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PMP40025: Reg Heatsink for Switching Mosfet in PMP40025 reference design

Part Number: PMP40025

Dear All,

one of my customer working on PMP40025 design, 

Regarding heat sink for switching MOSFET: In the image given in TI Web, no heat sink is provided for MOSFET (image attached), In their rough calculations they got around 71 mW losses (including switching) .

please help to advise about heat sink for MOSFET. customer planned to use 



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