UCC2891DR

??电流模式有源钳位PWM控制器 CURRENT-MODE ACTIVE CLAMP PWM CONTROLLER

DESCRIPON

The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies. The UCC289x is a peak current-mode, fixed

frequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.

FEATURES

Ideal for Active Clamp/Reset Forward, Flyback Converters

Provides Complementary Auxiliary Driver with Programmable Deadtime Turn-On Delay between AUX and MAIN Switches

Peak Current-Mode Control with Cycle-by-Cycle Current Limiting

110-V Input Startup Regulator on UCC2891/3

TrueDrive™ 2-A Sink, 2-A Source Outputs

Accurate Line UV and Line OV Threshold

Programmable Slope Compensation

1.0-MHz Synchronizable Oscillator

Precise Programmable Maximum Duty Cycle

Programmable Soft Start

APPLICATIONS

150-W to 700-W SMPS

High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters

Server, 48-V Telecom, Datacom

High Power Adapter, LCD-TV and PDP-TV