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PMP11062: Running 15v bias circuit from 160v B+ instead of 380v B+

John Malnar
Prodigy 40 points
Part Number: PMP11062
Other Parts Discussed in Thread: UCC28722

Hello,

Reference design PMP11062.

I would like to run the 15v bias circuit from 160v B+ versus the 380 volt B+ in the existing circuit.

What values do I need to change in the existing 15v bias circuit to run from 160v?

Thanks

  • 0
    TI__Expert 3640 points

    Hi,

    Actually, the bias supply design of PMP11062 can take 160V input without changing anything. Because we need bias supply voltage to be built up before PFC is actually working. Therefore, the bias supply can take a rectified and filtered voltage with universal AC input.

    Regards,

    Sheng-Yang Yu

  • 0 in reply to Sheng-yang Yu1
    Prodigy 40 points

    Thanks for your reply Sheng-Yang,

    I am unable to get the 15 volt supply to come up consistently. I get the 3 pulses when UVLO reaches 21v, but controller will not start.

    How can I check faults to see which one is causing my fault..

    Is it OK to use a ceramic cap for VDD cap?

    I used values from the reference circuit, but am wondering if there were any errors on schematic or part values.

    Any help would be greatly appreciated.

    Thanks

  • 0 in reply to John Malnar
    TI__Expert 3640 points

    Hi John,

    You have tripped one of the protections listed in the "Fault protection" section in UCC28722 datasheet.

    If the circuit value you are using does matches with what I'm using in PMP11062, then the possibility of the fault triggering I can think of are:

    1. IC placed inside the power loop. Solution: minimize buck converter power loop and move IC outside the power loop.

    2. PSR IC like UCC28722 is sensitive to magnetic flux. So you might want to use a "shielded" inductor instead.

    I hope this helps to solve your issue.

    Regards,

    Sheng-Yang Yu