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TPS61096A: Vosns vs VB

Part Number: TPS61096A

Dears  currently used  TPS61096A  for variable output application through switching dedicated resister divider using  external -  mosfet ,

so couly you help check below parameter may related with my application 

1. Vosns - output voltage sense pin  + FB  , monitor from my oscilloscope ,  it seems that 10us duration and FB ping should be sample during this period .

 could you support us the detail logic of Vosns  on time combine with FB sampling .

2. below is my sch, and prepare to use mosfet configure the ouput ,  but the mosfet intenal c influnce the procedure of FB sampling which lead to some mis-voltage output,

could you give us some golden adivise, really looking forward to your reply.

nicky