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TPS63900: It can't work Vin=2.0V / Vout=3.0V

Part Number: TPS63900

Hi,

It's my Schematic, it can't work Vin=2V/ Vout=3.0V.

I guess the issues that is Venable timing so that I change C1=2.2uF, R1=40kohm. the td(POR_=40.8ms refer the measured wave form/ yellow=Vin/ red= Ven/  Blue=Vout))

It's still not work. Do you have any suggestions??

BRs,

Gordon Liu