DRV8308
- 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
- Integrated Overcurrent, Overvoltage, and Overtemperature Protection
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, and overtemperature.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | DRV8308 Brushless DC Motor Controller datasheet (Rev. B) | PDF | HTML | 13 Nov 2017 |
Application note | Best Practices for Board Layout of Motor Drivers (Rev. B) | PDF | HTML | 14 Oct 2021 | |
Application note | Hardware Design Considerations for an Electric Bicycle using BLDC Motor (Rev. B) | 23 Jun 2021 | ||
Application note | System Design Considerations for High-Power Motor Driver Applications | PDF | HTML | 22 Jun 2021 | |
Application note | Understanding Smart Gate Drive (Rev. D) | 01 Mar 2021 | ||
White paper | Power Electronics in Motor Drives: Where is it? (Rev. A) | 01 Oct 2019 | ||
Application note | Hardware Design Considerations for an Efficient Vacuum Cleaner Using a BLDC Moto (Rev. B) | PDF | HTML | 06 Mar 2019 | |
EVM User's guide | DRV8308 User's Guide (Rev. F) | 12 Sep 2018 | ||
Technical article | Simplifying gate driver design for brushed DC motors | PDF | HTML | 30 Jun 2015 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
DRV8308EVM — DRV8308 evaluation module for three-phase brushless DC motor pre-drivers
The three-phase brushless motor pre-driver DRV8308 drives sensored brushless DC and brushless AC (BLAC) - often referred to as permanent magnet synchronous (PMSM). Aimed at 12V and 24V motors, this configurable pre-driver features an integrated digital speed loop with advanced commutation (...)
TIDA-00197 — Speed-Controlled 24V Brushless DC Outrunner Motor Reference Design
Package | Pins | Download |
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VQFN (RHA) | 40 | View options |
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