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thor61 28th October 2012 12:03 AM

Heat-sink size 101
Does anyone know of a simple way or formula for selecting the proper size heat-sinks ?

sreten 28th October 2012 12:15 AM


Its not simple at all when your talking big heatsinks. The rest of the time
looking at similar applications you usually need very similar heatsinks.

rgds, sreten.

Ron E 28th October 2012 12:48 AM

Look in the application notes in the data sheet for the LM3886 chip amp. Given is a relatively simple relation between maximum junction temperature and ambient temperature, and case and heatsink degrees C (or K) per Watt ratings. This is about as simple as it can be made, although the same heatsink will have a different C/W rating at each level of dissipated power.

AJT 28th October 2012 12:48 AM

have look here: How to Select a Suitable Heat Sink and

sofaspud 28th October 2012 12:55 AM

This Jaycar primer on heatsink basics is both a useful and concise explanation.

thor61 28th October 2012 01:12 AM

Thank-you everyone ! While doing some further surfing I had found this > < this seems to be well written in a form easy to understand.

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