Electronics > Projects, Designs, and Technical Stuff

DC load using a CPU cooler

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timb:
@Kevin.D These MOSFETs are specifically designed for linear operation in the SOA, so the graphs in the datasheet are pretty accurate for the conditions we’ll be using them in.

timb:
@microbug

So here’s one idea I had:







The idea here is your FETs would mount to this copper block (50x75x5 [WxHxT] in this example). The hatched area would be where the A30’s heat pipes press against. It would be wise to use thermal epoxy or thermal compound here. The area on the board the copper slab will mount should be a solid copper pour and have holes drilled so the FETs and slab can be bolted down. Obviously you’d still need to use the heatsink mount itself to keep that stabilized on the board.

Copper has such a low thermal resistance, it would be very close to mounting them straight on the heatsink itself. The advantage here is ease of mounting.

I can also design one to work with only two FETs (one on each side).

mrflibble:
I'll just accidentally drop these links here, and let the coolness factor do the rest. ;)

http://www.mouser.com/new/panasonic/panasonicthermalgraphite/
http://www.digikey.com/product-highlights/us/en/panasonic-pgs/3953

timb:
Yeah I saw those the other day... I was toying with the idea of placing one on top of the copper block. The FETs and heatsink would rest on it.

Cool stuff. Pun intended.

Sent from my Smartphone

microbug:

--- Quote ---@Kevin.D These MOSFETs are specifically designed for linear operation in the SOA, so the graphs in the datasheet are pretty accurate for the conditions we’ll be using them in.
--- End quote ---
Phew!

Tim, your idea looks great! I wonder if thermal graphite is conductive, because if not, it could insulate the drains of the FETs. I probably will use two of the previously mentioned MOSFETs, they look like they should cope with the heat dissipation; the heatsink needs space for two TO-247 packages. Spikee's experience is encouraging.

Thanks!

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