This reference design is a compact, high efficiency, 24-V DC, 480-W nominal, 720-W peak output reference design for industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit followed by a robust LLC stage with synchronous rectification. The design enables efficiency greater than 93.5% over a wide load range, allowing the system to work without forced cooling. The LLC stage, based on the UCC256301, takes advantage of the ZCS avoidance feature in the UC256301 to enable peak output power, minimizing the PFC bulk capacitor for meeting holdup requirements, while making the system robust to shortcircuit and overcurrent conditions. The UCC24612-2- based synchronous rectifier helps in minimizing the losses in the output rectifier.

此参考设计是用于工业AC / DC电源的紧凑型高效24V DC，标称480W，峰值720W峰值输出参考设计。 该电路包括一个前端连续导通模式（CCM）功率因数校正（PFC）电路，其后是具有同步整流功能的强大LLC级。 该设计可在较宽的负载范围内实现高于93.5％的效率，从而使系统无需强制冷却即可工作。 基于UCC256301的LLC级利用UC256301中的ZCS避免功能来实现峰值输出功率，最小化PFC大容量电容器以满足保持要求，同时使系统对短路和过流条件具有鲁棒性。 基于UCC24612-2的同步整流器有助于最大程度地减少输出整流器中的损耗。