SLYT819 October   2021 BQ25980

 

  1. 1 Introduction
  2. 2 Delivering over 100 W power with USB PD
  3. 3 High-efficiency switched-capacitor DC/DC converters
  4. 4 Output impedance
  5. 5 Switching losses
    1. 5.1 Turnon switching loss
    2. 5.2 Turnoff switching loss
    3. 5.3 Gate driving loss
  6. 6 Dual-phase interleaved switched-capacitor converter
  7. 7 High-power-density switched-capacitor converter
  8. 8 Switched-capacitor converter application: fast charging for portable devices
  9. 9 Conclusion
  10. 10Related Websites
  11. 11Important Notice

5 Switching losses

A main advantage of switched-capacitor converters is switching loss reduction, as expressed in Equation 8, which includes the IV overlap loss (PIV), gate driving loss (PGATE), output junction capacitance loss (POSS), dead-time loss (PDT) and reverse-recovery loss (PQRR). The switched-capacitor converter eliminates the IV, dead-time and reverse-recovery losses.

Equation 8. P S W = P I V + P G A T E + P O S S + P D T + P Q R R