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带PFC的500W电源用什么什么芯片好(用BOOST拓朴结构升压到400V输出)?

Other Parts Discussed in Thread: UCC28070, UCC28019

本人对PFC电路了解不是很多,如何根据功率去选择PFC芯片,对功率的合适不合适的判定依据是什么?500W是不是要用工作在连续模式的控制或交错IC?如果应用UCC28070,它的性价比怎么,能否推荐一款适合此电路的芯片?