[SI-LIST] Re: DC power Analysis/Current Density
- From: "Istvan Nagy" <buenos@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 12 Apr 2012 17:35:12 +0100
Hi Bala,
This was I think discussed a few months ago.
See links to older posts:
//www.freelists.org/post/si-list/permissable-current-density-in-PCB-copper,1
//www.freelists.org/post/si-list/permissable-current-density-in-PCB-copper,2
//www.freelists.org/post/si-list/permissable-current-density-in-PCB-copper,3
//www.freelists.org/post/si-list/permissable-current-density-in-PCB-copper,4
//www.freelists.org/post/si-list/permissable-current-density-in-PCB-copper,5
//www.freelists.org/post/si-list/permissable-current-density-in-PCB-copper,6
As the power plane acts as a heatsink and heatspreader as well, the maximum
current density depends on how well the plane cools itself at the given
location on the plane. The temperature you get also depens on it. This
allowed max temperature might be limited materials properties. So it
requires an electrical and thermal simulator, like Comsol. Or just
experiment. If you have uniform current density distribution, then you could
find easy answer to your question, otherwise its complex and needs a field
solver.
regards,
Istvan Nagy
-----Original Message-----
From: bala
Sent: Thursday, April 12, 2012 1:28 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] DC power Analysis/Current Density
Hi Experts,
I have a question on ‘DC power analysis’. Hope the maximum allowed IR
drop/V-drop value can be concluded from the line/load regulation. Is there
any general formula to find out a maximum allowed ‘current density’ for a
particular power plane? For example, if I want to simulate 3.3V, 0.8A
plane@maximum of 70 degree Celsius, how shall we find out the maximum
allowed
current density for this case?
Regards
bala
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