Fairchild FAN9673 5KW电源PFC控制方案
Fairchild公司的FAN9673是交叉三路连续导通模式(CCM)功率因素修正(PFC)控制器,可编程工作频率范围18 kHz~40 kHz或55 kHz~75 kHz,可编程PFC输出电压,并具有多种保护功能如峰值电流限制,输入电压暂断保护和TriFault Detect™功能,主要用在大功率AC/DC电源,DC马达电源,白色家电如空调电源,服务器和通信电源以及工业焊接电源.本文介绍了FAN9673主要特性,功能框图, 三路PFC控制器典型应用电路图以及5kW评估板主要特性与指标,电路图,材料清单和PCB元件布局图.
The FAN9673 is an interleaved three-channel Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller IC intended for PFC pre-regulators. Incorporating circuits for the implementation of leading edge, average current, and “boost”-type power factor correction; the FAN9673 enables the design of a power supply that fully complies with the IEC1000-3-2 specification. Interleaved operation provides substantial reduction in the input and output ripple currents and the conducted EMI filtering becomes easier and cost effective.
An innovative channel management function allows the power level of the slave channels to be loaded and unloaded smoothly according to the setting voltage on the CM pin, improving the PFC converter’s load transient response.
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