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UCC21225A: bootstrap charging path

Part Number: UCC21225A

Hi team,

For the bootstrap charging path, there is a confusing question that is looking for your support.

There is a situation that HS pin is not connected to Cboot Gnd, but the connection between HS PIN and Q1 source pin/SW node.

What will the upper drive signal be? 

Thanks

Best regards

Mia Ma