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LM25118-Q1: High Side Turn ON

Part Number: LM25118-Q1

 

Hello,

I'm using the LM251118.and  I need to Know how to calculate VGS for the High side in order to ensure that the  FET will  turns on after the controller.

I have tried to calculate deltaVboot= Qtot/Cboot , but I can't find all parameters in datasheet 

Could anyone help me in this issue ?

Best Regard,