TRINAMIC 公司的TMC389是三相步進馬達驅動器,集成了低諧振的三相斬波器用于靜態馬達工作,能直接驅動三個外接N/P溝雙MOSFET,馬達電流高達8A和60V,多達171個微步距,采用基于自動負載調整馬達電流的coolStep™s20,節能高達75%,主要用在精密三相步進馬達驅動,醫療和光學應用,機器人和舞臺照明.本文介紹了TMC389主要特性和優勢,方框圖和應用電路圖,和高壓大電流功率級電路圖以及評估板TMC389–EVAL主要特性,應用框圖,電路圖和PCB元件布局圖.
The TMC389 is an energy efficient three phase stepper motor driver for high resolution microstepping applications. It integrates a low resonance three phase chopper for quiet motor operation. Its step and direction interface allows simple use. An SPI™ management interface allows for parameterization and diagnostics. The TMC389 directly drives 3 external N/P channel dual MOSFETs for motor currents up to 8A and up to 60V. Protection and diagnostic features further reduce system cost and increase reliability.

TMC389產品亮點:
 Up to 171 microsteps (256 sine wave steps) using step/direction interface or 20 Bit SPI™interface
 High precision sensorless motor load measurement stallGuard2
 Energy efficiency and coolness by automatic load dependant motor current regulation coolStep™s20 : Save up to 75% of energy!
 Internal microstep extrapolation allows 256 wave step smoothness with low frequency step input
 Dual edge step option allows half step frequency requirement, e.g. for opto-couplers
 Up to 8A Motor current using external N&P channel MOSFET pairs
 Synchronous rectification reduces transistor heating
 9V to 60V operating voltage (peak)
 3.3V or 5V interface
 QFN32 package for extremely small solution with superior thermal performance
 EMV optimized current controlled gate drivers – up to 45mA gate current
 Overcurrent, short to GND and overtemperature protection and diagnostics integrated

TMC389應用:
 Precision three phase stepper motor drives
 Stage lighting
 Medical applications
 Optical applications
 Robotics
Motor type
 3 phase Stepper

圖1.TMC389基本應用框圖

圖2.TMC389方框圖和應用電路圖

圖2.TMC389采用外接柵極驅動器的高壓大電流功率級電路圖

圖2.TMC429 StepDir控制器和SPI互連的示例圖

TMC389評估板
The TMC389 evaluation board features a TMC389 with external power MOSFETs plus a microcontroller, which allows interfacing to a PC for visualization and control of all parameters. The motor can be operated via the step and direction interface, using either an external source, or using the integrated microcontroller as a step pulse generator.
The TMC389-EVAL allows you to explore all functions of the TMC389. The evaluation board comes with a PC software which gives you access to every function of the driver. It comes along with a Step&Direction interface, a RS232 and a USB port. The TMC389-Eval is a complete "plug and play" solution, additionally only a motor, a PC and a power supply are required!

TMC389評估板亮點:
 Evaluate all features of the TMC389
 Use stallGuard2™ with your motor
 Use coolStep™ with your motor
 Control all parameters from a PC
 Motor current can be set to up 6A depending on sense resistor selection.
 Supply voltage up to 40V (MOSFETs can be exchanged against 60V 2A types)
 Access all pins of the TMC389

Motor type
 3 phase Stepper
TMC389-EVAL contains
TMC389-Evaluation Board
USB cable for connection to PC
software for Windows (downloadable)
documentation, board and circuit description and all datasheets (downloadable)


圖3.TMC389-EVAL評估板外形圖

圖4.TMC389-EVAL評估板應用框圖

圖5.TMC389-EVAL評估板元件布局圖


圖6.TMC389-EVAL評估板電路圖(1)

圖7.TMC389-EVAL評估板電路圖(2)

圖8.TMC389-EVAL評估板電路圖(3)

圖9.TMC389-EVAL評估板電路圖(4)