Silanna Semiconductor and Transphorm Develop GaN Adapter Reference Design

Article By : Transphorm Inc.

Transphorm's GaN-based solution delivers groundbreaking power density and efficiency.

Transphorm Inc. and Silanna Semiconductor have developed an open frame, 65W USB-C Power Delivery (PD) charger that combines Transphorm’s SuperGaN Gen IV platform with Silanna Semiconductor’s proprietary Active Clamp Flyback (ACF) PWM controller.

Together, the technologies yield an unprecedented peak efficiency of 94.5 percent with an uncased power density of 30W/in3. These performance levels outpace the currently available competing solutions using silicon superjunction MOSFETs or e-mode GaN transistors, and furthermore utilize a smaller GaN FET from Transphorm. Silanna Semiconductor and Transphorm’s universal GaN adapter design is ideal for powering laptops, tablets, smartphones and other IoT devices.

The new reference design relies on advanced technologies from both Transphorm and Silanna Semiconductor. The SuperGaN FET is Transphorm’s TP65H300G4LSG, a 650V 240mΩ device in an industry standard PQFN88 package. It leverages the SuperGaN Gen IV platform, which uses advanced epi and patented design technologies to improve performance. The robust GaN FET also offers the high reliability synonymous with Transphorm devices, including the industry’s best gate robustness. And, unlike e-mode devices, protective external circuitry such as additional bias rails or level shifters are not needed—an advantage that produces higher efficiency. Collectively, these and other features further increase the adapter system’s overall power density and reduce BoM costs.

Silanna Semiconductor’s SZ1130 fully-integrated ACF PWM controller features an adaptive digital PWM controller, an Active Clamp FET, an Active Clamp Gate Driver, and a UHV Startup regulator. As an ACF solution, it delivers higher performance than competing quasi-resonant (QR) controllers and offers the simplest design in the smallest PCB area among all ACF controllers in the market. Silanna Semiconductor’s technology-agnostic design focuses on the ultimate power management challenges with the best-in-class power density and efficiency that delight customers with unprecedented BoM savings.

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