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Input current of UC3854

MD Home
Intellectual 840 points

We use UCC3854 for PFC boost (220VAC to 390Vdc). we notic that the input current changing(out of spec at 20% load condition),after that I replce new IC( at same board) the result is the input current reduce and pass criteria. What parameter effect to this input current?

MD

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    TI__Mastermind 25130 points

    MD,

    From the information provided i can not tell.

    Can you send me a copy of the schematic including all component values? i need to see where the sresses are.

    Also please send the date code information on the failing part so that I can look up the batch history to see if there are any probelms with the lot.

    Regards,

    John