On 16/08/16 01:45, Ian Swain <insane.swain@gmail.com> wrote:
Hi guys I'm building my first ldmos amp with a blf188xr and can't find a
nice think slab of copper for a heat spreader
I've only found up to 6mm think would this be okay ? Or could I get away
with 2 layers to get 12 mm with heat transfer paste ?
I've bought 12mm copper bar from Steeltech on Te Tahi street.
Heat transfer is more about the minimum number of interfaces and a
proper fit - than the best-best material. Which means, a machined
glossy-dead-flat aluminium surface is going to work better than a poor
copper surface.
You CAN get the MOSFET soldered to an aluminium heatsink - they use an
ultrasonic soldering tool and the results are superlative.
There is also the option of water-cooling an alloy block. This is a
little more fiddly in the cooling department, but quite a lot simpler in
the mounting department.
Steve
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