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LT8709 Design


I need to use the LT8709 to convert a negative input (-15V) to a positive output (at least +10V) with a current output close to 1A. The design guide give the advice to use the SUD50P06 and FDMS86500L. My problem is that I need to change both (they are too large). I have no idea how to proceed to do that.

Can you provide me some advices to change them ?

Thanks for all