MITSUBISHI
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
DESCRIPTION
The M54125 is a semiconductor integrated circuit consisting of an amplifier for high-speed earth leakage circuit breaker.
PIN CONFIGURATION (TOP VIEW)
Capacitor MM → ← 1
FEATURES
q Satisfies JIS C 8371 q Temperature-stable input current trigger threshold (VLKT = 9mV) q Capable of detecting a lost phase on the neutral line q Economical, low external component count q Highly resistant to noise and power surges q Wide operating temperature range (Ta = -20 – +80°C)
Output OUT ← 2 GND NC Capacitor CTD 3 4
← 5 TD →
NC 6
M54125L
Capacitor CWF Input
← 7 WF →
IBL → 8 RX → 9 NC 10 11 12
APPLICATION
High-speed earth-leakage circuit breakers
External resistor
FUNCTION
The M54125 is a semiconductor integrated circuit for use in the amplifier section of earth-leakage circuit breakers. It consists of a differential amplifier, one-shot circuit, output circuit, current regulator, waveform regulator and delay circuit. The following description refers to the block diagram, application example, and operational waveforms.
Input Bias voltage
NC VS
ILK → 13 VB 14
Outline 14P5A
Input Bias voltage ILK → 1 VB 2 10 VS
N. C: no connection
9 ← RX
External resistor
M54125P
← 3 Capacitor MM →
Output OUT ← 4 GND 5
8 ← IBL Input
→ WF Capacitor CWF 7 ← ← TD 6 →
Capacitor CTD
Outline 10P2-C
BLOCK DIAGRAM (Note: Pin No. in parentheses are of M54125L)
VS 10 (12) External resistor RX 9 (9) Input IBL 8 (8) Capacitor CWF WF 7 (7) Capacitor CWF TD 6 (5)
Bias current source Voltage regulator Comparator VBLT
Waveform regulator
Delay circuit
VCC
VB
A • VLKT
A Amplifier Comparator
One-shot multi vibrator
Output circuit
(13) 1 ILK Input 2
(14) 3 VB Bias
(1) 4
(2) 5 OUT Output
(3) GND
M54125L/P
MM Capacitor
MITSUBISHI
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR ABSOLUTE MAXIMUM RATINGS (Ta = -20 – 80°C unless otherwise noted)
Symbol IS IS(SO) ∆VILK VIBL VOUT Pd Topr Ts...
M54125L PDF File
