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UCC28056: 采用辅助绕组供电和ZCD检测

Part Number: UCC28056

大家好:

对于UCC28056的供电,官方的参考设计是外置一路独立电源供电,请问一下,能否在PFC电感/变压器上增加一组辅助绕组并在降压后对芯片供电?如果可以的话,匝数应该如何确定?

此外,对于一些CRM模式的PFC控制器,它们会利用辅助绕组进行ZCD检测,请问UCC28056是否也具有相关功能?是否有相关电路推荐?

期待您的回复!