VDD

Rotation

Switches

Demod

and

Filtering

Gain, Compensation,

Excitation Control

Class AB

Pre-Driver

Voltage Reference

2.5V, 1.65V,

Ratiometric

Overrange

RSEL2

RSEL1

OR

ERROR

GSEL2

GSEL1

Linear

H-Bridge

Driver

Differential

Amplifier

VOUT

REFIN

REFOUT

IAIN1

DRV411

HALL1

HALL4

IAIN2

GND

Magnetic Core

ICOMP1

ICOMP2

Primary Winding

Compensation

Winding

Sensor

Excitation

DRV411

www.ti.com

SBOS693B – AUGUST 2013 – REVISED DECEMBER 2013

Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensors

Check for Samples: DRV411

1

FEATURES

DESCRIPTION

The DRV411 is designed to condition InSb Hall

23

•

Optimized for Symmetric Hall-Elements

elements

for

use

in

closed-loop

current-sensor

(for example, AKM HW-322, HW-302, or similar)

modules. The DRV411 provides precision excitation

•

Spinning Current Hall Sensor Excitation

circuitry for the Hall-element effectively eliminating

the offset and offset-drift of the Hall element. This

–

Elimination of Hall Sensor Offset and Drift

device also provides a 250-mA H-bridge for driving

–

Elimination of 1/f Noise

the sensor compensation coil as well a precision

•

Extended Current Measurement Range

differential amplifier to generate the output signal.

–

H-Bridge Drive Capability: 250 mA

The 250-mA drive capability of the H-bridge roughly

doubles the current measurement range compared to

•

Precision Difference Amplifier:

conventional single-ended drive methods.

–

Offset and Drift: 100 µV (max), 2 µV/°C

The Hall sensor front-end circuit and the differential

(max)

amplifier

employ

proprietary

offset

cancelling

–

System Bandwidth: 200 kHz

techniques. These techniques, along with a high-

•

Precision Reference:

accuracy voltage reference, significantly improve the

accuracy of the overall current-sensor module. The

–

Accuracy: 0.2% (max)

output voltage is pin-selectable to support a 2.5-V

–

Drift: 50 ppm/°C (max)

output for use with a 5-V power supply, as well as

–

Pin-Selectable for 2.5 V, 1.65 V, and

1.65-V for 3.3-V sensors.

Ratiometric Mode

For

optimum

heat

dissipation,

the

DRV411

is

•

Overrange and Error Flags

available in thermally enhanced 4-mm × 4-mm QFN

•

Supply: 2.7 V to 5.5 V

and TSSOP-20 with PowerPAD packages. The

DRV411 is specified for operation over the full

•

Packages: 4-mm × 4-mm QFN and TSSOP-20

extended industrial temperature range of –40°C to

PowerPAD™

+125°C.

•

Temperature Range: –40°C to +125°C

APPLICATIONS

•

Closed-Loop Current-Sensor Modules

•

DC and AC Current Measurement

BLOCK DIAGRAM

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.