FEATURES

VACUUMSCHMELZE (VAC)

DRIFT

APPLICATIONS

AND CONTROL

DESCRIPTION

The DRV401 is designed to control and process signals

from

specific

magnetic

current

sensors

made

by

Vacuumschmelze GmbH & Co. KG (VAC). A variety of

current ranges and mechanical configurations are

available. Combined with a VAC sensor, the DRV401

monitors both ac and dc currents to high accuracy.

Provided functions include: probe excitation, signal

conditioning of the probe signal, signal loop amplifier, an

H-bridge driver for the compensation coil, and an analog

signal output stage that provides an output voltage

proportional to the primary current. It offers overload and

fault detection, as well as transient noise suppression.

The DRV401 can directly drive the compensation coil, or

connect to external power drivers. Therefore, the DRV401

combines with sensors to measure small to very large

currents.

To maintain the highest accuracy, the DRV401 can

demagnetize (degauss) the sensor at power-up and on

demand.

Integrator

Filter

Probe

Interface

H−Bridge

Driver

V

OUT

REF

IN

I

COMP2

R

S

I

COMP1

Compensation

Patents Pending.

Diff

Amp

Timing, Error Detection,

and Power Control

Degauss

V

REF

V

REF

GND

+5V

IS2

IS1

DRV401

I

P

Compensation Winding

Magnetic Core

Primary Winding

Field Probe

PWM

PWM

DRV401

SBVS070B − JUNE 2006 − REVISED MAY 2009

Sensor Signal Conditioning IC for

Closed-Loop Magnetic Current Sensor

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Copyright

 2006−2009, Texas Instruments Incorporated

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.

PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.