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LM5088加负载后啸叫声音大,输出纹波过大



您好,我使用LM5088MH-1/NOPB设计了一个24V输入,负28V/2A的输出电源。系统加电后,有很微弱的啸叫声音,然后加了一个50欧姆的负载,实测电流在520mA左右,此时啸叫声音增加。我测试器件HG管脚时,发现输出的方波里边有正弦波信号叠加,请问这个现象正常不?原理图和测试结果如下图所示: