TI公司的三相BLDC馬達驅動(dòng)套件DK-LM3S-DRV8312采用DRV8312三相馬達驅動(dòng)器和Stellaris MCU,是中電壓數字馬達控制(DMC)套件,能驅動(dòng)三相BLDC和永磁同步馬達,輸入電壓最大52.5V,每相連續輸出電流最大3.5A,峰值電流6.5A,驅動(dòng)器開(kāi)關(guān)頻率高達500kHz.本文介紹了DRV8312/32主要特性,系統框圖,三相應用框圖和DRV8312應用案例電路圖,以及DK-LM3S-DRV8312主要特性, 馬達驅動(dòng)系統框圖, DRV8312評估板電路圖和PCB布局圖.
The DRV8312/32 are high performance, integrated three phase motor drivers with an advanced protection system.
Because of the low R_DS(on) of the power MOSFETs and intelligent gate drive design, the efficiency of these motor drivers can be up to 97%, which enables the use of smaller power supplies and heatsinks, and are good candidates for energy efficient applications.
The DRV8312/32 require two power supplies, one at 12 V for GVDD and VDD, and another up to 50 V for PVDD. The DRV8312/32 can operate at up to 500-kHz switching frequency while still maintain precise control and high efficiency. They also have an innovative protection system safeguarding the device against a wide range of fault conditions that could damage the system.

DRV8312/32主要特性:
High-Efficiency Power Stage (up to 97%) with Low R_DS(on) MOSFETs (80 m at T_J = 25°C)
Operating Supply Voltage up to 50 V (70 V Absolute Maximum)
DRV8312 (power pad down): up to 3.5 A Continuous Phase Current (6.5 A Peak)
DRV8332 (power pad up): up to 8 A Continuous Phase Current ( 13 A Peak)
Independent Control of Three Phases
PWM Operating Frequency up to 500 kHz
Integrated Self-Protection Circuits Including Undervoltage, Overtemperature, Overload, and Short Circuit
Programmable Cycle-by-Cycle Current Limit Protection
Independent Supply and Ground Pins for Each Half Bridge
Intelligent Gate Drive and Cross Conduction Prevention
No External Snubber or Schottky Diode is Required

DRV8312/32應用:
BLDC Motors
Three Phase Permanent Magnet Synchronous Motors
Inverters
Half Bridge Drivers
Robotic Control Systems

圖1.DRV8312/32系統框圖

圖2.DRV8332三相應用框圖

圖3.DRV8312三相應用框圖

圖4.DRV8312應用案例電路圖

采用DRV8312和Stellaris MCU的三相BLDC馬達驅動(dòng)套件DK-LM3S-DRV8312
The Medium Voltage Digital Motor Control (DMC) kit (DK-LM3S-DRV8312), shown in Figure 5, provides a great way to learn and experiment with digital control of medium voltage brushless motors to increase efficiency of operation. This document describes the DRV8312 hardware, and explains the functions and locations of jumpers and connectors present on the board.

圖5. DK-LM3S-DRV8312外形圖(Stellaris®版本)

圖6.DRV8312基板外形圖

DK-LM3S-DRV8312主要特性:
• Three-Phase Power Stage, DRV8312 capable of driving three-phase brushless DC motors and Permanent Magnet Synchronous Motors 52.5 V DC max input voltage
6.5 A peak with a 3.5 A max continuous output current per phase Up to 500 khz driver switching frequency
• 24 V switching power supply with on-board regulation for powering other analog and digital circuitry
• Isolated CAN and SPI communication (controlCARD support-dependent)
• Closed-loop digital control with feedback using the Stellaris microcontroller’s on-chip PWM and ADC peripherals
JTAG connector for external emulators (not used with Stellaris microcontrollers) Quadrature Encoder Interface (QEI) available for speed and position measurement  Hall-Sensor Interface for sensored three-phase motor control
High precision, low-side current sensing using the Stellaris microcontroller’s high-performance ADC, Texas Instruments’ OPA365A high-speed op-amps, and Texas Instruments’ REF3025 high precision voltage reference chip
Three PWM DACs generated by low-pass filtering the PWM signals to observe the system variables on an oscilloscope to enable easy debug of control algorithms
Over-current protection on the inverter stage, DRV8312

圖7.馬達驅動(dòng)系統框圖

圖8. DRV8312評估板電路圖(1)

圖9. DRV8312評估板電路圖(2)

圖10. DRV8312評估板電路圖(3)

圖11. DRV8312評估板電路圖(4)

圖12. DRV8312評估板元件布局圖