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Subject: Re: How width of PCB track for 5AMP current ?
Date: Mon, 20 Jan 2003 16:07:05 +0700
Organization: C.S. Communications Co. Ltd.
References: <3E291D3F.1D8DED65@fanwap.com> <email@example.com>
NNTP-Posting-Date: Mon, 20 Jan 2003 09:07:13 +0000 (UTC)
X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U)
Thank you all.
It look like trace width 2mm can handle 5A with temp rise around 20C.
4mm temp rise 5C
6mm temp rise 3C
8mm - 2C
12mm - 1C
Can't calculate at 0C ?
How many dT that we can allow ?
Mike Deblis wrote:
> firstname.lastname@example.org (Tom Bruhns) wrote in message news:<email@example.com>...
> > LOOK wrote in message news:<3E291D3F.1D8DED65@fanwap.com>...
> > > I would like to make a switching regulator or linear reg.
> > >
> > > How width of PCB copper track to handle 3A current and 5A current version?
> > > Does it has some formular ?
> > If the copper is "1 ounce", then a 40 mil width (1mm) could handle 5A
> > with about a 50C temperature rise, roughly. 2mm width gets you down
> > to around 20C temperature rise. Beware if you have lots of parallel
> > traces closely spaced all handling the same current, of course! The
> > temperature rise at 3A is less than half that at 5A: 3^2*R < 0.5*
> > 5^2*R. (I'll bet a Google search on the web would turn up a chart or
> > table with this info...)
> Try: http://www.nick01.demon.co.uk/TraceWidth.html
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