NJM2368(2004) Ver la hoja de datos (PDF) - Japan Radio Corporation

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NJM2368
(Rev.:2004)

SWITCHING REGULATOR CONTROL IC FOR FLYBACK

Japan Radio Corporation  

NJM2368

■ TYPICAL APPLICATIONS

V+

CIN

GND

Rsf

330kΩ

RT

36kΩ

Rsr Cs

180kΩ 4.7uF

CT

1,000pF

8

VREF

U.V.LO

7

30uA

OSC

6

L.O

0.52V

ER⋅AMP

PW M

S.C.P

1

2

3

CLP

2,200pF

RNF

1MΩ

5

D1

500Ω

N1

N2

4

*100kΩ

COUT

Q1

VOUT

+5V

R2

22kΩ

2kΩ

R1

2.2kΩ

GND

When Short Circuit Protection (SCP) is activated, Output terminal (Pin 4) becomes high impedance and the external

switching transistor (Q1) is turned off.

However, small leak current from Output terminal at high ambient temperature may turn on the external switching transistor

causing malfunction of the SCP particularly when FET is used as a switching device.

To avoid this issue, insert a 100kΩ resistor between the Gate and the Source of the external transistor.

-4-

Ver.2004-06-03

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