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LM3150电感有声音,输出波纹大

Expert 1550 points
Other Parts Discussed in Thread: LM3150

无负载电压波纹

高侧MOS

低侧MOS

FB脚波形

原理图

在没有加Cac的时候电感会叫,加了后声音有所减少。MOS,IC,电感都不热。各位前辈请指点我下,谢谢。

mos用的是LR7843(wenku.baidu.com/link