Hello Technetters,
We are doing a PCB design (four layers) for a client.  We have a 5 volts
regulator dissipating 2W in a TO-220 package.  The board will be working
in an aluminium enclosure and we do not have much room to put a heat
sink big enough.  The regulator must be mounted on the PCB.  The PCB is
mounted under a machine's top plate (3/8 inch aluminium thick) with the
components on the PCB top side.  An aluminium enclosure covers the board
once it is installed.  We though bolting the TO-220 to the PCB with a
copper plane on both sides of the board, under the regulator, to bring
the heat to a mounting post at about 1/2 inch from the voltage
regulator.  The heat then runs up the mounting post to the machine's top
plate.

The copper plane still offers some resistance to the heat transfer.
Does anyone has a suggestion how we can transfer the heat to the
mounting post or to the machine's top plate?

Thanks

Yvon Hache, P. Eng.
Concept + Inc.
P.O. Box 1287
Moncton, NB
E1C 8P9

Tel: 506-858-4153 ext 104
Fax: 506-858-4075
E-mail: [log in to unmask]
Web: www.concept-plus.com

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