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LM5008A: voltage drop on switching node

Part Number: LM5008A


all,

  A question about LM5008A switching waveform, there is a voltage drop on switching node on LM5008A EVM if Vin is 54V. If Vin is 36V, the waveform looks good, no voltage drop. Why is there a drop here?

CH1 (yellow): LM5008A switching node

CH2 (Blue): Vout

CH3 (pink): inductor current

CH4 (Green): input voltage