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TPS55010: the reason of voltage drop on the PH side of L.

Part Number: TPS55010

My customer is evaluating TPS55010, but he observed voltage drop on the PH side of L on one of three boards, because switching is stopped.  You can see the following waveform.  Could you please let us know the reason?


He said to improve this when he optimizes capacitor value on COMP pin.  So is "one of the reason" not optimized capacitor value on COMP pin?  Please let us know.

Thanks and best regards,