SLVAES1A June   2020  – May 2022 DRV8300

 

  1.   Trademarks
  2. 1Motor Considerations and Why Brushless DC Motors?
  3. 2Motor Driver Architecture
    1. 2.1 Gate Driver vs Integrated FET Driver: Power, Voltage, and Current Requirements
    2. 2.2 Three Use Cases: Speed, Torque, or Position:
    3. 2.3 Control Methods: Trap, Sine, or FOC
      1. 2.3.1 Trapezoidal
      2. 2.3.2 Sinusoidal
      3. 2.3.3 Field-Oriented Control
    4. 2.4 Sensored Versus Sensorless
      1. 2.4.1 Sensored
      2. 2.4.2 Sensorless
    5. 2.5 Current Sense Amplifiers
    6. 2.6 Interface
    7. 2.7 Power Integration
    8. 2.8 100% Duty Cycle Support
  4. 3Texas Instruments' Brushless-DC Motor Drivers
    1. 3.1 Gate Drivers: DRV8x and DRV3x family
      1. 3.1.1 DRV8x Family
      2. 3.1.2 DRV3x Family
    2. 3.2 Integrated MOSFET: DRV831x Family
    3. 3.3 Control and Gate Driver: MCx Family
    4. 3.4 Full Integration: MCx831x and DRV10x Family
      1. 3.4.1 MCx831x Family
      2. 3.4.2 DRV10x family
  5. 4Conclusion
  6. 5Revision History

3.2 Integrated MOSFET: DRV831x Family

Figure 3-4 Integrated FET Architecture for DRV831x Families

TI’s DRV831x family include integrated MOSFET solutions to further save board space and reduce overall system cost. Integrated MOSFET solutions provide efficient switching and current control to maximize output current capability from a single integrated circuit. To control MOSFET switching, many integrated and external MOSFET architectures utilize 1x, 3x, 6x, or tSPI control schemes. These PWM modes allow the designer to support various commutation and control methods as well as free up I/O pins for the MCU. TI provides a variety of low power (<15W) and medium-power (<70W) integrated MOSFET solutions.

Many integrated MOSFET drivers includes three integrated CSAs to sense low-side FET current, which removes the need for external shunt resistors. Additionally, some devices include adjustable buck regulators and LDOs to provide external supply rails in a thermally efficient package. Integrated MOSFET drivers provide a variety of configurable protection features to guard the device against abnormal supply voltages, overcurrent events, or overtemperature.

Figure 3-5 Simplified Schematics for DRV8311 and DRV8316 Integrated FET Drivers