+

IN+

IN-

REF

OUT

+

Bandgap

V+

EN

GND

GND

REF20xx

INA213B

+

±

+

±

ADC

REF2025, REF2030, REF2033, REF2041

SBOS600B – MAY 2014 – REVISED JULY 2014

www.ti.com

10 Applications and Implementation

10.1 Application Information

The low-drift, bidirectional, single-supply, low-side, current-sensing solution, described in this section, can

accurately detect load currents from –2.5 A to 2.5 A. The linear range of the output is from 250 mV to 2.75 V.

Positive current is represented by output voltages from 1.5 V to 2.75 V, whereas negative current is represented

by output voltages from 250 mV to 1.5 V. The difference amplifier is the INA213 current-shunt monitor, whose

supply and reference voltages are supplied by the low-drift REF2030.

10.2 Typical Application

10.2.1 Low-Side, Current-Sensing Application

Figure 49. Low-Side, Current-Sensing Application

10.2.1.1 Design Requirements

The design requirements are as follows:

1. Supply voltage: 5.0 V

2. Load current: ±2.5 A

3. Output: 250 mV to 2.75 V

4. Maximum shunt voltage: ±25 mV

18

Submit Documentation Feedback

Copyright © 2014, Texas Instruments Incorporated

Product Folder Links: REF2025 REF2030 REF2033 REF2041