Eggtronic Unveils 140-W USB-C PD 3.1 Reference Design Combining EPIC Architecture and Renesas SuperGaN Technology

Eggtronic has announced the launch of a new 140-W USB-C Power Delivery (PD) 3.1 AC/DC reference design tailored for modern notebook adapters and a wide variety of other high-power USB-C powered devices. The newly introduced evaluation board represents a significant step forward in power conversion engineering by successfully merging Eggtronic’s proprietary EPIC dual-controller chipset with Renesas’ advanced TP70H150G4LSG 700-V, 150-mΩ SuperGaN field-effect transistor (FET). This powerful combination yields impressive performance metrics, achieving a peak efficiency of 95.5 percent alongside more than 92 percent efficiency during light-load operating conditions, addressing long-standing thermal and efficiency challenges in high-density power adapter design.

The modern consumer electronics landscape demands increasingly higher power outputs to support power-hungry laptops, tablets, and mobile workstations while simultaneously requiring chargers to become smaller, lighter, and more energy-efficient. Conventional USB-C adapters have traditionally relied on complex topologies such as LLC resonant converters, asymmetric half-bridge (AHB) architectures, or active clamp flyback (ACF) circuits to achieve high efficiency levels. However, these traditional approaches often introduce notable complexity into the circuit design and drive up the overall bill-of-materials (BOM) cost, making them challenging to optimize for mass-market commercial production.

In contrast, the newly unveiled EPIC-based reference design from Eggtronic manages to bypass these limitations entirely. By ingeniously leveraging the capabilities of advanced semiconductor devices and intelligent digital control, the design retains the inherent simplicity and cost-effectiveness typical of a traditional quasi-resonant (QR) flyback converter. This architectural choice significantly simplifies the engineering hurdles associated with high-wattage power supplies, allowing manufacturers to deliver high-performance 140-W adapters without incurring the prohibitive component costs traditionally associated with complex multi-stage topologies.

At the heart of this architecture lies Eggtronic’s sophisticated EPIC dual-controller chipset, which is split into primary-side and secondary-side management roles to ensure optimal coordination and efficiency across all operating states. The primary-side controller, designated as the EPIC2ACB04, takes charge of dual critical responsibilities within the power conversion pipeline. It simultaneously manages the active totem-pole power factor correction (PFC) front end and the QuarEgg zero-voltage switching (ZVS) flyback switching stage. By integrating both the PFC and the main conversion stage control into a single primary-side IC, the system achieves tight synchronization and reduces the physical footprint required on the printed circuit board.

Meanwhile, the secondary-side companion controller, identified as the EPIC2ACQ07, handles a complementary set of critical functions. It is responsible for managing synchronous rectification on the secondary side, maintaining precise output-voltage regulation under varying load conditions, and executing full USB PD 3.1 protocol management to ensure seamless handshake and power negotiation with connected host devices and peripherals. This clear division of labor between the primary and secondary controllers ensures that every phase of the power conversion process is monitored, regulated, and optimized in real time.

Complementing the intelligent control provided by the Eggtronic chipset is the integration of Renesas’ cutting-edge TP70H150G4LSG SuperGaN power semiconductor technology. Gallium nitride (GaN) transistors have rapidly transformed the power electronics industry by enabling much higher switching frequencies, drastically reduced switching losses, and superior thermal performance compared to legacy silicon-based counterparts. The inclusion of the 700-V, 150-mΩ SuperGaN FET enables the reference design to operate at elevated frequencies while maintaining minimal power dissipation, directly contributing to the remarkable 95.5 percent peak efficiency and the robust light-load efficiency exceeding 92 percent.

Operating flexibly from a universal AC input range spanning from 90 VAC to 264 VAC, the comprehensive power system is capable of delivering a robust output of up to 28 volts at 5 amperes, fully satisfying the rigorous power delivery profiles defined under the latest USB-C PD 3.1 specifications. This high-voltage output capability makes the reference design exceptionally well-suited for powering demanding portable electronics, including high-performance gaming laptops, professional mobile workstations, and other heavy-duty USB-C powered industrial and consumer equipment that require substantial wattage delivered safely and reliably over a single cable connection.

Another key technical highlight of the Eggtronic evaluation board is its implementation of advanced optoless digital isolation technology. In traditional power adapter designs, maintaining safety isolation between the high-voltage primary side and the low-voltage user-accessible secondary side typically requires the use of optocouplers or dedicated digital isolators. While functional, these conventional isolation components can introduce performance degradation over time, occupy valuable board space, and limit the overall dynamic response speed of the feedback loop.

Eggtronic’s optoless digital isolation approach effectively eliminates the need for traditional optocouplers and digital isolators. Instead, the design utilizes an integrated high-speed, ultra-low-latency digital feedback loop to communicate across the isolation barrier. This advanced digital feedback mechanism not only streamlines the circuit layout and enhances long-term reliability by removing wear-prone optical components, but it also delivers a marked improvement in transient response. As a result, the power adapter can respond instantaneously to sudden load fluctuations—such as when a connected notebook abruptly shifts from idle to maximum processing power—ensuring a stable and reliable voltage output under all operational scenarios.

The availability of this advanced reference design provides power electronics engineers and hardware manufacturers with a ready-to-evaluate platform that bridges the gap between high power density and cost-effective manufacturing. By combining the high-frequency advantages of Renesas SuperGaN transistors with the intelligent coordination of Eggtronic’s EPIC dual-controller architecture and optoless digital isolation, the 140-W USB-C PD 3.1 solution sets a new benchmark for what is possible in modern AC/DC power adapter design. The 140-W USB-C PD 3.1 reference design is available now for engineering evaluation and integration into next-generation power supply products.