M54133FP データシートの表示（PDF） - Renesas Electronics

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M54133FP

Earth Leakage Current Detector

Renesas Electronics 

M54133FP/GP

Precaution for Application

Described below are precautions on usage of the M54133FP and the M54133GP. Note that each precaution presents a still better

example. It is advisable to review it carefully to learn optimal conditions.

1. Voltage applied to VS

(1) Fig.1 shows characteristics of circuit current IS. (IS characterizes clamp circuit shown in INPUT/OUTPUT

equivalent circuits.) To design power supply, adapt it to IC, considering IS characteristics.

(2) Rectification for use of commercial AC line as power source.

COMMERCIAL

AC LINE

RS

VS

VZ

IC

3

IS

(mA) 2

1

+85°C

+25°C

-20°C

0

12 13 14 15

VS(V)

Fig. 1 CHARACTERISTICS OF VS TO IS

a) For VZ, select zener diode of 12V or less. (Prevent supply voltage VS from exceeding absolute maximum rating

of 15V.)

b) Escalated temperature may decrease supply voltage to produce large current IS. In this case, RS limits IS.

(3)For use of common DC power supply, set supply voltage VS within range of 7 to 12V.

2. Resistor (R = 180kΩ) at IREF pin

This resistor provides constant-reference-current source for IC. (Constant current source protects IC against

fluctuations in supply voltage and ambient temperature.)

Since every circuit is characterized by resistance of this resistor, the use of high-precision resistor (accuracy of ±2%) is

recommended.

3. Laying out printed-circuit board

Foreign noise (from noise simulator, for example) may cause malfunctions.

To improve noise resistance, lay out printed-circuit patterns so that wirings of IC to additional capacitors and resistors

can be made as short as possible.

Carefully design patterns especially for wiring capacitors to VS of [16] pin , VCC of [3] pin , and SCRT of [8] pin.

4. Avoid SCRT output pin voltage from falling negative below GND level.

Rev.1.0, Sep.16.2003, page 8 of 17

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