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TPS565208: Block Diagram

Part Number: TPS565208

Hi TI team , 

I need some help in understanding the right hand part of the block diagram . the HS and LS amplifiers -- what they mean and why are they used for ? The two N mosfets connected to pin 6 and 2 and also how SW is calculated if Vin is 6 v and Vfb  is 3.7 volt .

Your co-operation is anticipated .

Thanks