SLUP412 February   2022 LMG3522R030-Q1


  1. Introduction
  2. Comparing Different Technologies
  3. Advantages of Integrating the Driver With GaN FETs
  4. The GaN-Based 6.6-kW OBC Reference Design
  5. PFC Stage
  6. DC/DC Stage
  7. DC/DC Topology Selection
  8. Frequency Selection
  9. Core Loss
  10. 10Loss of ZVS
  11. 11Dead Time
  12. 12ISR Bandwidth
  13. 13Overall
  14. 14Resonant Tank Design
  15. 15Thermal Solution
  16. 16Layout Best Practices
  17. 17Control-Loop Considerations
  18. 18Conclusions
  19. 19References
  20. 20Important Notice


Figure 18-1 shows a picture of the final converter, while Figure 18-2 shows the end-to-end efficiency operating at the highest output current condition. The power density of the design came out at 62.5 W/inch3, or 3.8 kW/L.

GUID-20220218-SS0I-3TRC-KXWX-9HKNCZ76CFWP-low.jpg Figure 18-1 6.6-kW OBC with liquid-cooled cold plate.
GUID-20220218-SS0I-JMNB-VRFM-RSDV0QG5V1VG-low.png Figure 18-2 Measured system efficiency of the 6.6-kW OBC.

GaN’s fast switching performance enables high-frequency power supplies that reduce size while maintaining high efficiency. With these high frequencies, a variety of challenges emerge, requiring cost-effective countermeasures that help maximize the benefits that come from high-speed switching.