深圳市中立信电子科技有限公司

1 Features

1• 100-μA Typical Starting Supply Current

• 500-μA Typical Operating Supply Current

• Operation up to 1 MHz

• Internal Soft Start

• Internal Fault Soft Start

• Internal Leading-Edge Blanking of the Current

Sense Signal

• 1-A Totem-Pole Output

• 70-ns Typical Response from Current-Sense to

Gate Drive Output

• 1.5% Tolerance Voltage Reference

• Same Pinout as UC3842 and UC3842A

2 Applications

• Switch Mode Power Supplies (SMPS)

• DC-to-DC Converters

• Power Modules

• Industrial PSU

• Battery-Operated PSU

3 Description

The UCCx80x family of high-speed, low-power

integrated circuits contain all of the control and drive

components required for off-line and DC-to-DC fixed

frequency current-mode switching mode power

supplies with minimal parts count.

These devices have the same pin configuration as

the UCx84x family, and also offer the added features

of internal full-cycle soft start and internal leadingedge

blanking of the current-sense input.