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DRV8308_15

更新时间: 2024-11-10 01:13:59
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德州仪器 - TI /
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60页 1702K
描述
DRV8308 Brushless DC Motor Controller

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DRV8308  
SLVSCF7A FEBRUARY 2014REVISED OCTOBER 2014  
DRV8308 Brushless DC Motor Controller  
1 Features  
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.  
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  
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.  
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  
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.  
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  
An assortment of protection features bolster system  
robustness, as the DRV8308 handles and reports  
2 Applications  
overcurrent,  
overvoltage,  
undervoltage,  
Industrial Pumps, Fans, and Valves  
White Goods  
overtemperature, and locked rotors.  
Power Tools and Lawn Equipment  
Printers  
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  
Predrive  
DRV8308  
CLKIN  
DIR  
BLDC  
Controller  
M
FETs  
SPI  
Controller  
(optional)  
ISEN  
FGOUT  
Speed Control  
Protection  
EPROM  
FAULTn  
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.  
 
 
 
 

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