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UCC2960 Datasheet Primary-side Startup Controller

Manufacturer: Unitrode

Overview: 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.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

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 especially well suitable for systems where sophisticated handling of overload conditions is required.

Secondary-side control assumes that output voltage and current measurements are interfaced directly to an output ground-referenced PWM stage that develops the power switch command for the supply.

Key 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 secondary-side PWM signal and also has the ability to accept start/stop PWM commands from the isolating pulse edge transformer. The use of an extremely small and low-cost pulse transformer allows for hig.

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