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UCC28063: About UCC28063 not normal work question

Cao Cao
Intellectual 770 points
Part Number: UCC28063

Hi team,

I plan UCC28063 design PFC power but UCC28063 work is not normal then burned....

1. Looks our schematic VINAC and CS pin is sense before Bridge is right?

2. UCC28063 work is not normal because L1/L2 inductor current wave  no interleave phase 180 degree.

Do you have any idea can help me to fix issue? thanks.

  • 0
    TI__Mastermind 34465 points

    Hello Cao Cao,

    There are numerous reasons that will prevent the UCC28063 from operating.
    But usually it is because one of the  pins on the device not getting the proper input signal or it is being overloaded in some manner.

    The section of the schematic you show does not have an input to the CS pin. I can see that system ground is tied directly to the negative of the bridge rectifier.
    This is not correct. Please review the typical applications diagram in page  one of the data sheet for how to connect up the current sense resistor.

    Regards

    John Griffin