TI公司的DRV8818是用于打印机,扫描仪和其它自动化设备的步进马达驱动器,集成了两个H桥驱动器和用来控制步进马达的微步距分度器逻辑.微步距马达驱动器采用PWM,可提供1/8步操作,每个绕组的电流高达2.5A,主要用在打印机,纺织机械,定位/跟踪,工厂自动化和机器人.本文介绍了DRV8818主要特性, 方框图和马达驱动电路以及评估模块DRV8818EVM方框图,电路图和材料清单.
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 R_ds(on)
Thermally Enhanced Surface Mount Package

DRV8818应用:
• Printers
• Textile Machinery
• Positioning/Tracking
• Factory Automation
• Robotics

图1.DRV8818方框图

图2.DRV8818马达驱动电路

评估模块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.

图3.评估模块DRV8818EVM外形图

图4.评估模块DRV8818EVM方框图

图5.评估模块DRV8818EVM电路图(1)

图6.评估模块DRV8818EVM电路图(2)
评估模块DRV8818EVM材料清单: