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2011 飞兆半导体公司 www.fairchildsemi.com Rev. 1.0.0 ? 10/16/13 AN-9738 使用 FL7930B 和FAN7621S 的150 W LED 路灯电源设计指南 引言 该应用指南介绍额定功率150 W的LED 路灯设计准则. 该应用设计包括采用 FL7930B 和FAN7621S 具有高功 率因数和高功率转换效率的 CRM PFC 和LLC SRC.为 了验证应用电路和方案的有效性,本应用指南中采用了 一个

150 W (103 V/1.46 A) AC-DC 转换器演示板作为 实例并演示了结果.在CRM 有源 PFC 中,最受欢迎的 拓扑是升压转换器.这是因为升压转换器具有连续的输 入电流,能够通过峰值电流模式控制技术进行控制,从 而迫使峰值电流跟踪线路电压的变化.FAN7930B 是一 款有源功率因数校正 (PFC) 控制器,用于在临界传导 模式 (CRM) 下运行的升压 PFC 应用.自从二十世纪九 十年早期首次引入后,LLC-SRC(串联谐振转换器)已 成为最受欢迎的拓扑结构,这是因为它具有很多卓越的 性能表现,如开关频率调节、整个负载范围的 ZVS 性能、低关断电流、采用集成变压器的小型谐振元件、零 电流开关 (ZCS)、并且次级整流器上没有反向恢复损耗 .? 图1显示典型的应用电路,其中 CRM PFC 转换器位于 前端,LLC SRC DC-DC 转换器位于后端.FL7930B 和FAN7621S 可在中等功率范围实现较高的效率,适用于