INA300 datasheet(10/42 Pages) TI2

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7 Detailed Description

7.1 Overview

The INA300 INA300 is a 36-V, common-mode comparator designed for overcurrent protection applications. To

reduce the system component count, this device combines the current-sense amplifier and threshold comparison

into a single product for the overcurrent detection function. Programming this comparison threshold is configured

through a single external resistor, which simplifies the current design while allowing for easy adjustments

to the threshold when needed. The threshold setting resistor value is selected based on an internal 20-µA

current source to achieve a corresponding signal to the voltage that develops across the current-sensing or

current-shunt resistor in series with the monitored load current.

The device is designed to accommodate a range of application requirements, including common-mode voltage,

noise thresholds, and signal ranges. A wide signal threshold range reaching up to 250 mV is available to

accommodate both power-sensitive applications requiring small dissipations across a current sense resistor and

larger current-sensing resistors used in lower current applications.

Additional features available with the INA300 INA300 device include a disable mode for reducing the current

consumption of the device to below 10 µA, an output mode selector to enable a latched or transparent alert

output, and a selectable hysteresis value and alert response delay.

The wide signal range of the device is further enhanced with an adjustable hysteresis value to adjust the

characteristics of the comparator, which allows for better accommodation of the full input range. The selectable

alert response delays present in the INA300 INA300 device assist in optimizing device operation to account for

the system noise levels and operating characteristics required from this device. Longer delay settings allow for

added rejection of system noise, thus reducing the potential for false alerts resulting from noise spikes that can

occur in high-speed comparators.

7.2 Functional Block Diagram

Level

Detection

HYS

DELAY

GND

IN+

IN±

ENABLE

LATCH

Control

Logic

ALERT

LIMIT

Power Supply

(0 V to 36 V)

Load

VPULL-UP

INA300-Q1

7.3 Feature Description

7.3.1 Selecting a Current-Sensing Resistor

The device measures the differential voltage developed across a resistor when current flows through it to

determine if the monitored current exceeds a defined limit. This resistor is referred to as a current-sensing

INA300

SBOS613C – FEBRUARY 2014 – REVISED JUNE 2021

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