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'[PICLIST] [EE] TO-220 heatsinking: THANKS!'
2002\02\14@103345 by Trevor Page

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Hi all,

I'd just like to say many thanks to those who have offered advice on the
heatsinking issue. Some very interesting points have been made, and no doubt
I shall now redesign the board to make room for some heatsinks. The point
about the extra mechanical support they offer is a good one too (it gets a
right pain when the TO220 packages start to bend around and fall off after
you've handled the board a few times...)

So for future heatsink calculations, I suppose the best approach is to
actually make some temp measurements inside the enclosure under extreme
conditions e.g. under a spotlight or something, and use that as your Ta?
Hey, this thermometer I've had on my 15yr old Casio watch may come in useful
after all...

Trev


Trev


> {Original Message removed}

2002\02\14@104436 by Kathy Quinlan

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----- Original Message -----
From: "Trevor Page" <spam_OUTtrevor.pageTakeThisOuTspamPACE.CO.UK>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Subject: Re: [EE] TO-220 heatsinking: THANKS!

Only just catching up with email before going to bed.

In all my designs where a heatsink is not needed (in theory) I place a
copper pour as big as possible on the top and the bottom of the board, and
leave enough room for a TV4 heatsink they only cost ~au$0.50 in qty's of
1000 and do for all the jobs I have needed where a heatsink is more a
precaution than a requisite.


Regards,

Kat.

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2002\02\15@031211 by Mike Blakey

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I have a natty little excel spreadsheet for heatsink calcs, If you wish, I will
email you a copy off list.



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