DESCRIPTION
●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
