SDAA218 November   2025 DRV8363-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Power Loss and Thermals in Motor Driver Systems
    1. 2.1 Conduction Losses
    2. 2.2 Switching Losses
      1. 2.2.1 Effect of Switching Frequency
  6. 3Real World Motor Driver Limitation
    1. 3.1 Electro-Magnetic Interference (EMI) – System Noise Considerations
    2. 3.2 Motor Driver Voltage Tolerance
  7. 4Summary
  8. 5References

4 Summary

As BLDC systems transition to 48V in automotive systems, it is important to note that MOSFET switching losses are no longer negligible. The shift from conduction dominated to switching dominated losses changes the optimization methods for motor drive systems.

Higher slew rate can help to reduce the switching losses, but it is important to consider the adverse effects of a faster slew rate such as EMI and ringing. If the slew rate is too excessive, the system can be vulnerable to voltage overshoot, capacitive coupling, and even unwanted turn-ons. PCB layout and proper selection of source and sink current settings are critical to optimizing the system. By balancing these factors, designers can create a robust 48V system using DRV8363-Q1, which is not limited by the slew rate capability of the device.