4

Rev. C 3/01

APPLICATION CIRCUITS

Isolating Capacitive Loads

Programmable Torque Circuit

Clamping Output for EMF-Generating Loads

The linear relationship of torque output to current input

of the modern torque motor makes this simple control cir-

cuit ideal for many material processing and testing appli-

cations. The sense resistor develops a feedback voltage

proportional to motor current and the small signal proper-

ties of the Power Op Amp insure accuracy. With this

closed loop operation, temperature induced impedance

variations of the motor winding are automatically com-

pensated.

Replacing OPA501 with MSK 541

When replacing the OPA501, OPA511, OPA512 or 3573

with the MSK 541, it is not necessary to make any changes

in the current limit scheme. Since pin 2 is not connected

in the MSK 541, the current limit resistor connected from

pin 1 to pin 2 can be left in the circuit or removed.