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UCC256301: RVCC for UCC28180

Martin Wen
Prodigy 615 points
Part Number: UCC256301
Other Parts Discussed in Thread: UCC28180,

Hi Bros,

My customer would like to use UCC28180+UCC256301 for PFC+LLC design.

From the UCC256301 datasheet. RVCC can for PFC. But UCC28180 VCC start up is 11.5V typical and 12.1V max. Seems it has risk.

Do you have any suggestions for UCC28180+ UCC256301 Combo? Thanks.

  • 0
    TI__Mastermind 27145 points
    Hi Martin,

    Will your customer accept placing an LDO between VCC of UCC256301 and VCC of UCC28180? During startup, the high voltage startup feature will charge the UCC256301 VCC cap which will then allow UCC28180 to start up. During operation, VCC is supplied through Aux winding on LLC transformer so you would just need to make sure there is enough overhead on the aux winding voltage for the LDO to maintain regulation.

    Best Regards,
    Ben Lough