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app note: A simple current-sense technique eliminating a sense resistor

Posted on Sunday, July 13th, 2014 in app notes by DP

ap_microsemi_an-7

An old but interesting app note(PDF) from Microsemi on resistorless current-sensing technique.

This application note introduces a simple current-sense technique that eliminates that sense resistor, resulting in system-cost reduction, PCB space saving, and power efficiency improvement. Furthermore, the new current sensing mechanism allows higher dynamic tripping current than the static one (built-in low-pass filtering) to improve current-sense noise immunity.

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