OPA992 datasheet(27/50 Pages) TI

27 / 50 page

8 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.

8.1 Application Information

The OPAx992-Q1 family offers excellent DC precision and AC performance. These devices operate up to 40-V

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

10.6-MHz bandwidth and high output drive. These features make the OPAx992-Q1 a robust, high-performance

operational amplifier for high-voltage automotive applications.

8.2 Typical Applications

8.2.1 Low-Side Current Measurement

Figure 8-1 shows the OPA992-Q1 configured in a low-side current sensing application. For a full analysis of

the circuit shown in Figure 8-1 including theory, calculations, simulations, and measured data, see TI Precision

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

–

120

LOAD

5.76 k

LM7705

5 V

OUT

SHUNT

OPA992-Q1

100 m

Figure 8-1. OPAx992-Q1 in a Low-Side, Current-Sensing Application

8.2.1.1 Design Requirements

The design requirements for this design are:

• Load current: 0 A to 1 A

• Max output voltage: 4.9 V

• Maximum shunt voltage: 100 mV

8.2.1.2 Detailed Design Procedure

The transfer function of the circuit in Figure 8-1 is given in Equation 1:

VOUT = ILOAD × RSHUNT × Gain

(1)

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OPA992-Q1, OPA2992-Q1, OPA4992-Q1

SBOSAC9D – AUGUST 2022 – REVISED APRIL 2023

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OPA992 Datasheet(PDF) 27 Page - Texas Instruments