DRV8308RHAR.B中文资料德州仪器数据手册PDF规格书

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.