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| DRV8881步進和有刷DC馬達驅動解決方案 |
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| 文章來源： 更新時間：2015/9/16 9:48:00 |
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TI公司的DRV8881是工業應用的步進和有刷DC馬達驅動器,輸出級包含兩個N溝功率MOSFET H橋驅動器,峰值驅動電流2.5A,工作電壓6.5V-45V,具有多種保護功能,主要用在ATM機,視頻安全照相機,工廠自動化,機器人,多功能打印機,舞臺照明設備等.本文介紹了DRV8881主要特性,框圖,步進和有刷DC馬達應用框圖,以及DRV8881P馬達驅動評估板特性,電路圖和硬件設計文件.
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應用:
Automatic Teller and Money Handling Machines
Video Security Cameras
Multi-Function Printers and Document Scanners
Factory Automation and Robotics
Stage Lighting Equipment
圖1。DRV8881E框圖
圖2。DRV8881P框圖
圖3。DRV8881P應用框圖
圖4。DRV8881P驅動步進馬達應用框圖
圖5。DRV8881P驅動有刷DC馬達應用框圖
DRV8881P馬達驅動評估板
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.
圖6.DRV8881P馬達驅動評估板外形圖
圖7.DRV8881P馬達驅動評估板電路圖(1)
圖8.DRV8881P馬達驅動評估板電路圖(2)
圖9.DRV8881P馬達驅動評估板電路圖(3) |
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