[原创]Onsemi NCP1680图腾柱临界导通模式(CrM) PFC解决方案

Onsemi公司的NCP1680是图腾柱临界导通模式(CrM) PFC控制器,用来驱动无桥图腾柱PFC拓扑. 无桥图腾柱PFC是功率因素修正架构,包括PWM开关频率的快速开关腿驱动和工作在AC线路频率的第二腿.这种拓扑不需要通常PFC电路中所用的二极管桥,从而大大地改善了功率级效率.在非常轻的负载采用跳跃模式和有所权的电流检测方案,数字电压回路补偿,AC线路监测电路和AC相位检测,所有工作模式具有接近1的功率系数.主要用在功率因素修正,工业电源和离线电源.本文介绍了NCP1680主要特性和主要优势,应用电路以及评估板NCP1680 EVB主板和子板主要指标,电路图,材料清单和PCB设计图与变压器数据表.

NCP1680: Totem Pole Critical Conduction Mode (CrM) Power Factor Correction Controller

The NCP1680 is a CrM PFC controller IC designed to drive the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency.

NCP1680主要特性:

Totem Pole PFC Topology Eliminates Input Diode Bridge

Critical Conduction Mode (CrM) Operation

Discontinuous Conduction Mode (DCM) with Valley Turn On Under Light Load Condition

Frequency Foldback in DCM With 25 kHz Minimum Frequency

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