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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