SLUAB13 April   2025 UCG28826

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2VCC Self-Bias at Different AC Line and Load Conditions
  6. 3VCC Capacitor Configuration
  7. 465W AC-DC USB PD Charger Based on VCC Self-Biasing GaN Flyback
  8. 5Summary
  9. 6References

5 Summary

The traditional VCC bias circuit of the controller, along with the associated auxiliary winding in the transformer and rectifier can be entirely eliminated by introducing a VCC self-bias circuit, which enhances the efficiency of the VCC bias circuit across a wide range of output voltages. This document provides design guidelines on sizing the VCC capacitor to verify proper operation. With this feature, engineers can achieve a more streamlined and optimized USB PD charger design.