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Old 14th April 2014, 03:20 PM   #13901
dieringe is offline dieringe  Germany
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The heating devices should be in the upper region of the heatsink anyway ...
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Old 14th April 2014, 03:42 PM   #13902
mfrimu is offline mfrimu
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My PCB is mounted on 10mm or 3/8 inch 4-40 metal standoffs directly near the top of the heatsinks. The FET's are on the bottom side of the PCB pointing downwards.

That way my P1 P2 and P3 are easily accessible and PCBs are further away from PSU components.



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clarify
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Old 14th April 2014, 04:27 PM   #13903
mfrimu is offline mfrimu
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Why? I'd imagine the opposite since heat tends to rise.

My concern was if (I doubt) the PCB would get hotter when the FETS are below....



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The heating devices should be in the upper region of the heatsink anyway ...
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Old 14th April 2014, 04:38 PM   #13904
BobEllis is offline BobEllis  United States
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mfrimu, you have it arranged for the best efficiency of the heat sinks. The little bit of heating that the board gets from being above the output devices is insignificant.
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Old 14th April 2014, 04:46 PM   #13905
dieringe is offline dieringe  Germany
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heat tends to rise.
Only with the air, so the hotter area should be at the top
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Old 14th April 2014, 06:14 PM   #13906
mfrimu is offline mfrimu
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As of curiosity, why devices at top would be better for heat distribution?

( PS: My devices are a bit lower than half way, not at the bottom... )

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Only with the air, so the hotter area should be at the top

Last edited by mfrimu; 14th April 2014 at 06:21 PM.
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Old 14th April 2014, 06:48 PM   #13907
dieringe is offline dieringe  Germany
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I think I've read that somewhere in Papa's papers, long ago.
As this was counterintuitive to me as well I assumed it was tested and tried to explain it to myself by the better airflow you get if the center of heat is higher and the hottest air leaves the heatsink as soon as possible.
Right?
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Old 14th April 2014, 06:55 PM   #13908
Zen Mod is offline Zen Mod  Serbia
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F5 power amplifier
if devices are situated in one row on heatsink , they need to be horizontally on lower third

warum?

darum!

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Old 14th April 2014, 06:58 PM   #13909
dieringe is offline dieringe  Germany
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darum!
That's no explanation. Did you try it?
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Old 14th April 2014, 07:06 PM   #13910
Zen Mod is offline Zen Mod  Serbia
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that's plain logic and physics , which I don't need to prove to anyone

plenty of examples all over the board

just think of temperature interaction of vertically aligned heatsink and airflow and you'll get it
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