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TPS2662: load issue

Part Number: TPS2662

Hi Sir,

if the output is loaded first, the output will not turn on,

but if turn on the TPS2662 first, and then turn on the load, the output can be work.

1. VDET_P1 has been disconnect, 

2. C9 output cap modify 1uF and remove C5.

3. dVdT modify 22nF

we want know why TPS2662 can not be started after mounting the load first?  is there any problem on schematic?