M54133FP Renesas Electronics Corporation., M54133FP Datasheet - Page 8

• Manufacturer Part Number: M54133FP
• Description: Earth Leakage Current Detector
• Manufacturer: Renesas Electronics Corporation.

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 V
(1) Fig.1 shows characteristics of circuit current I
(2) Rectification for use of commercial AC line as power source.
2. Resistor (R = 180k ) at I
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 V
4. Avoid SCRT output pin voltage from falling negative below GND level.
Rev.1.0, Sep.16.2003, page 8 of 17
(3)For use of common DC power supply, set supply voltage V
equivalent circuits.) To design power supply, adapt it to IC, considering I
a) For V
b) Escalated temperature may decrease supply voltage to produce large current I
of 15V.)
Z
, select zener diode of 12V or less. (Prevent supply voltage V
S
REF
COMMERCIAL
(mA)
pin
I
S
AC LINE
3
2
1
0
Fig. 1 CHARACTERISTICS OF V
S
. (I
S
characterizes clamp circuit shown in INPUT/OUTPUT
V
S
+85 C
(V)
12
S
S
of [16] pin , V
within range of 7 to 12V.
13
R
14
V
S
S
Z
TO I
15
S
from exceeding absolute maximum rating
+25 C
S
S
-20 C
CC
characteristics.
of [3] pin , and SCRT of [8] pin.
V
IC
S
S
. In this case, R
S
limits I
S
.