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LM5050-1: LM5050 problem

Part Number: LM5050-1
Other Parts Discussed in Thread: TPS2412

Hi,

When the customer connects two power supplies in parallel and found that the 54V is not powered, can be obtained by measuring the residual voltage (about 2V). You can refer to the waveform below.

After removing the O-ring IC, the 2V cannot be measured, but only removing the MOS will still have residual electricity.

Is this caused by the internal circuit of the IC?

Because the end customer found this problem, please help to explain, thank you!