TransphormHighest Performance, Highest Reliability GaN


65 W USB-C PD Power Adapter (open frame) Reference Design using Active Clamp Flyback (ACF) Technology

The TDADP-SIL-USBC-65W-RD is an open frame 65 W universal USB-C Power Delivery (PD) power adapter reference design. It meets USB PD 3.0 requirements for universal chargers supporting smartphones, laptops and other IoT devices . The power supply uses the Silanna SZ1130 Active Clamp Flyback (ACF) PWM controller with an integrated active clamp circuit; Transphorm's TP65H300G4LSG (650 V, 240 mΩ GaN FET); and Weltrend’s WT6633P USB PD controller. This design enables high power density (30 W/in3 and up to 94.5 percent efficiency with the combination of Transphorm’s GaN and Silanna’s ACF controller.


  • USB-C PD 3.0
  • Power: 65W
  • Input Voltage: Universal (90 Vac to 265 Vac)
  • Switching frequency: up to 140kHz
  • Features TP65H300G4LSG
  • Features SZ1130
  • Easy-to-use platform to investigate GaN


  • Smart phones
  • Fast charging
  • Laptops and IoT


Typical Performance Curves

Output Power (W)

Output Power (W)

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