OPA2172 Datasheet, PDF (24/42 Pages) Texas Instruments – OPAx172 36-V, Single-Supply, 10-MHz, Rail-to-Rail Output Operational Amplifiers

OPA172, OPA2172, OPA4172
SBOS618H – DECEMBER 2013 – REVISED SEPTEMBER 2015
9 Applications and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The OPAx172 family of amplifiers is specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V). Many of the
specifications apply from –40°C to +125°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are presented in the Typical Characteristics.
9.2 Typical Applications
The following application examples highlight only a few of the circuits where the OPAx172 can be used.
9.2.1 Capacitive Load Drive Solution Using an Isolation Resistor
The OPA172 can be used capacitive loads such as cable shields, reference buffers, MOSFET gates, and diodes.
The circuit uses an isolation resistor (R_ISO) to stabilize the output of an op amp. R_ISO modifies the open-loop gain
of the system to ensure the circuit has sufficient phase margin.
+V_S
R_ISO
V_OUT
+
V_{IN ±}
-V_S
C_LOAD
Figure 47. Unity-Gain Buffer with R_ISO Stability Compensation
9.2.1.1 Design Requirements
The design requirements are:
• Supply voltage: 30 V (±15 V)
• Capacitive loads: 100 pF, 1000 pF, 0.01 μF, 0.1 μF, and 1 μF
• Phase margin: 45° and 60°
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