UCC2960, UCC3960 Datasheet - Unitrode

UCC2960 Primary-Side Startup Controller

Figure 1 The UCC3960 primary-side startup controller is a unique solution that provides all the primary-side functions required for a single-ended, isolated offline, switch-mode power converter that uses secondary-side PWM control. It is usable with a wide range of secondary circuits and is especi.

ą D Operates With Secondary-Side PWM Control D Receives Isolated PWM Command Through a Pulse-Edge-Transformer D Initial Free-Running Soft-Start Up 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) D Overcurrent Protection D Undervoltage Lockout with 2-V Hysteresis D Low-Current Startup UCC2960, UCC3960 PRIMARYĆSIDE STARTUP CONTROLLER SLUS430A APRIL 1999 REVISED DECEMBER 2000 typical operating ci.

UCC2960 Features

* such as output current sharing and synchronous rectification are implemented more easily. The UCC3960 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 that is synchronizable to the sec

UCC3960-Unitrode.pdf