Transphorm announces Compact 240W Power Adapter Reference Design with TO-220 GaN FETs

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Transphorm, Inc, a pioneer in and global supplier of high reliability, high performance gallium nitride (GaN) power conversion products—today announced availability of its new 240W Power Adapter Reference Design. The TDAIO-TPH-ON-240W-RD deploys a CCM Boost PFC + Half-Bridge LLC topology to deliver a peak power efficiency of over 96 percent with a power density up to 30 W/in³. Transphorm’s design uses three SuperGaN® FETs (TP65H150G4PS) each with an on-resistance of 150 milliohms. The GaN FET comes as a 3-lead TO-220, a well-known and long-trusted transistor package that offers superior thermals at lowline for higher current power systems running PFC configurations.The reference design is intended to simplify and quicken power system development for applications such as high-power density AC-to-DC power supplies, fast chargers, IoT devices, laptops, medical power supplies, and power tools.

Key Specifications and Features

The TDAIO-TPH-ON-240W-RD is a 240W 24V 10A AC-to-DC power adapter reference design. It pairs the TP65H150G4PS GaN FETs with onsemi’s off-the-shelf NCP1654 CCM PFC controller and NCP1399 LLC controller. The design uses a 25 millimeter heatsink that produces a power density of over 24 W/in³. The power density can increase by approximately 25 percent to 30 W/in³ depending on the heatsink design.

This high power density and efficiency range is primarily due to the FET’s packaging as Transphorm offers the only high voltage GaN devices in a TO-220 today. Power adapters, along with all universal AC-to-DC power supplies, require high current at lowline (i.e., 90 Vac) which can require paralleling two PQFN packages (as typically seen with e-mode GaN) to achieve the desired power output. This method reduces a power supply’s power density while requiring 2x part count. Transphorm’s TO-220 packages mitigate this, thus providing unparalleled power density at a lower cost—a result not currently possible with e-mode GaN.

Other specifications and features include: 

Operation over universal input voltage of 90 to 264 Vac
Over 96% peak efficiency and flat efficiency curve across line and load
Tight switching frequency regulation for improved input EMI filter utilization
Over 180 kHz switching frequency operation for compact implementation

The new reference design joins a broad portfolio of adapter/fast charger design tools offered by Transphorm. That portfolio currently includes five open frame USB-C PD reference designs ranging from 45 to 100 watts. It also includes two open frame USB-C PD/PPS reference designs for 65W and 140W adapters.

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