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UCC28704: FET is burned

Part Number: UCC28704

Hi, 

We are producing the custom board(28704) as follows. 

R116, R138, FET(Q14), R89, R137 are burned in a few boards.

we are using the 15V_aux power for the ucc 256303 and using the 15V_ISO power for the UCC24612-2

can you help me?

Regards,

Nick