OPA191IDBVT datasheet(31/65 Pages) TI2

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9 Application and Implementation

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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The OPAx191 family offers outstanding dc precision and ac performance. These devices operate up to 36-V

supply rails and offer true rail-to-rail input/output, ultralow offset voltage and offset voltage drift, as well as

2-MHz bandwidth and high capacitive load drive. These features make the OPAx191 a robust, high-performance

operational amplifier for high-voltage industrial applications.

9.2 Typical Applications

9.2.1 Low-side Current Measurement

Figure 9-1 shows the OPA191 configured in a low-side current sensing application. For a full analysis of the

circuit shown in Figure 9-1 including theory, calculations, simulations, and measured data, see TI Precision

Design TIPD129, 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution .

7.5 k

LOAD

360 k

LM7705

5 V

OUT

SHUNT

OPA191

100 m

Figure 9-1. OPA191 in a Low-Side, Current-Sensing Application

9.2.1.1 Design Requirements

The design requirements for this design are:

• Load current: 0 A to 1 A

• Output voltage: 4.9 V

• Maximum shunt voltage: 100 mV

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OPA191, OPA2191, OPA4191

SBOS701D – DECEMBER 2015 – REVISED AUGUST 2021

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