LOAD

V

SUPPLY

R

SHUNT

40kW

40kW

40kW

40kW

INA152

+5V

V

OUT

+2.5V

V

REF

V

IN+

V

IN-

V+

V+

+5V

OUT

OUT

INA193-INA198

V

IN+

V

IN-

+5V

INA193-INA198

22

INA193, INA194, INA195

INA196, INA197, INA198

SBOS307G – MAY 2004 – REVISED JANUARY 2015

www.ti.com

Product Folder Links: INA193 INA194 INA195 INA196 INA197 INA198

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Copyright © 2004–2015, Texas Instruments Incorporated

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 INA193-INA198 devices measure the voltage developed across a current-sensing resistor when current

passes through it. The ability to have shunt common-mode voltages from

−16-V to +80-V drive and control the

output signal with Vs offers multiple configurations, as discussed throughout this section.

9.2 Typical Application

The device is a unidirectional, current-sense amplifier capable of measuring currents through a resistive shunt

with shunt common-mode voltages from

−16 V to 80 V. Two devices can be configured for bidirectional

monitoring and is common in applications that include charging and discharging operations where the current

flow-through resistor can change directions.

Figure 29. Bi-Directional Current Monitoring

9.2.1 Design Requirements

Vsupply is set to 12 V, Vref at 2.5 V and a 10-mΩ shunt. The accuracy of the current will typically be less than

0.5% for current greater than ±2 A. For current lower than ±2 A, the accuracy will vary; use the Device Functional

Modes section for accuracy considerations.