OPA454_16 Datasheet, PDF (22/47 Pages) Texas Instruments – High-Voltage (100-V), High-Current (50-mA) Operational Amplifiers

OPA454
SBOS391B – DECEMBER 2007 – REVISED MARCH 2016
10 Application 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.
10.1 Applications Information
The OPA454 is a high-voltage, high-current operational amplifier capable of operating with supply voltages as
high as ±50 V, or as low as ±10 V. Its design and processing allows it to be used in applications where most
operational amplifiers cannot be used because of high-voltage power supply conditions, or as a result of the
need for very high-output voltage swing. The output is capable of swinging within a volt, to a few volts, of the
supply rails depending on the output current, which can be as much as ±50 mA. In addition, the OPA454
features input overvoltage protection, built-in output current limiting, thermal protection, and an output
enable/disable function.
10.1.1 Lowering Offset Voltage and Drift
The OPA454 can be used with an OPA735 zero-drift series op amp to create a high-voltage op amp circuit that
has very low input offset temperature drift. This circuit is shown in Figure 64.
Low Offset, 5mV, Drift,
0.05mV/°C, Self-Zeroing Op Amp
Gain 1st = 4.9V/V
R₁, 1st
10kW
R₂, 1st
39.1kW
High-Voltage Op Amp
Gain 2nd = 9.45V/V
R₁, 2nd
10kW
R₂, 2nd
84.5kW
V_G = ±1V
V+
1st Stage, +5V
V_OUT 1st Stage
OPA735
A₁, 1st Stage
V-
V_OUT 1st Stage ±4.9V, Max
1st Stage, -5V
V+
2nd Stage, +50V
V_OUT 2nd Stage
OPA454
A₂, 2nd Stage
R_LOAD
10kW
V-
2nd Stage, -50V
V_OUT 2nd Stage ±46V (92V_PP), Max
V_INPUT = ±1V_PP
Figure 64. Two-Stage, High-Voltage Op Amp Circuit with Very Low Input Offset Temperature Drift
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