UCC3961, UCC2961 Datasheet - Unitrode

UCC3961 Advanced Primary-Side Startup Controller

The UCC3961 advanced primary-side startup controller is a unique solution that provides all the primary-side functions required for a single-ended, isolated, switch-mode power converter incorporating secondary-side PWM control. It is usable with a wide range of secondary control circuits and is espe.

ą UCC2961, UCC3961 ADVANCED PRIMARYĆSIDE STARTUP CONTROLLER D Operates with Secondary Side PWM Control D Isolated PWM Command through a Pulse Transformer D Initial Free-Running Soft-Startup with Duty-Cycle Clamping D Up to 400-kHz Synchronizable Switching Frequency D High-Current FET Drive (1.5-A Sink, 0.75-A Source) SLUS431A MAY 2000 REVISED DECEMBER 2000 D Multi-Mode Overcurrent Protection with Restart, Latching, or Cycle-by-Cycle Current Limiting D Programmable V.

UCC3961 Features

* such as output current sharing and synchronous rectification are implemented more easily. The UCC3961 provides all the circuitry required on the primary side of a secondary-side controlled power supply. It features a free running 60-kHz to 360-kHz oscillator which is synchronizable to the secondary-

UCC2961-Unitrode.pdf