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TPS54331: Abnormal output

Part Number: TPS54331

Tool/software:

Hi team my customer is using TPS54331 and the vin is 12V and vout is 5V.

when the Vo is connected to MCU, the output will be 8V and the Vsense will also be 1.3V. The SCH is as attached and the Vonis 5V when connected to other loads.could u kindly help to analysis the problem?thanks