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TI工程师您们好，我有两个问题请教，烦请百忙之中抽空解答一二：
1. UCC28056这个芯片最高工作频率支持多少？
2. UCC28056这个芯片可以应用于“带回程二极管的无桥APFC电路”中吗？如果可以请问设计中有什么特别需要注意的地方吗？
