Peter Clifton wrote:
For 0.01 Ohm sensing, you probably want to attempt at making a kelvin
connection, see http://www.edn.com/article/CA502424.html
Interesting. I'm really not yet convinced on the best trace width - if
it turns out to be larger than the pad size of that 0.1 Ohm resistor,
than it is irrelevant.
There's a bunch of calculators online to help figure out appropriate
trace width. I suppose that they assume DC. My app is audio, so the
likelihood of an average current is much lower. I really care about the
peaks, and more importantly, a short circuit. So even then, by the time
the circuit figures out there is a short, the drive circuit is already
shut down (maybe the order of tens of microseconds, or so). I don't
expect things to heat up much - which implies that the kelvin technique
would work. I'm just not sure though, which route to go.
gene
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