DRV401 Datasheet, PDF (1/28 Pages) Burr-Brown (TI) – Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensor

DRV401
SBVS070A − JUNE 2006 − REVISED OCTOBER 2006
Sensor Signal Conditioning IC for
Closed-Loop Magnetic Current Sensor
FEATURES
D DESIGNED FOR SENSORS FROM
VACUUMSCHMELZE (VAC)
D SINGLE SUPPLY: 5V
D POWER OUTPUT: H-Bridge
D DESIGNED FOR DRIVING INDUCTIVE LOADS
D EXCELLENT DC PRECISION
D WIDE SYSTEM BANDWIDTH
D HIGH-RESOLUTION, LOW-TEMPERATURE
DRIFT
D BUILT-IN DEGAUSS SYSTEM
D EXTENSIVE FAULT DETECTION
D EXTERNAL HIGH-POWER DRIVER OPTION
APPLICATIONS
D GENERATOR/ALTERNATOR MONITORING
AND CONTROL
D FREQUENCY AND VOLTAGE INVERTERS
D MOTOR DRIVE CONTROLLERS
D SYSTEM POWER CONSUMPTION
D PHOTOVOLTAIC SYSTEMS
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.
Patents Pending.
Compensation Winding
Primary Winding
Magnetic Core
Field Probe
I_P
Compensation
R_S
PWM PWM
I_COMP1
I_COMP2
DRV401
Diff
Amp
IS2
IS1
Probe
Interface
Integrator
Filter
H−Bridge
Driver
V_OUT
REF_IN
Timing, Error Detection,
and Power Control
Degauss
V_REF
V_REF
+5V GND
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