OPA191IDBVT datasheet(31/57 Pages) TI

31 / 57 page

7.5 k

LOAD

360 k

LM7705

5 V

OUT

SHUNT

OPA191

100 m

OPA191, OPA2191, OPA4191

www.ti.com

SBOS701C – DECEMEBER 2015 – REVISED OCTOBER 2019

Product Folder Links: OPA191 OPA2191 OPA4191

Submit Documentation Feedback

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. Customers should

validate and test 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 61 shows the OPA191 configured in a low-side current sensing application. For a full analysis of the

circuit shown in Figure 61 including theory, calculations, simulations, and measured data, see TI Precision

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

Figure 61. 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

OPA191IDBVT Datasheet(PDF) 31 Page - Texas Instruments