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UCC28070: Question about the reference design PR780

Lenna Yan
Intellectual 1960 points
Part Number: UCC28070

Hi Expert,

We have a 1.2kW reference design PR780, I could find a document that introduce the design. Do you have a description about the function of the below circuit in detail?

https://www.ti.com/lit/df/slur033/slur033.pdf?ts=1597051579494&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FPR779%253FkeyMatch%253DPR780%2526tisearch%253DSearch-EN-everything

  • 0
    TI__Mastermind 34465 points

    Hello Lenna,

    The UCC28070 is an interleaved pfc controller and that means the load power is equally divided between the two phases.
    If you wish to make the UCC28070 into a single phase non-interleaved controller you will need to adjust the IMO resistor value .

    For single phase operation R2 and R11 set the power capability of the pfc.
    For interleaved operation R2 sets the power capability of the pfc.

    Regards

    John