Dual Channel Voltage-to-Current (V-I) converter circuit with BJT

This low-side voltage-to-current (V-I) converter delivers a well-regulated current to a load. The circuit accepts an input voltage from 0V to 3V and converts it to a current from 0A to 6A (combined). The current is accurately regulated by feeding back the voltage drop across a low-side current-sense resistor (R8, R9 + R16, R17) to the OPAMP. Resistor divider (R4 and R5 + R12 and R13) is implemented to limit the maximum voltage at the non-inverting input, Vin, and sense resistor, (R8, R9 + R16, R17), at full-scale. Using a Darlington BJT reduces the output current requirement for the OPAMP. Feedback components R6+R13, R7+R15, and C5+C6 provide compensation to ensure stability. R6+R13 isolates the input capacitance of the bipolar junction transistor (BJT) R7+R15 provides a DC feedback path directly at the current setting resistor (R8, R9 + R16, R17), and C5+C6 provides a high-frequency feedback path that bypass the BJT.