As USB-C PD expands to 240W, charger design has emerged as a necessity for system-level implementation rather than simple component combination. Topology must vary according to output—flyback, QR-ZVS, active clamp, and PFC+hybrid flyback configurations—and high-frequency design combining GaN (CoolGaN) and OptiMOS is required to achieve high power density. The PD controller handles not only communication but also power negotiation, protection, and multi-port power distribution, which determines system stability. Infineon presents reference designs scalable from 45W to 240W and emphasizes that high-output USB PD can secure competitiveness only through integrated optimization of cables, protection circuits, thermal management, and EMI.