SBOS701D December 2015 – August 2021 OPA191 , OPA2191 , OPA4191
PRODUCTION DATA
In control systems for valves or motors, abrupt changes in voltages or currents can cause mechanical damages. By controlling the slew rate of the command voltages into the drive circuits, the load voltages ramps up and down at a safe rate. For symmetrical slew-rate applications (positive slew rate equals negative slew rate), one additional op amp provides slew-rate control for a given analog gain stage. The unique input protection and high output current and slew rate of the OPAx191 make the device an optimal amplifier to achieve slew rate control for both dual-supply and single-supply systems. Figure 9-5 shows the OPA191 in a slew-rate limit design. For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation results, and test results, refer to TI Precision Design TIPD140, Single Op-Amp Slew Rate Limiter..