This reference design is a 450W high-efficiency and super transient AC/DC converter for desktop PC PSUs: gaming PC PSUs: entry-level server PSUs: and other low-cost AC/DC PSUs. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit: followed by an LLC-based second stage. The design uses the UCC28180 controller for the PFC stage and UCC256301 controller for the LLC stage to achieve a compact and robust control structure. Synchronous rectification based on the UCC24612 and low RDS(on) FETs aids in achieving higher efficiencies. This reference design can be used as an AC/DC supply in many applications demanding efficient and super transient power conversion.