# High Power Mosfet

I am developing a DC to DC converter(40V -> 12V) circuit using Mosfet. As I am using solar two panels rated 375 Watts (Max 10Amp,37.5V) each, so the convertor needs to handle 750 Watts at peak. However, most of the Mosfet which saw being available cant handle power dissipation up to 750 Watts.

Is there a Mosfet which can handle up to this load, as I don't want to put MOSFET's in parallel.

• Should all the power of the solar panels go into the mosfet as heat? Commented Aug 28, 2020 at 11:42
• Actually, looking at the datasheet of irf540link, it mentions max power dissipation as 150W, so I thought that 150W is the maximum power output. However, as per the answers provided, now I understand, that power dissipation mentioned in the datasheet is actually the maximum amount of energy that can be wasted as heat, and it not related to the maximum power which can be provided by the MOSFET. Commented Aug 28, 2020 at 13:15
• This shows a basic misunderstanding of DC-DC converter design, such that ... while an answer may help, I think a book is required. Look at "Switch-Mode Power Supplies" by C. Basso (or search here for "Verbal Kint".)
– user16324
Commented Aug 28, 2020 at 13:15
• You don't need MOSFETs that can handle 750 W .... That's the power the panels produce, not the power the MOSFETs need to sink. The power the MOSFETs will see is the current through them (squared) times their channel resistance (RDSon). P=I^2*R Hopefully the vast majority of the power they produce goes to your load ;) Commented Aug 28, 2020 at 15:10
• ^^^^ Plus some switching losses. But nowhere near 750W @BrianDrummond is right, you're best to study the topic and understand switchers before trying to design one. Commented Aug 28, 2020 at 15:22