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WEBENCH® Tools/UCC28C45-Q1: Output voltage error, when using current-mode PWM controllers in flyback applications

Michael Haar
Prodigy 10 points
Part Number: UCC28C45-Q1
Other Parts Discussed in Thread: UCC28730, TL431

Tool/software: WEBENCH® Design Tools

I'm trying to find suitable components for a 85-440VAC automotive flyback converter, with a single +12V/0.6A output. The Webench power designer suggested various designs based on the following parts:

  • UCC28C4x,
  • UCC2813-x,
  • or UCC28730 (not suitable because of the 700V startup switch!?)

The AN-22 application note from Power Integrations Inc. states that the output regulation (error) depends on the feedback technique. For example:

  • Primary regulated: +-10%
  • Opto/Zener: +-5%
  • Opto/TL431: +-5%

What output error should be expected when using current-mode PWM controllers such as the ones mentioned above?

  • 0
    TI__Mastermind 31580 points

    Hi Michael,

    The UCC28C4x and UCC2813-x devices are normally used in secondary side regulated designs which use a TL431 and opto-coupler to feedback the error signal.

    In these designs it should be possible to get better than +/-5% total regulation of the output voltage, typical load regulation only should be about +/-1%.

    Regards

    Peter