Current Amplifier Driving An Inductive Load
by Dennis L. Feucht
Innovatia Laboratories
Motor windings, deflection yokes, solenoids, and inductance heaters present inductive loads to amplifiers that drive them. A feedback current amplifier that can drive these loads with a flat frequency response requires careful attention to the sense resistor.
Amplifier Model
Consider the following amplifier, with sense resistor, single-pole amplifier, and LR load, as shown below, simulated in Protel CircuitMaker.
The design goal for this amplifier is a transconductance of 5 A/V, with a flat frequency response and maximized bandwidth.
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