Hi,
See this link:
http://www.linear.com/currentsense/00-intoduction.pdf
(At the bottom of this one page PDF you will see more links).
* * *
Precision Circuit Monitors Negative Supply Current
This current-sensing circuit monitors a negative power supply
and provides a positive output voltage proportional to the load current.
http://www.maxim-ic.com/appnotes.cfm...te_number/3855
Best regards,
Luciano




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