UCC28710: 技术咨询

你好，

    辅源设计中使用UCC28710，输入300-600V，输出120V/0.3A。

    问题：输出120V，开机时变压器会响一下，带载0.1A~0.3A时变压器啸叫，负载越重声音越大。请问一下：UCC28710是怎么改变开关频率的，我在datasheet里面没看到(噪音应该是开关频率掉到20khz以下的范围了，要不然是听不到的)。

UCC28710辅助电源问题.docx

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