TinyG Heatsink Question

Started by cmcgrath5035 on Sep 5, 2013 in TinyG Support. 1 reply, last activity Sep 7, 2013.

cmcgrath5035Staff Sep 5, 2013 #

I'm not sue if this question belongs in Support or Projects
I have seen a few comments about thermal management, and after looking over the TinyG PWB and reviewing the SPECS for the TI driver, I thought about drilling 4 holes thru the PWB so that the underside of the board could be fastened to a heavy Alu bottom plate heat sink with appropriate standoffs.
It appears this is a 2 layer PWB and that copper in this area is at Gnd (Motor GND), is that correct?

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aldenStaff Sep 7, 2013 #

Yes, that is correct. If you do this be sure you do not bridge out of the ground "lanes" under the chip. This probably means milling your heatsink.

Another way to do this without drilling the holes is to use a Berquist (or similar) double-sided sticky, electrically insulating, thermally conductive pad. Something like this:
http://www.digikey.com/product-detail/en/BP100-0.008-00-1010/BER159-ND/307781

I've had good luck with this. You can just cover the entire back of the board and pop a surplus Duron or other heatsink on that's the approximate size you need.

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