原标题：ST L6470微步进马达驱动解决方案

　　ST 公司的L6470是全集成微步进马达驱动器,采用混合信号技术,包括有运动引擎和SPI接口,非常适合驱动具有微步进的两相双极步进马达. L6470工作电压4-45V,峰值电流7.0A(3.0 A r.m.s.),低RDSon功率MOSFET,多达1/128微步进,可编程的速度和定位.本文介绍了L6470主要特性,方框图, 双极步进马达控制应用电路图,所用材料清单以及菊花链接配置图.

　　L6470: Fully integrated microstepping motor driver with motion engine and SPI

　　The L6470, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two phase bipolar stepper motors with microstepping.

　　It integrates a dual low RDSon DMOS full bridge with all of the power switches equipped with an accurate on chip current sensing circuitry suitable for non dissipative current control and overcurrent protections. Thanks to a unique control system a true 1/128 steps resolution is achieved. The digital control core can generate user defined motion profiles with acceleration, deceleration, speed or target position easily programmed through a dedicated registers set. All commands and data registers, including those used to set analogue values (i.e. current control value, current protection trip point, dead time, PWM frequency etc.) are sent through a standard 5Mbit/s SPI.

　　A very rich set of protections (thermal, low bus voltage, overcurrent, motor stall) allows designing a fully protected application, as required by most demanding motor control applications.

　　L6470主要特性:

　　■ Operating voltage: 8 - 45 V

　　■ 7.0 A output peak current (3.0 A r.m.s.)

　　■ Low RDSon power MOSFETS

　　■ Programmable speed profile and positioning

　　■ Programmable power MOS slew-rate

　　■ Up to 1/128 microstepping

　　■ Sensorless stall detection

　　■ SPI interface

　　■ Low quiescent and standby currents

　　■ Programmable non dissipative overcurrent protection on high and low-side

　　■ Two levels overtemperature protection

　　L6470应用:

　　■ Bipolar stepper motor

　　图1.L6470方框图

　　图2.采用L6470的双极步进马达控制应用电路图

　　所用材料清单:

　　图3.菊花链接配置图