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TPS54339: the voltage of the output and VFB pin is lower than expected

Part Number: TPS54339

hello,

here is my Schematic:

input voltage is 12V, expected 3.3V output. but now I get about 1.5V from the output, 0.35V from the VFB pin's. and another board I get about 1.6V from the output, 0.375V from the VFB pin's.

many thanks for any suggestion.

Best regards,

Yingcai Zhou