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UCC27511: Power consumption of UCC27511 driving 2 pcs CSD18532Q5B

Part Number: UCC27511
Other Parts Discussed in Thread: CSD18532Q5B

Hi team,

Customer is using our reference design PMP9656 to in their project. This design use 2 pcs UCC27511 drive 4 pcs MOSFET at the secondary side. And the MOSFET use CSD18532Q5B, it's gate charge at 6V is 25nC; switching frequency is 200kHz, so the total current of two pcs UCC27511 would be:

25nC*200kHz*4 = 20mA; 

But now, customer measure the average current pass through the Q8, the waveform shows as below, and it's average value is 29.32, could you help comments if this is a reasonable value? Thanks.

Best Regards,

Will