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LM5046: LM5046 has an abnormal on the Vdc waveform

Part Number: LM5046

Dears,

My customer used LM5046 at a DC-600W, and it can be started up to 12V without load, but there has an abnormal on the gate waveforms, and please refer to the following.

Could you help to check if there have any suggestions? thanks.

schematic

Q34A Vds