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VG54123L/P Earth Leakage Current Detector
Ver2.1
Specification
2
Product Overview
Description
VG54123L/P is a semiconductor integrated circuit with amplifier for a high-speed earth leakage
circuit breaker. VG54123L/P is completely compatible with the M54123L.
Features
Wide temperature range (-20℃ ~ +80℃）
Good temperature characteristics of sensitivity current
High input sensitivity (V
T
= 6.1mV Typ.)
Low external component count
High noise and surge-proof
Low power demission (P
d
= 5mW Typ.)
May be used both as 110V and 220V
SIP8 (VG54123L), DIP8 (VG54123D), SOP8 (VG54123P)
Function
The VG54123 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 transformers (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.
Pin Function
Pin
1
2
3
4
5
6
7
8
Symbol
V
R
IN
GND
OD
SC
NR
OS
V
S
Pin Function
Reference voltage
Input
Ground
Differential amplifier output
Latch input
Terminal and noise absorption
Output
Supply voltage
VG54123L/P Earth Leakage Current Detector
Ver2.1
Specification
3
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