DRV411_15 Datasheet, PDF (1/34 Pages) Texas Instruments – Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensors

DRV411
www.ti.com
SBOS693B – AUGUST 2013 – REVISED DECEMBER 2013
Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensors
Check for Samples: DRV411
FEATURES
1
•23 Optimized for Symmetric Hall-Elements
(for example, AKM HW-322, HW-302, or similar)
• Spinning Current Hall Sensor Excitation
– Elimination of Hall Sensor Offset and Drift
– Elimination of 1/f Noise
• Extended Current Measurement Range
– H-Bridge Drive Capability: 250 mA
• Precision Difference Amplifier:
– Offset and Drift: 100 µV (max), 2 µV/°C
(max)
– System Bandwidth: 200 kHz
• Precision Reference:
– Accuracy: 0.2% (max)
– Drift: 50 ppm/°C (max)
– Pin-Selectable for 2.5 V, 1.65 V, and
Ratiometric Mode
• Overrange and Error Flags
• Supply: 2.7 V to 5.5 V
• Packages: 4-mm × 4-mm QFN and TSSOP-20
PowerPAD™
• Temperature Range: –40°C to +125°C
DESCRIPTION
The DRV411 is designed to condition InSb Hall
elements for use in closed-loop current-sensor
modules. The DRV411 provides precision excitation
circuitry for the Hall-element effectively eliminating
the offset and offset-drift of the Hall element. This
device also provides a 250-mA H-bridge for driving
the sensor compensation coil as well a precision
differential amplifier to generate the output signal.
The 250-mA drive capability of the H-bridge roughly
doubles the current measurement range compared to
conventional single-ended drive methods.
The Hall sensor front-end circuit and the differential
amplifier employ proprietary offset cancelling
techniques. These techniques, along with a high-
accuracy voltage reference, significantly improve the
accuracy of the overall current-sensor module. The
output voltage is pin-selectable to support a 2.5-V
output for use with a 5-V power supply, as well as
1.65-V for 3.3-V sensors.
For optimum heat dissipation, the DRV411 is
available in thermally enhanced 4-mm × 4-mm QFN
and TSSOP-20 with PowerPAD packages. The
DRV411 is specified for operation over the full
extended industrial temperature range of –40°C to
+125°C.
APPLICATIONS
• Closed-Loop Current-Sensor Modules
• DC and AC Current Measurement
BLOCK DIAGRAM
Primary Winding
Magnetic Core
DRV411
Sensor
Excitation
HALL1
HALL4
Rotation
Switches
Demod
and
Filtering
Class AB
Pre-Driver
IPRIM
Compensation
Winding
Gain, Compensation,
Excitation Control
GSEL1 GSEL2
ERROR
VDD ICOMP1
RSHUNT
IAIN2
IAIN1
Differential
Amplifier
Linear
H-Bridge
Driver
VOUT
REFIN
Overrange
Voltage Reference
2.5V, 1.65V,
Ratiometric
REFOUT
GND ICOMP2
OR
RSEL1 RSEL2
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.
PowerPAD is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated