Reference design cuts complexity in USB-C adapters
Eggtronic has announced a 140-W USB-C Power Delivery (PD) 3.1 AC/DC reference design for notebook adapters and other USB-C powered devices. The evaluation board combines Eggtronic’s EPIC dual-controller chipset with Renesas’ TP70H150G4LSG 700-V, 150-mΩ SuperGaN FET, achieving 95.5% peak efficiency and more than 92% efficiency at light loads.
Unlike conventional USB-C adapters that rely on costly LLC, AHB, or ACF topologies, the EPIC-based design retains the simplicity and BOM cost of a QR flyback converter. The primary-side controller (EPIC2ACB04) manages both the active totem-pole PFC front end and QuarEgg ZVS flyback switching stage, while the secondary-side companion controller (EPIC2ACQ07) handles synchronous rectification, output-voltage regulation, and USB PD 3.1 protocol management.
Operating from a universal input of 90 VAC to 264 VAC, the system provides an output of up to 28 V at 5 A. It also features optoless digital isolation, replacing optocouplers and digital isolators with an integrated high-speed, ultra-low-latency digital feedback loop for improved transient response and reliability.
The 140-W USB-C PD 3.1 reference design is available now.
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