M54123L Datasheet, PDF (1/9 Pages) Mitsubishi Electric Semiconductor – EARTH LEAKAGE CURRENT DETECTOR

UTC M54123L LINEAR INTEGRATED CIRCUIT
EARTH LEAKAGE CURRENT
DETECTOR
DESCRIPTION
The UTC M54123L is a semiconductor integrated
circuit with amplifier for a high-speed earth leakage
circuit breaker.
FEATURES
*Suitable for JIS C 8371
*Good temperature characteristics of input sensitivity
current
*High input sensitivity (V_T=6.1mV Typ.)
*Low external component count
*High noise and surge-proof
*Low power dissipation (Pd=5mW Typ.) and may be
used both as 100V and 200V.
*Wide temperature range (Ta=-20~+80°C)
SOP-8
DIP-8
SIP-8
APPLICATION
*High speed earth leakage circuit breaker.
FUNCTION
The UTC 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 zero current 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 leakage current more than fixed flows.
It drives a thyristor connected to the output terminal of latch circuit.
UTC UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R122-001,B