Ted Tontis wrote:

> Minimum Conductor Widths For PCBs
> Temperature Rise Above Ambient
> For 1/2 oz Copper
> Amperage Ambient Temperature Conductor Width
> 1 AMP 45C (113F) .013
> 1.5 AMP 45C (113F) .025
> 2 AMP 45C (113F) .033
> 3 AMP 45C (113F) .050
> 4 AMP 45C (113F) .073
> 5 AMP 45C (113F) .110
> 6 AMP 45C (113F) .125
> 7 AMP 45C (113F) 1.45
> 10 AMP 45C (113F) 2.25

Hmmm, seems AWFULLY nonlinear!  13 mils is good for
one amp, but you need 173 times more for 10 A?  I find that
hard to believe, unless this was done at RF frequencies where
edge effects dominate.  I've been building servo amps and
such gear running 10 A on roughly 250 mil traces (1 Oz Cu),
but that is low frequency.

Jon

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