TI公司的DRV8818是用于打印機(jī),掃描儀和其它自動(dòng)化設(shè)備的步進(jìn)馬達(dá)驅(qū)動(dòng)器,集成了兩個(gè)H橋驅(qū)動(dòng)器和用來(lái)控制步進(jìn)馬達(dá)的微步距分度器邏輯.微步距馬達(dá)驅(qū)動(dòng)器采用PWM,可提供1/8步操作,每個(gè)繞組的電流高達(dá)2.5A,主要用在打印機(jī),紡織機(jī)械,定位/跟蹤,工廠自動(dòng)化和機(jī)器人.本文介紹了DRV8818主要特性, 方框圖和馬達(dá)驅(qū)動(dòng)電路以及評(píng)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(yīng)用:

? Printers

? Textile Machinery

? Positioning/Tracking

? Factory Automation

? Robotics

圖1.DRV8818方框圖

圖2.DRV8818馬達(dá)驅(qū)動(dòng)電路

評(píng)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(píng)估模塊DRV8818EVM外形圖

圖4.評(píng)估模塊DRV8818EVM方框圖

圖5.評(píng)估模塊DRV8818EVM電路圖(1)

圖6.評(píng)估模塊DRV8818EVM電路圖(2)
評(píng)估模塊DRV8818EVM材料清單: