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Forum Post: RE: LM3478 WEBENCH Problem(FET selection)

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Hi Toshio,

I believe you were simulating a Boost design, the VDS for this is Vout+Vd. Please see page 18 of the datasheet.

Page 21 is for designing the SEPIC topology  and for that VDS is indeed Vin +Vout +Vd

Best regards,

Tommy


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