SLVAFZ3 December   2024 DRV8161 , DRV8162 , DRV8350 , DRV8350F , DRV8353 , DRV8353F

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Power Requirements
  6. 3Motor Current and MOSFET Selection
    1. 3.1 How Does a BLDC Motor Driver System Work?
    2. 3.2 Motor Current and QG Value Relation
    3. 3.3 Role of a Motor Driver
    4. 3.4 Can my MOSFET be Driven or Commutated?
      1. 3.4.1 Example 1 – Medium Power (4.8kW – 48V × 100A)
      2. 3.4.2 Example 2 – High Power (19.2kW – 48V × 400A)
  7. 4Motor Driver Specifications to Consider
    1. 4.1 DRV8353 - Internally Generated Gate Drive Supply
    2. 4.2 DRV8161/DRV8162 – Externally Generated Gate Drive Supply
  8. 5Advantages of TI’s BLDC Drivers With Smart Gate Drive
  9. 6Maximum Source and Sink Current and QGD
  10. 7Older Designs
  11. 8Summary
  12. 9References

8 Summary

The rise of factory automation and humanoid robotics has increased the efficiency and volume of production and assembly of various components. These advancements have been centered around BLDC motors delivering the precise control with high power output needed in these applications. The power needed in these systems directly relate to the current needed to be delivered by the power stage of the motor driver. The heavier the payload to be lifted the greater the motor current needed to deliver the torque from the motor. The gate driver is utilized to adjust the gate current needed to charge the gate of the MOSFET based on the VDS slew time required for the given application.

TI’s Smart gate drivers are able to deliver up to 1/2A peak source/sink current, along with several smaller gate current options. Thus, enabling fine tune control of slew rates needed to drive high power systems seen in factory robots. By offering various gate current levels, the gate drivers are suited to drive various sized MOSFETs depending on the application, while potentially eliminating the need for series gate resistors seen in non-Smart Gate Drivers.