Information

Texas Instruments Signal Chain Guide 2013 | 75
Monitoring and Control
Pulse-Width Modulation
Get more information: www.ti.com/product/DRV411
Sensor Signal Conditioning IC for Closed-Loop Magnetic-Current Sensor
DRV411
DRV411 functional block diagram
The DRV411 is designed for conditioning InSb Hall Elements for use in closed loop
current sensor modules. It provides precision excitation circuitry for the hall-element
effectively eliminating the offset and offset-drift of the hall element. It also provides a
250 mA H-Bridge for driving the sensor’s compensation coil as well a precision differen
-
tial amplifier to generate the output signal. The 250 mA drivecapability of the H-Bridge
enables r
oughly doubling the current measurement range compared with conventional
single-ended drive methods.
The Hall-Element Amplifier and also the differential amplifier employ proprietary offset
cancelling techniques. This, along with a high accuracy voltage reference, significantly
improves the accuracy of the overall current sensor module. The output voltage is pin-
selectable to support 2.5 V output for use with 5 V power supply as well as 1.65 V for
3.3 V sensors.
Key Features
•Optimizedforsymmetichallelements
AKM HW-302, HW-322, or similar
•Spinningcurrentexcitation
Elimination of hall offset, drift, and
low frequency noise
•Extendedcurrentmeasurementrange
H-Bridge output drive: 250 mA
•Precisiondifferentialamplifier
Offset/Drift:100µVmax,1µV/°C
max
200 kHz system bandwidth
•Precisionreference
Accuracy: 0.2% max, DRIFT:
50 ppm/°C max
Pin-selectable for 2.5 V, 1.65 V
•Over-rangeanderrorflag
Applications
•Closedloopcurrentsensormodules
•DC-andAC-currentmeasurement
Excitation
GSEL1 GSEL2 5V
RM
Class
AB
Driver
AB+
AB-
Over-Range RSEL1 RSEL2
Over-
Range
REFOUT
REF
2.5V/1.65V
0.25V/Ratio
Gain, Compensation
Excitation Control
Diff
Amp
Rotation Switches
Demod/ Filtering
IA
IN2
IA
IN1
I
COMP2
I
COMP1
V
OUT
REF
IN
-
+
AB+
AB-
PWM Power Drivers
Device Description
Supply Voltage
(V)
Output
Current
(A) (typ)
Saturation
Voltage
(V)
R
ON
(Ω)
Frequency
(kHz)
HiRel
Avail. Package Price*
Single Switch
DRV101 Low-Side with Internal Monitoring 9 to 60 2.3 1 0.8 24 N TO-220, DDPAK 3.85
DRV102 High-Side with Internal Monitoring 8 to 60 2.7 2.2 0.95 24 N TO-220, DDPAK 3.85
DRV103 Low-Side with Internal Monitoring 8 to 32 1.5/3 0.6 0.9 0.5 to 100 N SOIC-8, SOIC-8 PowerPAD™ 2.00
DRV104 High-Side with Internal Monitoring 8 to 32 1.2 0.65 0.45 0.5 to 100 N HTSSOP-14 PowerPAD 1.75
Bridge
DRV590 1.2 A, High-Efficiency PWM Power Driver 2.7 to 5.5 1.2 0.48 0.4 250/500 N SOIC-PowerPAD, 4 mm x 4 mm
MicroStar Junior™
12.00
DRV591 ±3 A, High-Efficiency PWM Power Driver 2.8 to 5.5 3 0.195 0.065 100/500 N 9x9 PowerPAD QFP 11.00
DRV592 ±3 A, High-Efficiency H-Bridge 2.8 to 5.5 3 0.195 0.065 1000 N 9x9 PowerPAD QFP 2.85
DRV593 ±3 A, High-Efficiency PWM Power Driver 2.8 to 5.5 3 0.195 0.065 100/500 N 9x9 PowerPAD QFP 10.80
DRV594 ±3 A, High-Efficiency PWM Power Driver 2.8 to 5.5 3 0.195 0.065 100/500 N 9x9 PowerPAD QFP 10.80
Sensor Signal Conditioning
DRV401 Signal Cond. for Magnetic-Current Sensor 4.5 to 5.5 0.2 0.4 — 2000 Y QFN-20, SOIC-20 2.05
DRV411 Signal Conditioning and 250 mA Full-Bridge
Drive-IC for Closed-Loop Hall-Sensors
2.7 to 5.5 0.25 0.4 — 2000 N QFN-20, TSSOP-20 2.05
*Suggested resale price in U.S. dollars in quantities of 1,000. See www.ti.com/hirel for HiRel options. Preview products are listed in bold blue.