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LM5050-1-Q1: Gate Source voltage

Part Number: LM5050-1-Q1
Other Parts Discussed in Thread: LM5050-1


In my circuit there is a buck converter and then oring circuit that is connected to output of buck converter.

I have Choroma DC electronic load, resistive and capacitive(20mF)

While the buck converter is not operating but input voltage(24v) is present, I measured gate source voltage of Q1 and Q2.

The electronic load is not yet turned on, but the capacitor (20 mf) is still connected to the output.

Until the output capacitor voltage reaches approximately 400 mV, gate source behaves like pictures below,

CH4(green): gate-source, CH2: Vout

After output voltage reaches 400mV, gate-source voltage is constanly 14V.

Has anyone experienced this situation before?

What could be the problem with this circuit?