> I was thinking of doing high side current sensing like the first
> diagram here:
> http://i.cmpnet.com/planetanalog/2009/02/C0363-Figure1.gif
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> That's why I didn't understand all the talk about inaccuracies.

Zetex have some nice little chips for doing the current to voltage conversi=
on for high side sense, as do Analog Devices. Three components gives you a =
ground referenced voltage into your ADC or control loop. Check out the Zete=
x ZTX1000 series devices - if I have the family incorrect you can find them=
 easily from the function selector, same with the Analog Devices chips.

Uh oh, it looks like Zetex has been bought up by Diodes Incorporated, and t=
here is now only one device in the family, the ZTX1009 ... http://www.diode=
s.com/products/catalog/list.php?parent-id=3D126


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