原标题：ST L6472全集成微步进马达驱动方案

　　ST公司的L6472全集成微步进马达驱动器,采用模拟混合信号技术,集成了低RDS(on) DMOS全桥和所有的功率开关以及精确的片上电流检测电路,工作电压8-45V,输出峰值电流7.0A,高达1/16的微步进,非常适合驱动带微步进的两相双极步进马达.本文介绍了L6472主要特性,框图,应用电路以及采用L6472和STM32的评估板EVAL6472H-DISC主要特性,电路图,材料清单和PCB设计图与元件布局图.

　　The L6472 device, 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 RDS(on) 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 protection. Thanks to a new current control, a 1/16 microstepping is achieved through an adaptive decay mode which outperforms traditional implementations. The digital control core can generate user defined motion profiles with acceleration, deceleration, speed or target position, easily programmed through a dedicated register set.

　　All application commands and data registers, including those used to set analog values (i.e. current control value, current protection trip point, deadtime, etc.) are sent through a standard 5-Mbit/s SPI.

　　A very rich set of protections (thermal, low bus voltage, overcurrent) makes the L6472 device“bullet proof”, as required by the most demanding motor control applications.

　　L6472主要特性:

　　 Operating voltage: 8 - 45 V

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

　　 Low RDS(on) Power MOSFETs

　　 Programmable speed profile

　　 Programmable Power MOSFET slew rate

　　 Up to 1/16 microstepping

　　 Predictive current control with adaptive decay

　　 Non dissipative current sensing

　　 SPI interface

　　 Low quiescent and standby currents

　　 Programmable non dissipative overcurrent protection on all Power MOSFETs

　　 Two levels of overtemperature protection

　　L6472应用:

　　 Bipolar stepper motor

　　图1. L6472框图

　　图2. L6472双极步进马达控制电路图

　　采用L6472和STM32的评估板EVAL6472H-DISC

　　The EVAL6472H-DISC can be used together with the STM32™ firmware library V1.0 and constitutes a complete motor control evaluation and a development platform.It is a demonstration board for motor control applications in the range of 8 V to 45 V of DC bus voltage using the STM32F105RB microcontroller with an internal 128 kB Flash size and a 64 kB internal RAM and the L6472H fully integrated solution suitable for driving two-phase bipolar stepper motors up to 1/16 microstepping.

　　The L6472H device integrates a dual 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 protection.

　　With dedicated hardware evaluation features, the EVAL6472H-DISC board is designed to help developers evaluate the device and develop their own applications.

　　评估板EVAL6472H-DISC主要特性:

　　 DC voltage range from 8 V to 45 V

　　 Maximum load phase current at 3 A r.m.s.

　　 Footprint for external resonator or crystal

　　 Control interface through trimmer - user keys and switch motor input

　　 Control through LED indicators

　　 Interface control by USB and debug outputs

　　 Compatible with SPIN family evaluation tool

　　 Autonomous board due to embedded firmware

　　 Up to 1/16 microstepping

　　 Optimized layout on 2-layer board - low cost and high thermal performance

　　评估板EVAL6472H-DISC目标应用:

　　The demonstration board is designed to fit all typical stepper motor applications - it is an

　　autonomous board due to embedded firmware.

　　图3. 评估板EVAL6472H-DISC外形图

　　评估板EVAL6472H-DISC 材料清单: