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

4 65W AC-DC USB PD Charger Based on VCC Self-Biasing GaN Flyback

PMP41117 DesignFigure 4-1 PMP41117 Design
Table 4-1 PMP41117 Design Parameter
ParameterValue
AC Input voltage90-264VAC
Output voltage5-20V/3.25A
TransformerATQ23-14
Turn ratio7:1
Transformer Inductance200uH
Switching frequency90-140kHz
Efficiency93.2% at 90VAC
Power density2.3W/CC

Figure 4-1 and Table 4-1 show a 65W dual USB port AC-DC USB PD charger design. Leveraging the simplified VCC self-bias circuit and the advanced high-level integration of the GaN-based design which uses the UCG28826, this design achieves a power density of 2.3W/cc and an efficiency of 93.2% for the AC-DC conversion stage.