Mitsubishi M54125P Datasheet

MITSUBISHI <CONTROL / DRIVER IC>

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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

●Satisfies JIS C 8371

●Temperature-stable input current trigger threshold (VLKT = 9mV)

●Capable of detecting a lost phase on the neutral line

●Economical, low external component count

●Highly resistant to noise and power surges

●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

1

Output

Input

Input

Input

TD

ILK

VB

MM

OUT

GND

MM
OUT
GND

NC

TD
NC
WF
IBL

RX
NC
NC

VS

ILK

VB

→←
←

→←

→←
→
→

→

→

→

←
←

2
3
4
5
6

M54125L

7
8

9
10
11
12
13
14

Outline 14P5A

1

M54125P

2
3
4

10

9

←
←

8

→←

7

→←

65

Capacitor

Capacitor C

Capacitor CWF

External resistor

Bias voltage

Bias voltage

Capacitor

Output

N.C: no connection

VS
RX

External resistor

IBL

Input

WF

Capacitor C
Capacitor CTD

TD

WF

BLOCK DIAGRAM (Note: Pin No. in parentheses are of M54125L)

External

VS

(12) (9) (8) (7)

Voltage

regulator

VCC

resistor Input Capacitor C

RX IBL WF TD

Bias
current
source

Comparator

VBLT

VB

A • VLKT

A

Amplifier

Comparator

Wave-

form

regulator

One-shot

multi vibrator

Outline 10P2-C

WF Capacitor CWF

678910

(5)

Delay
circuit

Output

circuit

1 2 3

ILK VB MM OUT GND

Input Bias Capacitor Output

M54125L/P

4

5

MITSUBISHI <CONTROL / DRIVER IC>

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µ

µ

EARTH LEAKAGE CURRENT DETECTOR

ABSOLUTE MAXIMUM RATINGS(Ta = -20 – 80°C unless otherwise noted

M54125L/P

Symbol

S

I
IS(SO)
∆VILK
VIBL

VOUT
Pd

Supply voltage
Supply surge current

ILK input voltage
IBL input voltage V

OUT applied voltage
Power dissipation

Parameter Conditions

Topr Operating temperature
T

stg

Note 1: I

Storage temperature

S(SG) current waveform, which is given in the following diagram, shall be one shot or less per minute.

Average supply current frequency
per cycle

(Note 1)
Pin VB serves as the voltage

reference

When external voltage is applied

IS(SG)

40

1

S

S

12mA

6mA

0mA

Ratings

0

0 – 12

-1.8

-0.3

-0.3

-20

-55

– 6

– +1.8

– 6
– 4

160

– 80

– 125

Unit

mA
mA

V

V

mW

°C
°C

RECOMMENDED OPERATING CONDITIONS(Ta = -20 – 80°C unless otherwise noted

Symbol

V

S

I

S

Supply voltage 12
Supply current

Parameter

When output OUT is OFF
Average power supply current per

cycle

CMM External capacitor MM
CWF
CTD
RX

External capacitor WF
External capacitor TD
External resistor R

X

Handling of unused pins when the abnormal voltage detection function is not used

• Pin R

X must be left open

• Pin TD must be shorted to GND

• Pin WF and pin IBL may be left open or shorted to GND

Limits

Min. Typ. Max.

5.6

0.22
1

6.8
27

Unit

V

mA

µF
µF
µF

kΩ