SLVAED3A July   2019  – April 2024 TPS568230

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Power Loss
    1. 2.1 Switching Loss
    2. 2.2 Conduction Loss
    3. 2.3 Driver Loss
    4. 2.4 Test Results
  6. 3Output Ripple
  7. 4Transient Response
  8. 5PCB Layout
  9. 6Conclusion
  10. 7References
  11. 8Revision History

2.3 Driver Loss

The switching process of MOSFET is always accompanied by the charge and discharge of the interelectrode capacitances. By controlling the gate voltage of the driving terminal and then controlling the switching of the MOSFET, driver loss occurs during this process, as follows:

Equation 4. P=Vdrive×Qg×fsw

where

  • Vdrive is the gate drive voltage
  • Qg is the gate charge factor

Qg is related to the effective input capacitance and gate drive voltage. Equation 4 shows the driver loss is also proportional to the switching frequency.