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From: Glenn Ashmore
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.4) Gecko/20011128 Netscape6/6.2.1
Subject: Selecting a heatsink?
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NNTP-Posting-Date: Tue, 14 Jan 2003 15:43:32 EST
Date: Tue, 14 Jan 2003 15:45:42 -0500
How do you properly size a heatsink for a MOSFET? What spec do you look
at on the MOSFET data sheet to compare with the heatsink specs?
For example: I want to run 6.5 amps through a MOSFET with a drain to
source on resistance of .04 Ohms. I think the formula to get watts is
I^2*R so I am generating about 1.7 watts. The thermal resistance is
2.2ēC/W junction to case and .5ēC/W case to sink for a total of 2.7ēC/W
times 1.7 watts is 4.7ēC above ambient. Am I correct so far? That
sounds mighty low.
Assuming I got that right, what do you look for in heatsinks using
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