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UCC28710: 技术咨询

Part Number: UCC28710

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