M54128L View Datasheet(PDF) - Mitsumi

Part Name

Description

Manufacturer

M54128L

EARTH LEAKAGE CURRENT DETECTOR

Mitsumi 

MITSUBISHI <CONTROL / DRIVER IC>

M54128L/FP

EARTH LEAKAGE CURRENT DETECTOR

7. Reset time in reset circuit

This circuit is designed as a timer circuit of VL = 0.7V, VH = 2.5V

and lo = 10µA. When SCR is ON, the power supply route of the

leakage detection and abnormal voltage detection circuits are

shut off, VL does not drop to 0.7V as shown below and therefore

reset time may become shorter.

Set the reset time somewhat longer in advance.

T = C x (VH - VL) = 0.33µF x (2.4 - 0.7) = 55ms

I

10µA

OFFC pin waveform

0.7V

SCRT pin waveform

2.4V

0V

55ms

t = 10 – 20ms

3.1V

• ln the case of leakage detection :

May become 10ms (50Hz) shorter

• ln the case of abnormal voltage detection :

May become 20ms (50Hz) shorter

Note. t : time shorter than setting value

8. Application of leakage detection function to time delay

function

As shown in the figure below, by applying the neutral conductor

open-phase protection function, it is possible to provide the

leakage detection function with time delay function (several

100ms). ln this case, however, the neutraI conductor open-

phase protection function disappears. Pin No. in parentheses

are of L type.

VCC

PSAV

IBLI

TTDC

TRC1

TRC2

(Example 1)

VCC

PSAV

IBLI

TTDC

TRC1

TRC2

(Example 2)

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