DRV401
SBVS070A − JUNE 2006 − REVISED OCTOBER 2006
Sensor Signal Conditioning IC for
Closed-Loop Magnetic Current Sensor
FD EATURES
DESCRIPTION
DESIGNED FOR SENSORS FROM
VACUUMSCHMELZE (VAC)
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.
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SINGLE SUPPLY: 5V
POWER OUTPUT: H-Bridge
DESIGNED FOR DRIVING INDUCTIVE LOADS
EXCELLENT DC PRECISION
WIDE SYSTEM BANDWIDTH
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.
HIGH-RESOLUTION, LOW-TEMPERATURE
DRIFT
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BUILT-IN DEGAUSS SYSTEM
EXTENSIVE FAULT DETECTION
EXTERNAL HIGH-POWER DRIVER OPTION
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.
AD PPLICATIONS
GENERATOR/ALTERNATOR MONITORING
AND CONTROL
To maintain the highest accuracy, the DRV401 can
demagnetize (degauss) the sensor at power-up and on
demand.
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FREQUENCY AND VOLTAGE INVERTERS
MOTOR DRIVE CONTROLLERS
SYSTEM POWER CONSUMPTION
PHOTOVOLTAIC SYSTEMS
Patents Pending.
Compensation
RS
ICOMP1
ICOMP2
PWM PWM
Compensation Winding
Primary Winding
DRV401
Diff
Amp
Magnetic Core
Field Probe
IS2
IS1
IP
VOUT
REFIN
Probe
Interface
Integrator
Filter
H−Bridge
Driver
Timing, Error Detection,
and Power Control
VREF
Degauss
VREF
+5V GND
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