4 Channel Current Sense Amplifier – Low and High-Side Voltage Output

This 4-Channel current sense amplifier is designed for cost-optimized applications. This is a current-sense amplifier (also called a current-shunt monitor) that senses the voltage drop across current-sense resistors at common-mode voltages from  –0.2 V to +26 V, independent of the supply voltage. The project was built using  INA4180 chip which integrates a matched resistor gain network in four, fixed-gain  20V/V, this matched gain resistor network minimizes gain error and reduces the temperature drift. The board operates with a single  2.7-V to 5.5-V power supply. The four-channel  INA4180 draws a maximum supply current of  900 µA. Resistors R2, R6, R8, R12, R3, R7, R9, R13 and Capacitor C3, C4, C5, C6 used as input filters. The gain of the amplifier is  20V/V, and external input resistors resulting a  0.9% gain error.