<100

<100

IN+

IN-

VS

GND

100 nF

VS = 1.7V± 5.5V

Load

Load

Supply

CFILTER

0.1µF to 1µF

RFILTER

RDIFF

RSHUNT

Figure 8-1. Input Filtering

Overload conditions are another consideration for the device inputs. The device inputs are specified to tolerate

26 V across the inputs. A large differential scenario can be a short to ground on the load side of the shunt.

This type of event can result in full power-supply voltage across the shunt (as long the power supply or energy

storage capacitors can support this voltage). Removing a short to ground can result in inductive kickbacks

that can exceed the 26-V differential and 48-V common-mode rating of the device. Inductive kickback voltages

are best controlled by Zener-type, transient-absorbing devices (commonly called transzorbs) combined with

sufficient energy storage capacitance. The Current Shunt Monitor with Transient Robustness Reference Design

describes a high-side, current-shunt monitor used to measure the voltage developed across a current-sensing

resistor and how to better protect the current-sense device from transient overvoltage conditions.

In applications that do not have large energy storage electrolytics on one or both sides of the shunt, an input

overstress condition can result from an excessive dV/dt of the voltage applied to the input. A hard physical short

is the most likely cause of this event, and the excessive dV/dt can activate the ESD protection in systems with

large currents. Testing demonstrates that the addition of 10-Ω resistors in series with each input of the device

sufficiently protects against dV/dt failures up to the 48-V rating of the device. Selecting these resistors in the

range noted has minimal effect on accuracy.

8.2 Typical Application

A0

Alert

SDA

SCL

CBYPASS

0.1 µF

Load

VS

Bus Voltage

(upto 48 V)

IN+

IN-

Supply Voltage (VS):

1.7 V to 5.5 V

GND

TI Device

RSHUNT

Figure 8-2. Typical High-Side Sensing Circuit Configuration, INA232

8.2.1 Design Requirements

The INA232 measures the voltage developed across a current-sensing resistor (RSHUNT) when current passes

through it. The device also measures the bus supply voltage and calculates power when calibrated. It also

comes with alert capability, where the alert pin can be programmed to respond to a user-defined event or a

conversion ready notification.

www.ti.com

INA232

SBOSAA2 – DECEMBER 2022

Copyright © 2022 Texas Instruments Incorporated

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