Re: Using a PCB as a heatsink
- From: Eeyore <rabbitsfriendsandrelations@xxxxxxxxxxx>
- Date: Fri, 16 Feb 2007 01:29:23 +0000
Terry Given wrote:
John Larkin wrote:
MassiveProng wrote
Eeyore <rabbitsfriendsandrelations@xxxxxxxxxxx> Gave us:
And a solder mask adds a minute amount of thermal resistance, not
enough to worry about.
I'd have thought so myself.
A blanket is a blanket is a blanket. Period.
It's like resistors in series. A couple of mils of solder mask in
series with inches of air. And the mask material is a much better heat
conductor than air. So the mask adds a small fraction of a percent to
overall theta, not enough to matter. It probably improves radiation a
bit, more than it impedes conduction.
I've never looked at solder mask in this respect, but I did the calcs
once on powder-coating. Its a surprisingly good blanket (after all, its
plastic). The conclusion was: dont powder coat heatsinks. So we anodised
it instead - "it" being a flat Al plate
disclaimer: I had no idea they were going to be powder coated until I
saw one; some marketing guy decided he wanted everything black.....
Marketing !!!!!!!!!!!
Aaaaarrrgggghhhhhhhhh !
Graham
.
- References:
- Using a PCB as a heatsink
- From: Mike Noone
- Re: Using a PCB as a heatsink
- From: Eeyore
- Re: Using a PCB as a heatsink
- From: MassiveProng
- Re: Using a PCB as a heatsink
- From: John Larkin
- Re: Using a PCB as a heatsink
- From: MassiveProng
- Re: Using a PCB as a heatsink
- From: John Larkin
- Re: Using a PCB as a heatsink
- From: Eeyore
- Re: Using a PCB as a heatsink
- From: MassiveProng
- Re: Using a PCB as a heatsink
- From: John Larkin
- Re: Using a PCB as a heatsink
- From: Terry Given
- Using a PCB as a heatsink
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