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TPS53317A: TPS53317A start up waveform is not monotonous

Part Number: TPS53317A

Hi team,

My customer is using the TPS53317A now.( non-tracking mode). The start up waveform is as below which is not monotonous. Do we have some suggestions to improve it? i have suggested the customer to add more output cap 2*470uF there, but didn't help. Thanks.

SW: Yellow, Vo: blue