7

Shunt

Option 3

From

Shunt Option

1, 2, or 3

4.5 V to 5.5 V

To VIN-

To VIN+

Shunt

Option 2

R3

R4

G

Comparator

2

3

4

6

5

8

1

0.6-V

Reference

RESET

CMPOUT

VIN+

VIN-

OUT

GND

CMPIN

VS

INA200 (G = 20)

INA201 (G = 50)

INA202 (G = 100)

Supply

RSHUNT

Load

To VIN+

To VIN-

R1 22 k

R4 2.2 k

Q1 2N3904

Copyright © 2017, Texas Instruments Incorporated

To VIN-

To VIN+

22

INA200, INA201, INA202

SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017

www.ti.com

Product Folder Links: INA200 INA201 INA202

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Copyright © 2006–2017, 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 INA20x series is designed to enable simple configuration for detecting overcurrent conditions and current

monitoring in an application. This device is individually targeted towards overcurrent detection of a single

threshold. However, this device can pair with additional devices and circuitry to create more complex monitoring

functional blocks.

8.2 Typical Application

(1)

In this case, Q inverts the comparator output.

Figure 34. Low-Side Switch Overcurrent Shutdown

8.2.1 Design Requirements

The device measures current through a resistive shunt with current flowing in one direction that enables

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

current reaches the set limit of the divider R1 / R2, the output of CMPOUT transitions high, which turns Q1 on,

pulls the gate of the pass-FET low, and turns off the flow off current.