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TPS56339: Buck converter SW node have a -300mV

Cicely Tang
Prodigy 680 points
Part Number: TPS56339

Tool/software:

Hi expert! 

      I'm the FAE Cicely of south China, I have a question about the TPS56339EVM.

IN the Buck converter, why the SW voltage is negative 300mV when the Low-Mosfet is on .

Thanks very much!