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Date: | Mon, 15 Sep 2008 21:37:38 -0400 |
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Terry,
Once again I post a self promoting email, but hey.I can't help it. J
You're welcome to download our calculator for current capacity but I'm not
sure it will tell you exactly what
you need.
www.saturnpcb.com
In short, I do not worry much about delta T vs delta V issues unless I'm
very tight for routing room. If I calculate a trace to handle
six amps with continuous power then I know it will handle six amps for 5 or
30 seconds.
However, if anyone can come up with a formula that takes delta T into
account and would be willing to share it, I'd be happy to add the function
into our tool.
Hope this helps.
Ken
_____________________________________
Kenneth J. Wood
President
Saturn PCB Design, Inc. * <mailto:[log in to unmask]>
[log in to unmask]
2737 Bishop Lane ( (407) 340-2668
Deltona, Fl 32725 fax: (386) 789-2765
www.saturnpcb.com
PCB_Design_new
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Terry Kozlyk
Sent: Monday, September 15, 2008 5:31 PM
To: [log in to unmask]
Subject: [TN] Trace Current Carrying Capacity - Dynamic
The UltraCAD PCBTEMP utility is OK for steady state current. I believe
its based on IPC-2221A chart on page 41 (May 2003 version).
But what if a 30 amp trace takes a surge of approx. 100 amp for some
known time such as 5 or 30 secs. How can you find a good
approximation of what trace width/gauge to use?
I now have such a requirement to meet & never had to deal with
surges of such long duration.
Adding dynamics to a current spike by being able to vary the spike
height and the duration also would be helpful.
Any thoughts on where I can find a chart/calculator which can give me
some approximation?
Thanks
TDK
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