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Current-Sense-Slide6

In other cases, the shunt resistor is placed on the supply, or battery side. High common mode voltages are present at the inputs of the current sensor, so integrated current sensors that can withstand high input voltages are needed. Another use for current sense amplifiers involves placing the shunt resistor in the current path at a point where the common mode voltage can vary between Ground and Battery. This is illustrated in figure three where a FET is modulated on/off. The current sense amplifier needs to have high voltage capability and a very high common mode rejection ratio.

PTM Published on: 2009-04-23