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UCC28722: Darlington pair for higher power non-isolated buck converter

Part Number: UCC28722
Other Parts Discussed in Thread: PMP7668,

Hello,

We want to use UCC28722 to create a non-isolated auxiliary supply of 6W for our PFC after reading your document SLUA721A. Given our Ipeak for the BJT is slightly high. We wanted to use a Darlington pair BJT (2 independent single BJT) to get the required hfe (80). We would like your opinion on layout/schematic design modification while referring PMP7668 as the base.

It would be great if you could also recommend other ways if need be, to achieve the same goal.