 100V and 200V. q High mounting density by SIL package with 8 pins q Wide temperature range (Ta = -20 – +80°C) Reference voltage Input VR → IN → GND 1 2 3 4 5 6 7 8 REG LATCH AMP Differential amplifier output Latch input Terminal for noise absorption Output OD ← SC → NR → OS ← VS APPLICATION High speed earth leakage circuit breaker FUNCTION The M54123L circuit for the amplifying parts of earth leakage circuit breaker consists of differential amplifier, latch circuit and voltage regulator. It is connected to the secondary side of the zerocurrent transformer (ZCT) which detects leakage current in the both input of the differential amplifier. Signals amplified by differential amplifier are integrated by an external capacitor, and connects to the input terminal of latch circuit with output suitable for the characteristics of high-speed earth leakage circuit breaker. Latch circuit keeps low in the output till the input voltage reaches the fixed level, and output becomes high when the lea...