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

4.2 DRV8161/DRV8162 – Externally Generated Gate Drive Supply

DRV816x family of devices use a bootstrap topology with externally supplied gate drive voltage using the GVDD pin. With an externally supplied voltage to charge the bootstraps and supply the low side VGS voltage, the average gate current can be drawn from this external supply. As long as the external supply is properly designed to supply the needed current to recharge the bootstraps and supply the low side gate charge for the chosen MOSFETs, then the driver can be used to drive said MOSFET. In the case of Example 2, the external supply needs to be designed to support an average gate current of 21.6mA.