DRV8308 Controller Datasheet

DRV8308 Datasheet, PDF, Equivalent


Part Number

DRV8308

Description

Brushless DC Motor Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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DRV8308
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DRV8308
SLVSCF7B – FEBRUARY 2014 – REVISED NOVEMBER 2017
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
• 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, and
overtemperature.
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.
Simplified Schematic
8.5V to 32 V
Controller
(optional)
CLKIN
DIR
SPI
FGOUT
FAULTn
DRV8308
BLDC
Predrive
FETs
Controller
M
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.

DRV8308
DRV8308
SLVSCF7B – FEBRUARY 2014 – REVISED NOVEMBER 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configurations and Functions ....................... 3
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 Handling Ratings....................................................... 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 7
6.5 Electrical Characteristics........................................... 8
6.6 SPI Timing Requirements ....................................... 10
6.7 Typical Characteristics ............................................ 11
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 30
7.5 Programming .......................................................... 35
7.6 Register Map........................................................... 36
8 Application and Implementation ........................ 41
8.1 Application Information............................................ 41
8.2 Typical Application .................................................. 44
8.3 Do's and Don'ts ...................................................... 49
9 Power Supply Recommendations...................... 50
10 Layout................................................................... 50
10.1 Layout Guidelines ................................................. 50
10.2 Layout Example .................................................... 50
11 Device and Documentation Support ................. 51
11.1 Documentation Support ....................................... 51
11.2 Receiving Notification of Documentation Updates 51
11.3 Community Resources.......................................... 51
11.4 Trademarks ........................................................... 51
11.5 Electrostatic Discharge Caution ............................ 51
11.6 Glossary ................................................................ 51
12 Mechanical, Packaging, and Orderable
Information ........................................................... 51
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (October 2014) to Revision B
Page
• Deleted Locked Rotor Detection and Restart from the Features section............................................................................... 1
• Deleted Locked Rotor Detection from Description ................................................................................................................. 1
• Deleted Rotor Stall Detection from FAULTn description in the Pin Functions ....................................................................... 4
• Deleted extra notes in the Thermal Information table (refer to the Semiconductor and IC Package Thermal Metrics
application report for this information ..................................................................................................................................... 7
• Deleted RLOCK from tRETRY in the Electrical Characteristics ............................................................................................. 9
• Deleted tLOCK from the Electrical Characteristics................................................................................................................. 9
• Deleted Locked Rotor Detection from Overview .................................................................................................................. 12
• Updated direction change behavior in the Commutation section ......................................................................................... 17
• Deleted the Rotor Lockup (RLOCK) section in theProtectton Circuits section..................................................................... 29
• Changed the LRTIME bit to reserved in the Register Description table .............................................................................. 39
• Changed the RLOCK bit to reserved in the Register Description table ............................................................................... 40
• Added the Receiving Notification of Documentation Updates and Community Resources sections................................... 51
Changes from Original (February 2014) to Revision A
Page
• Added Handling Rating table, Feature Description section, Device Functional Modes, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section ............................................................... 6
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Product Folder Links: DRV8308
Copyright © 2014–2017, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity DRV8308 SLVSCF7B – FEBRUARY 2 014 – REVISED NOVEMBER 2017 DRV8308 B rushless DC Motor Controller 1 Feature s •1 Three-Phase Brushless DC Motor C ontroller – Digital Closed-Loop Speed Control with Programmable Gain and Fil ters • Drives 6 N-Channel MOSFETs Wit h Configurable 10- to 130-mA Gate Drive • Integrated Commutation from Hall S ensors – Timing Can Be Advanced/Delay ed – 120° or 180°-Sinusoidal Curren t Control – Single Input Controls Mot or Speed • Operating Supply Voltage 8 .5 to 32 V • Flexible Configuration M ethods – Read Internal Non-Volatile M emory – Read External EEPROM – Writ e SPI • Configurable Motor Current Li miter • 5-V Regulator for Hall Sensor s • Low-power Standby Mode • Integr ated Overcurrent, Overvoltage, and Over temperature Protection 2 Applications Industrial Pumps, Fans, and Valves White Goods • Power Tools and Lawn Equipment • Printers 3 Description The DRV8308 controls sensored b.
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