ADC

ENABL E

VS

OUT

GND

IN+

IN±

LOA D

Microco ntr oller

Sup ply Vo ltag e

1.7 V to 5.5 V

100 pA

(typ)

100 pA

(typ)

0.1 …F

TI-Device

TM

Bus Voltage

up to +40 V

10

INA191

SLYS020 – FEBRUARY 2019

www.ti.com

Product Folder Links: INA191

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Copyright © 2019, Texas Instruments Incorporated

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. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The INA191 amplifies the voltage developed across a current-sensing resistor as current flows through the

resistor to the load or ground.

8.1.1 Basic Connections

Figure 3 shows the basic connections of the INA191. Connect the input pins (IN+ and IN–) as closely as possible

to the shunt resistor to minimize any resistance in series with the shunt resistor. The ENABLE pin must be

controlled externally or connected to VS if not used.

Figure 3. Basic Connections for the INA191

A power-supply bypass capacitor of at least 0.1 µF is required for proper operation. Applications with noisy or

high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise.

Connect bypass capacitors close to the device pins.