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Extend Range of Current-Sense Amplifiers

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Abstract: Using a transistor as shown, you can double the allowed voltage limit on a current-sense amplifier by stacking two such amplifiers one upon the other. The voltage signal from the bottom amplifier then represents current as the voltage across the sense resistor, times the product of the gains of the two amplifiers.
Maxim > App Notes > Amplifier and Comparator Circuits
Keywords: high-side current-sense amplifiers, npn transistors, maximum operating voltage Nov 29, 2010

APPLICATION NOTE 4517
Extend Range of Current-Sense Amplifiers


Abstract:Using a transistor as shown, you can double the allowed voltage limit on a current-sense amplifier by stacking two such
amplifiers one upon the other. The voltage signal from the bottom amplifier then represents current as the voltage across the
sense resistor, times the product of the gains of the two amplifiers.

A similar version of this article appeared in the May 1, 2008 issue of Power Electronics Technology magazine.

High-side current-sense amplifiers are relatively inexpensive devices that sense……
Extend Range of Current-Sense Amplifiers
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