INA300 datasheet(22/42 Pages) TI2

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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 INA300 INA300 is designed to enable configuration for detecting overcurrent conditions in an application.

This device is individually targeted towards overcurrent detection of a single threshold. However, this device can

be paired with additional devices and circuitry to create more complex monitoring functional blocks.

8.2 Typical Applications

8.2.1 Unidirectional Operation

GPIO

Processor

DAC

GPIO

CBYPASS

2.7 V to 5.5 V

Power Supply

(0 V to 36 V)

Load

RLIMIT

RPULL-UP

10 k

IN+

IN–

CMP

LIMIT

LATCH

DELAY

TI Device

GND

ENABLE

HYS

0.1 F

–

ALERT

Figure 8-1. Unidirectional Application Schematic

8.2.1.1 Design Requirements

The INA300 device measures current through a resistive shunt with current flowing in one direction, enabling

detection of an overcurrent event only when the differential input voltage exceeds the threshold limit.

8.2.1.2 Detailed Design Procedure

Figure 8-1 shows the basic connections of the INA300 device. The input terminals, IN+ and IN–, must be

connected as closely as possible to the current-sensing resistor to minimize any resistance in series with

the shunt resistance. Additional resistance between the current-sensing resistor and input terminals can result

in errors in the measurement. When input current flows through this external input resistance, the voltage

developed across the shunt resistor can differ from the voltage reaching the input terminals.

INA300

SBOS613C – FEBRUARY 2014 – REVISED JUNE 2021

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