Extending Input Voltage Range of Precision Current-Sense Amplifiers to 180V or Higher is Easy
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The accuracy of some current-sense amplifiers (CSAs) is excellent, but often these CSAs are designed with battery-powered applications in mind. They can't handle the high supply voltages needed for use in offline and high-voltage backplane applications. You can extend the input common-mode voltage range of high accuracy CSAs to hundreds of volts by adding a general-purpose dual op amp and a few discrete components.