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PFC UCC28061 issue

Prescott Siao
Intellectual 2220 points
Other Parts Discussed in Thread: UCC28061, UCC28063A

Hi team,

Could you please help review the schematic?

There are two issues.

1. there is some noise.

2. When AC-IN 110V, the PFC value is 0.95 but unstable.

    When AC-IN 120V, the PFC value is lower than 0.9.

  • 0
    TI__Expert 7395 points
    Prescott,

    Thanks for considering TI for your design.

    I don't see an attachment of a schematic. Can you use rich text formatting option in your reply and insert the schematic PDFs ?

    Also, can you describe the noise and instability in more details? Do you have any waveforms you could attach to demonstrate ?

    I'll contact the product group for this device to comment once you provide further information.

    Regards
    John
  • 0 in reply to John Stevens
    TI__Expert 7395 points
    Prescott,
    You may also consider using the UCC28063A. That is the latest and greatest in that family. It was made more robust over the different revisions and is pin to pin with UCC28061.
    Regards
    John
  • 0 in reply to John Stevens
    TI__Mastermind 25570 points
    Hello Prescott
    Can you post the attachments - schematic and PCB files (Gerber is preferable) - or send them to me at colingillmor@ti.com
    Can you also send some screenshots showing the input current over a full line cycle
    A screenshot showing the Vds waveform of one of the MOSFETs over one or two switching cycles taken when the line voltage is approximately half its peak value
    What happens if you disconnect one of the two phases (PHB pin?)
    I would recommend the suggestion to use the UCC28063A - even if just for diagnostic purposes.
    Regards
    Colin
  • 0 in reply to Colin Gillmor
    TI__Mastermind 25570 points
    Hi Prescott

    Thanks for the schematic – it seems ok at first glance. The waveforms and PCB layout will be very informative.

    Regards
    Colin