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Subject:	Re: Trace Heating
From:	"Brand, Rodney" <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Thu, 7 Oct 2004 15:01:26 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (51 lines)

Jack the heat generated is almost instantaneous, heat transfer takes
time to reach equilibrium. A 50% duty cycle will heat the trace
instantly but the system will reach a different equilibrium temperature.


-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
C. Olson
Sent: Thursday, October 07, 2004 2:35 PM
To: [log in to unmask]
Subject: [DC] Trace Heating

It seems like everyone is asking me questions I can't answer today.

We have been using the thermal trace calculator from UltraCAD
( http://www.ultracad.com/calc.htm )
but today someone asked me how time affects the temperature.
For example, what if the trace is only energized for half a second?
How hot will it get? Or how about a 50% duty cycle?

I can't seem to find any info about it. Anyone have references?

Jack (aka "one hot board designer")

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