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UCC21222-Q1: power loss

yi hu
Prodigy 20 points
Part Number: UCC21222-Q1

1、how tu understand the formula Pgsw = 2*Vdd*Qg*fSW, why not Pgsw = Vdd*Qg*fSW

2、1 chanel E=Q*U/2 ，2chanels E=Q*U*f, why the datasheet give us is E=2*Q*U*f