DRV8308_15 Datasheet, PDF (1/60 Pages) Texas Instruments – DRV8308 Brushless DC Motor Controller

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DRV8308
SLVSCF7A – FEBRUARY 2014 – REVISED OCTOBER 2014
DRV8308 Brushless DC Motor Controller
1 Features
•1 Three-Phase Brushless DC Motor Controller
– Digital Closed-Loop Speed Control with
Programmable Gain and Filters
• Drives 6 N-Channel MOSFETs with Configurable
10- to 130-mA Gate Drive
• Integrated Commutation from Hall Sensors
– Timing Can Be Advanced/Delayed
– 120° or 180°-sinusoidal current control
– Single Input Controls Motor Speed
• Operating Supply Voltage 8.5 to 32 V
• Flexible Configuration Methods
– Read Internal Non-Volatile Memory
– Read External EEPROM
– Write SPI
• Configurable Motor Current Limiter
• 5-V Regulator for Hall Sensors
• Low-power Standby Mode
• Locked Rotor Detection and Restart
• Integrated Overcurrent, Overvoltage, and
Overtemperature Protection
2 Applications
• Industrial Pumps, Fans, and Valves
• White Goods
• Power Tools and Lawn Equipment
• Printers
3 Description
The DRV8308 controls sensored brushless DC
motors with advanced features and a simple input
interface. As a predriver, it drives the gates of 6
external N-Channel MOSFETs with a configurable
current of 10mA to 130mA for optimal switching
characteristics.
The 3 motor phases are commutated according to the
Hall sensor inputs. Once the motor reaches a
consistent speed, the DRV8308 uses just 1 Hall
sensor to minimize jitter caused by sensor mismatch.
The Hall signal-to-drive timing can be advanced or
delayed in 0.1% increments to optimize power
efficiency. An optional 180° commutation mode drives
sinusoidal current through the motor and minimizes
audible noise and torque ripple. Peak motor current
can be controlled by sizing a sense resistor.
The DRV8308 achieves closed-loop speed control to
spin motors to a precise RPM across a wide range of
load torques. The system matches motor
speed—generated from an FG trace or the Hall
sensors—to the reference frequency on pin CLKIN.
The DRV8308 can also drive motors open-loop using
a duty cycle command, from either a clock or register
setting.
An assortment of protection features bolster system
robustness, as the DRV8308 handles and reports
overcurrent,
overvoltage,
undervoltage,
overtemperature, and locked rotors.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DRV8308
VQFN (40)
6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
8.5V to 32 V
Controller
(optional)
CLKIN
DIR
SPI
FGOUT
FAULTn
DRV8308
BLDC
Predrive
FETs
M
Controller
Speed Control
Protection
EPROM
ISEN
Hall sensors
FG trace
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.