NJM2378D Ver la hoja de datos (PDF) - Japan Radio Corporation

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NJM2378D

PWM SWITCHING REGULATOR CONTROL IC FOR SLAVE TYPE

Japan Radio Corporation  

■ TYPICAL APPLICATIONS

Synchronous mode with NJM2368

NJM2378

8

7

6

5

8

7

6

5

VOUT1

VOUT2

1

2

3

4

NJM2368

1

2

3

4

NJM2378

External pulse mode

V+

Duty 50%

Input Pulse

0.5V

0.5V

GND

CIN

GND

Rsf

Rsr Cs

8

VREF

U.V.LO

0.52V

ER⋅AMP

7

6

30uA

L.O

PWM

S.C.P

1

2

3

CLP

Rf

5

D1

500Ω

N1

N2

L

COUT

4

Q1

*100kΩ

VOUT

R1

R2

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.

Ver.2004-03-03

-5-

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