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lm5118电感有点轻微响声

Other Parts Discussed in Thread: LM5118

lm5118输出正常,但电感有点轻微响声,测得电感的波形如图,改过输出电解电容,和反馈电路,波形大概样子都一样就周期会改变。想请教下各位前辈这是什么原因造成的