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

1 Motor Considerations and Why Brushless DC Motors?

Brushless-DC (BLDC) motor usage is becoming more and more common for various applications due to the performance benefits they have over alternate motor types such as brushed-DC and stepper motors. As Table 1-1 shows, BLDC motors are more efficient, quieter, and have better power density, higher torque, higher speed, and longer lifetime when compared to brushed-DC and stepper motors.

Table 1-1 Comparison of Motor Types
Motor Type Pros Cons
Brushless DC Long life, quiet, optimal power density Design complexity, higher cost
Brushed DC Low cost, easy to use Noisy, EMI wear-out, sparking
Stepper Long life, quiet, open-loop position and speed control Current control needed, not as power efficient as BLDC, noisy

The significant benefits that BLDC motors have come with one important disadvantage: higher design complexity. Product development with BLDC motors requires knowledge of how to design an efficient system and get the motor to spin. Texas Instrument’s BLDC team is working to reduce this barrier to entry and simplify BLDC design with innovative motor driver devices. This document serves to simplify BLDC design by exploring the considerations in selecting a BLDC motor driver (Figure 1-1).

Figure 1-1 Motor Driver Considerations and Selection Process