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Inqury for 2KW BUCK PFC

Patrick Zeng
Intellectual 1090 points
Other Parts Discussed in Thread: UCC29910A, UCC25600, UCC28180, UCC28950

Hi Team,

  My customer is looking for 2kW BUCK PFC solution. The spec is 220VAC input and 200VDC output. 

  Can UCC29910A be implemented in such appliations? Thanks.

Regards,

Patrick

  • 0
    TI__Mastermind 40350 points

    Hello Patrick,

    I'll direct your question to the appropriate engineers to address it.

    Regards,

    Ulrich

  • 0 in reply to Ulrich Goerke
    TI__Intellectual 1090 points

    Hi Ulrich,

      Thanks for the support. Please let me know if there's any update.

    Regards,

    Patrick

  • 0 in reply to Patrick Zeng
    TI__Mastermind 25570 points

    Hi Patrick

    The UCC29910A is well suited to buck PFC applications in the 90W or less range but I'm afraid that I couldn't reccomend it for a 2kW application like this. There are a couple of reasons for this.

    First, the output voltage from the UCC29910A buck converter is fixed at 84V - there is some flexibility in this value but not much (±5% or so)

    Second, By its nature the output voltage of a buck converter has to be lower than its input. At 220Vac in and 200Vdc out the buck converter will convert for about 50% of the time (when Vin > Vout). This will severely reduce the power factor achievable - I don't have the calculation here but the system will be on the borderline of achieving 0.9PF.

    the Buck PFC, by its nature is not well suited to providing significant hold up time.

    At 2kW we would normally recommend an interleaved boost PFC usign a UCC28970 with a second step down stage - an LLC stage using the UCC25600 for example.

    Hope this helps

    Regards
    Colin

  • 0 in reply to Colin Gillmor
    TI__Intellectual 1090 points

    Hi Colin,

      Thanks for the support. Now customer is evaluating UCC28180(with our TI Design) + UCC28950 for their design.

    Regards,

    Patrick