TI公司的DRV8818是用于打印機,掃描儀和其它自動化設備的步進馬達驅動器,集成了兩個H橋驅動器和用來控制步進馬達的微步距分度器邏輯.微步距馬達驅動器采用PWM,可提供1/8步操作,每個繞組的電流高達2.5A,主要用在打印機,紡織機械,定位/跟蹤,工廠自動化和機器人.本文介紹了DRV8818主要特性, 方框圖和馬達驅動電路以及評估模塊DRV8818EVM方框圖,電路圖和材料清單.
The DRV8818 provides an integrated stepper motor driver solution for printers, scanners, and other automated equipment applications. The device has two H-bridge drivers, as well as microstepping indexer logic to control a stepper motor.
The output driver block for each consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings.
A simple step/direction interface allows easy interfacing to controller circuits. Pins allow configuration of the motor in full-step, half-step, quarter-step, or eighth-step modes. Decay mode and PWM off time are programmable.
Internal shutdown functions are provided for over current protection, short circuit protection, under-voltage lockout and overtemperature.
DRV8818主要特性:
Pulse Width Modulation (PWM) Microstepping Motor Driver
Built-In Microstepping Indexer
Up to 2.5-A Current Per Winding
Microstepping Indexer Provides up to 1/8-Step Operation
Low 0.37-Ω (HS + LS) MOSFET On-Resistance (at 25°)
Programmable Mixed Decay, Blanking, and Off Time
Pin-Compatible Upgrade to DRV8811 With Lower Rds(on)
Thermally Enhanced Surface Mount Package
DRV8818應用:
• Printers
• Textile Machinery
• Positioning/Tracking
• Factory Automation
• Robotics
圖1.DRV8818方框圖
圖2.DRV8818馬達驅動電路
評估模塊DRV8818EVM
The DRV8818EVM is a complete solution for evaluating the DRV8818 micro-stepping, bipolar stepper driver. It includes a USB link to provide easy control from a personal computer (PC), a MSP430 microcontroller that interprets serial commands from the PC and generates control signals to the driver device, and the DRV8818 device with access to all signals for a complete evaluation.
圖3.評估模塊DRV8818EVM外形圖
圖4.評估模塊DRV8818EVM方框圖
圖5.評估模塊DRV8818EVM電路圖(1)
圖6.評估模塊DRV8818EVM電路圖(2)
評估模塊DRV8818EVM材料清單:
詳情請見:
http://www.ti.com/lit/ds/symlink/drv8818.pdf
和
http://www.ti.com/lit/ug/slvu681/slvu681.pdf
