Performance of Current-Sense Amplifiers with Input Series Resistors
This application note explains some performance characteristics of high-side current sense amplifiers. The article explains how to use these amplifiers with series resistors on the sense inputs. This design approach is especially useful for applications that need to amplify small voltages across a sense resistor on a high-voltage rail, and feed it to a low-voltage ADC or a low-voltage analog control loop. Test data from the MAX4173 and the MAX4372 are presented.
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