This whitepaper delves into the transformative impact of GaN-based bridgeless architecture on 300W AC-DC converters, achieving a power density of 1 W/cc (16 W/in³). It highlights the superior efficiency of GaN power transistors at high switching frequencies, enhancing both energy efficiency and power density. Key applications include power supplies for flat-screen TVs, all-in-one PCs, gaming devices, and small electric drives like eBikes. The paper contrasts the efficiency of silicon-based adapters and emphasizes the reduction in energy losses and thermal dissipation achieved by eliminating the four-diode bridge in conventional designs.