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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: 
drv8818[1].pdf
(743.1 KB)
slvu681[1].pdf
(775.47 KB)
來源：網絡 |
