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NJM2392

PWM DC/DC Converter IC

Japan Radio Corporation  

NJM2392

PWM DC/DC Converter IC

■GENERAL DESCRIPTION

The NJM2392 is a PWM DC/DC converter IC.

It features fixed frequency type PWM control for better noise

handling and to avoid intermittent oscillation observed in a

simplified controller.

It is suitable for Step-Up, Step-Down and Inverting applications.

In addition, it contains a pulse-by-pulse current limit circuit

and can be set by an external resistance.

■PACKAGE OUTLINE

NJM2392D

NJM2392M

■FEATURES

● Operating Voltage

3.0V to 40V

● Wide Oscillator Frequency

1kHz to 150kHz

● Internal High Power Transistor 1.5A max.

● Internal Over Current Limit Circuit

● PWM switching control

● Bipolar Technology

● Package Outline

NJM2392D

: DIP8

NJM2392M

: DMP8

■PIN CONFIGURATION

■BLOCK DIAGRAM

1

8 PIN FUNCTION CS 1

1. CS

2

7 2. ES

3. CT

1.5A

3

6 4. GND

5. IN-

160Ω

4

5 6. V+

ES 2

NJM2392D

NJM2392M

7. SI

8. CD

OSC Block

MAX

ON Duty

9:1

Q

R

PW M

Logic

S

Ipk Sense

300mV

8 CD

7 SI

CT 3

Vref

1.25V

Error AMP

6 V+

PWM COMP

GND 4

Buffer

5 IN-

Ver.2008-08-29

-1-

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