©2002 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.0

Features

• Internal Regulator Provides a Stable 5V Reference Supply

Trimmed to 5%

• Uncommitted Output TR for 200mA Sink or Source

Current

• Output Control For Push-Pull or Single Ended Operation

• Variable Duty Cycle By Dead Time Control (Pin 4)

Complete PWM Control Circuit

• On-Chip Oscillator With Master or Slave Operation

• Internal Circuit Prohibits Double Pulse at Either Output

Description

The KA7500B is used for the control circuit of the PWM

switching regulator. The KA7500B consists of 5V reference

voltage circuit, two error amplifiers, a flip flop, an output

control circuit, a PWM comparator, a dead time comparator

and an oscillator. This device can be operated in the

switching frequency of 1kHz to 300kHz.

16-DIP

16-SOP

1

1

Internal Block Diagram

KA7500B

SMPS Controller