Hi - I'm going to be making a board that has a large number of high power (1W) LEDs. I'd ideally like to use the PCB as a heatsink to get rid of all the heat. How much surface area/watt do I need to allow? Thanks!
-Mike
How about
If things get really hot?
Regards,
Boris Mohar
Got Knock? - see: Viatrack Printed Circuit Designs (among other things)
void _-void-_ in the obvious place
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Hi Mike,
Power leds (1W and above) definitively need an aluminium subtrate (SMI type PCB, ie PCB with the base epoxy replaced by aluminium), and this SMI needs to be efficiently fitted on an appropriately calculated heatsink. Even Alumium PCB alone is not sufficient, especially if you have several LEDs... A good reference is Luxeon's "Thermal Design" application note available here :
If you can't design your own SMI board then the only reasonnable solution is to by "level 2 LEDs", meaning LEDs already mounted on a small SMI, and to fix these small SMIs on a good heatsink.
Cheers,
-- Robert Lacoste ALCIOM - The mixed signal experts
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