Circuit senses high-side current


Posted on May 8, 2012

The accurate, high-side, current-sense circuit in Figure 1 does not use a dedicated, isolated supply voltage, as some schemes do. Only the selected transistors limit the common-mode range. The circuit measures the voltage across a small current-sense resistor, RS. The operation of the circuit revolves around the high-side current mirror comprising Q1 and Q2. All the circuit components have one overall function: to make the collector currents equal in Q1 and Q2.






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