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TPS54560DDA降压电路,电感有啸叫声。

如图所示,这个电路电感的啸叫声比较大。电感选用的是一体成型电感,饱和电流9.8A。调试时在输出地方又加了470UF的电解电容,啸叫声小了一些,但是凑近耳朵听还是会听到。然后开关频率我实际量的时1.8M。现在不知道怎么处理这个啸叫声,望高人指点。