OPA197_16 Datasheet, PDF (29/39 Pages) Texas Instruments – 36-V, Precision, Rail-to-Rail Input/Output, Low Offset Voltage Operational Amplifiers

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OPA197, OPA2197, OPA4197
SBOS737A – JANUARY 2016 – REVISED JULY 2016
8.2.2 Slew Rate Limit for Input Protection
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 OPAx197 make the device an optimal amplifier to achieve slew rate control
for both dual- and single-supply systems.Figure 55 shows the OPA197 in a slew-rate limit design.
Op Amp Gain Stage
VEE
-
VIN
OPA197
+ V+
VCC
Slew Rate Limiter
R2
1.6 0Ÿ
C1
470 nF
R1
1.69 NŸ
VEE
-
OPA197
+ V+
VCC
VOUT
RL
10 NŸ
Figure 55. Slew Rate Limiter Uses One Op Amp
For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation results, and test
results, refer to TI Precision Design TIDU026, Slew Rate Limiter Uses One Op Amp.
Copyright © 2016, Texas Instruments Incorporated
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