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 OPAx990-Q1 make the device an optimal amplifier to achieve slew rate control for both dual- and single-supply systems. Figure 7-3 shows the OPA990-Q1 in a slew-rate limit design.

Figure 7-3 Slew Rate Limiter Uses One Op Amp