[SI-LIST] Re: Improve the heat on a PCB
- From: RCSXC@xxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 18 Jun 2001 21:24:12 EDT
What exactly is your application? If you have transistor drivers on the board
then you must try to heat sink them properly. The technique depends upon the
driver. Don't attempt to bring the heat into the interior layers unless it
goes onto a large plane like ground, that can be exposed on the outer layers
to air. You can also use heavier copper on the PCB. An application for a
board that I'm working on must be able to handle 150 amps of current through
it, for safety the copper is 6 oz. Best idea is to get the heat out quickly
if possible. Also make sure that you are not stressing components that
generate the heat by running them too close to their maximum power limits.
Many ICs (including regulators) will thermally turn off if their junction
temps exceed about 150 C.
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