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UCC28065: UCC28065 on-time calculation

Isee
Expert 5300 points
Part Number: UCC28065

Do you have a formula to calculate the on-time, based on the value of Rtset and the voltages applied to the Vinac and Vcomp pins?

  • 0
    TI__Genius 10655 points

    Hello Isee.

    Thank you for your interest in the UCC28065 PFC controller. We don't publish some of this information outside of TI, but I can reduce the formula to give you what you need. In order to accomplish this, I had to boil down some internal factors to a constant (0.7). This should get you very close.

    For example: Vcomp = 5V, Rtset = 66kΩ, Vinacpk = 0.6V: Ton ~ 143.6uS.

    Regards,

    Ray