From: Douglas McKean ([email protected])
Date: Tue Oct 26 1999 - 19:13:10 PDT
At 09:43 AM 10/27/99 +0800, [email protected] wrote:
>
> I am routing a power supply board, but I don't
> know what trace width I should to use to feed
> a 10A current to load. Can somebody here tell
> me how calculate this?
>
> Thanks for any help
> HanYiZhou
I am reading straight off the graphs on page 38
of IPC-2221 "Generic Standard on Printed
Circuit Board Design", Feb 1998
Figure A
External: 10C rise = 425 sq mils
20C rise = 250 sq mils
Figure C
Internal: 10C rise = off the chart
20C rise = 700 sq mils
Since 1/2 oz Cu is about 0.7 mils in thickness,
divide out what you need for the width.
For this and other IPC specs, go to
http://www.ipc.org/
Regards, Doug
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