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Open frame 300 W Constant Current Constant Voltage (CCCV) AC-DC Battery Charger Reference Design using Transphorm SuperGaN Technology

The TDAIO-TPH-ON-CCCV-300W-RD is an open frame universal input line voltage AC-DC battery charger reference design with an output power level of 300 W. This design is composed of two power stages, the first being the PFC (AC to DC) and the second being the LLC (DC to DC). Its peak efficiency is greater than 95% at 264 Vac input.

The power supply uses the ON Semi PFC controller (NCP1654) at the first stage and LLC controller (NCP1399) at the second stage; Transphorm's 3x TP65H070G4PS (650 V, 72 mΩ GaN FET). This battery charger is ideal for applications such as LED dimmable drivers, gaming devices, fast charging, etc.


  • Power: 300W
  • Efficiency: Peak Efficiency 95% @ (264 Vac)
  • Input Voltage: Universal (90 Vac to 264 Vac)
  • Switching frequency (variable): up to 150 kHz
  • Features TP65H070G4PS
  • Features NCP1654 PFC
  • Features NCP1399 LLC


  • High-Power-Density AC/DC Battery Chargers (CCCV)
  • High-Power-Density AC/DC CV Power Supplies
  • High-Power-Density AC/DC LED Dimmable Drivers
  • Gaming Devices
  • Fast charging
  • Laptops and IoT devices


Typical Performance Curves

Output Power (W)

Output Power (W)

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