M54125L Datasheet, PDF (1/6 Pages) Mitsubishi Electric Semiconductor – EARTH LEAKAGE CURRENT DETECTOR

MITSUBISHI <CONTROL / DRIVER IC>
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.
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)
APPLICATION
High-speed earth-leakage circuit breakers
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.
PIN CONFIGURATION (TOP VIEW)
Capacitor MM →← 1
Output OUT ^{← 2}
GND ³
NC 4
Capacitor CTD TD →← 5
NC 6
Capacitor CWF WF →← 7
Input IBL → 8
External resistor RX → 9
NC 10
NC 11
VS 12
Input ILK → ¹³
Bias voltage VB 14
Outline 14P5A
N.C: no connection
Input ILK → 1
Bias voltage VB 2
Capacitor MM →← 3
Output OUT ← 4
GND 5
10 VS
9 ← RX External resistor
8 ← IBL Input
7 →← WF Capacitor CWF
6 →← TD 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)
Voltage
regulator
Bias
current
source
Comparator
VBLT
Wave-
form
regulator
VCC
VB
A • VLKT
A
Amplifier
Comparator
One-shot
multi vibrator
(13) (14)
1
2
ILK VB
Input Bias
M54125L/P
(1)
3
MM
Capacitor
Delay
circuit
Output
circuit
(2)
4
OUT
Output
(3)
5
GND