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

7 Older Designs

Earlier motor drive systems used simple 3-phase gate drivers or half bridges to drive the MOSFETs. Some of these devices had 3-4A peak gate drive current and needed to be scaled down using series gate resistors to limit the gate current. The resistance was used to tune the VDS slew rate. With earlier calculations on rise or fall times and gate current, there is evidence that 1/2A peak current is more than sufficient for many robotics and factory automation systems.

With TI’s Smart Gate drive technology, the series gate resistor might not be needed resulting in lower build cost and board space savings.