Electronics > Beginners
Suitable and cheap heatsink
VEGETA:
Dear friends,
I have a project to make electronic load which is 30v 2A only, but I plan to make it 30v 5A with a max of 150W in the future.
Will this heatsink be enough: https://www.aliexpress.com/item/1-PCS-100x41x8mm-Aluminum-Radiator-Heat-Sink-Heatsink-for-Computer-LED-Amplifier-IC-Transistor-Computer/32914236957.html
I only want cheap stuff from aliexpress especially for shipping, if I am fortunate enough to be able to sell it in future.
I am open to use a cheap 12v fan or so if it helps.
GeoffreyF:
Any piece of heat conductive metal such as aluminum or copper is fine. If it is made with fins, that's better. If it has no fins, make it a little bigger.
CJay:
No idea, the specs on there relate to a fan, not a heatsink and your specs are pretty vague too, you need to know specs for the devices you're going to mount, decide on an acceptable max temperature over ambient for the heatsink and a few other things.
You could find a similar size heatsink from a supplier that gives proper specs and assume they're approximately the same, then do the heatsink calculations (which are pretty simple)
Gut feeling is that yes, it'd probably do but it'd be useful to you in the future to be able to specify and design it properly.
hayatepilot:
The linked heatsink is way too small for 60W let alone 150W!!
It is only 8mm high.
Just look at how big a CPU heatsink is, which dissipates about the same power.
This heatsink is the size you would need: https://www.dhgate.com/store/product/50-150w-high-power-led-heat-sink-led-cooling/176904642.html
And it needs a fan too for full dissipation capacity.
Greetings
IanMacdonald:
Bear in mind it's the sum of the thermal resistances of the device itself, its case, any mounting washer and the h/sink that have to be added to determine the power rating. Just fitting a larger h/sink to an underrated device soon gets into a law of diminishing returns.
For this kind of duty, avoid TO220 devices as you just can't get an adequate thermal bonding to the h/s on so small a case. TO247 or TO3 will be a better bet, though even so one would be stretching things, think in terms of at least two in parallel.
Going fan assisted will definitely lead to a smaller and probably cheaper unit than a monster convection h/s. Thermostatic control them becomes preferable to avoid too much noise on light loads. Although that does call for a separate fan supply, of course, which convection cooling avoids.
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