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LM3447 恒功率问题

Other Parts Discussed in Thread: LM3447

请问,LM3447 不调光,CC 模式时,轻载时不能正常工作,满载才可以,这是怎么回事?

 Input 110Vac type, output 55V/0.6A.

        LM3447 可以用隔离反馈方式吗,隔离反馈需要怎么接才好,谢谢!