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TPS51100: Please help check the TPS51100 power down test result

Part Number: TPS51100

Dears,

could you please help check the test result of TPS51100 when power down?

you can see below test result about the VCC=5V and VTT=0.75V waveform when power down the TPS51100, you can see there is a peak(rising) firstly then decline to zero. is it make sense and work stable? why?

DATASHEET:

Bes Regards

Iven Xu