Silanna, Transphorm team on 65W USB-C PD GaN adapter reference design

May 18, 2021 // By Nick Flaherty
Silanna, Transphorm team on 65W USB-C PD GaN adapter reference design
Transphorm’s GaN FETs and Silanna Semiconductor’s controller enable 30W/in3 power density and 94.5 percent efficiency

Transphorm has teamed up with Silanna Semiconductor on an open frame, 65W USB-C Power Delivery (PD) charger reference design using gallium nitride (GaN) FETs.

The design combines Transphorm’s 650V SuperGaN Gen IV FETs with Silanna’s proprietary Active Clamp Flyback (ACF) PWM controller and Weltrend’s WT6633P USB PD controller for powering laptops, tablets, smartphones and other IoT devices.

The TP65H300G4LSG a 650 V 240 mΩ GaN FET is in an industry standard PQFN88 package and unlike e-mode devices, protective external circuitry such as additional bias rails or level shifters are not needed. This helps increase the overall power density and reduce the BoM costs.

Silanna’s SZ1130 is a fully-integrated ACF PWM controller that integrates an adaptive digital PWM controller, an Active Clamp FET, an Active Clamp Gate Driver, and a UHV Startup regulator. This provides higher performance than competing quasi-resonant (QR) controllers and offers the simplest design in the smallest PCB area.

The overall design has a power density of 30 W/in3 and up to 94.5 percent efficiency.

“Transphorm and Silanna Semiconductor offer best-in-class performance in a complete GaN-based reference solution for USB-C PD adapter customers by pairing our SuperGaN devices with Silanna Semiconductor’s novel and highly integrated active clamp flyback controller,” said Tushar Dhayagude, Vice President Field Applications and Technical Sales, Transphorm. “Our GaN FETs are known to improve efficiency, power dissipation and size of AC/DC chargers, particularly when compared to competitive e-mode GaN and integrated GaN IC solutions. Our partnership is a powerful combination of two innovators that will positively impact the adoption of GaN in power adapters worldwide.”

“Our ACF controllers are versatile and provide the design flexibility for the charger manufacturers to select their preferred FET technology. The ACF controller is delivering 94.5 percent efficiency with the combination of our SZ1130 and Transphorm’s TP65H300G4LSG, achieving industry-leading performance,” said Ahsan Zaman, Director of Marketing, Silanna Semiconductor. “At Silanna Semiconductor, we are extremely excited to further advance the best-in-class efficiency and power density results by combining our knowledge and expertise with technology ecosystem partners to deliver some of the world’s most innovative products.”

The 65W USB-C PD GaN power adapter reference design’s schematic, design files, and bill of materials are available from both manufacturers.

www.transphorm.com; www.silanna.com

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