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| DRV8881步进和有刷DC马达驱动解决方案 |
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| 文章来源： 更新时间：2015/9/16 9:48:00 |
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TI公司的DRV8881是工业应用的步进和有刷DC马达驱动器,输出级包含两个N沟功率MOSFET H桥驱动器,峰值驱动电流2.5A,工作电压6.5V-45V,具有多种保护功能,主要用在ATM机,视频安全照相机,工厂自动化,机器人,多功能打印机,舞台照明设备等.本文介绍了DRV8881主要特性,框图,步进和有刷DC马达应用框图,以及DRV8881P马达驱动评估板特性,电路图和硬件设计文件.
The DRV8881 is a bipolar stepper or brushed-DC motor driver for industrial applications. The device output stage consists of two N-channel power MOSFET H-bridge drivers. The DRV8881 is capable of driving up to 2.5-A peak current or 1.4-Arms current per H-bridge (with proper PCB ground plane for thermal dissipation and at 24 V and TA = 25℃).
AutoTune™ automatically tunes motors for optimal current regulation performance and compensates for motor variation and aging effects. AutoTune is available on the DRV8881E. Additionally, slow, fast, and mixed decay modes are available.
The PH/EN (DRV8881E) or PWM (DRV8881P) pins provide a simple control interface. An internal sense amplifier allows for adjustable current control. A low-power sleep mode is provided for very-low quiescent current standby using a dedicated nSLEEP pin.
Internal protection functions are provided for undervoltage, charge pump faults, overcurrent, short-circuits, and overtemperature. Fault conditions are indicated by anFAULT pin.
DRV8881主要特性：
Dual H-Bridge Motor Driver
Bipolar Stepper Motor Driver
Single or Dual Brushed-DC Motor Driver
6.5- to 45-V Operating Supply Voltage Range
Two Control Interface Options
PHASE/ENABLE (DRV8881E)
PWM (DRV8881P)
Multiple Decay Modes to Support Any Motor
AutoTune™ (DRV8881E Only)
Mixed Decay
Slow Decay
Fast Decay
Adaptive Blanking Time for Smooth Motion
Parallel Mode Operation (DRV8881P Only)
Configurable Off-Time PWM Chopping
10, 20, or 30 µs Off-Time
3.3-V, 10-mA LDO Regulator
Low-Current Sleep Mode (28 µA)
Small Package and Footprint
28 HTSSOP (PowerPAD)
28 WQFN (PowerPAD)
Protection Features
VM Undervoltage Lockout (UVLO)
Charge Pump Undervoltage (CPUV)
Overcurrent Protection (OCP)
Automatic OCP Retry
Thermal Shutdown (TSD)
Fault Condition Indication Pin (nFAULT)
DRV8881应用:
Automatic Teller and Money Handling Machines
Video Security Cameras
Multi-Function Printers and Document Scanners
Factory Automation and Robotics
Stage Lighting Equipment
图1。DRV8881E框图
图2。DRV8881P框图
图3。DRV8881P应用框图
图4。DRV8881P驱动步进马达应用框图
图5。DRV8881P驱动有刷DC马达应用框图
DRV8881P马达驱动评估板
DRV8881P Dual H-Bridge Stepper or Dual Brushed DC Motor Driver Evaluation Module
The DRV8881P customer EVM is a platform revolving around the DRV8881P, amedium-voltage, dual Hbridgedriver, and highly-configurable power stage. This device has been optimized to control one or twobrushed DC motors, or a stepper motor. The DRV8881P can also be configured to drive a single-brushedDC motor using both output stages in parallel mode to increase the drive current.
The EVM houses a MSP430 microcontroller and an USB interface chip. The USB chip allows for serialcommunications from a PC computer where a Microsoft® Windows® application is used to schedule serialcommands. These commands can be used to control each of the device’s signals, and drive the motor ormotors at the desired rate.
The microcontroller firmware outputs the control signals and PWM signals to move the motor. Thefirmware also monitors the nFAULT signal to alert the GUI that a FAULT has occurred.
This document details the operation of the EVM, as well as the hardware configurability of the evaluationmodule.
图6.DRV8881P马达驱动评估板外形图
图7.DRV8881P马达驱动评估板电路图(1)
图8.DRV8881P马达驱动评估板电路图(2)
图9.DRV8881P马达驱动评估板电路图(3)
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