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LM25117问题



18到32V转12v,设置输出电流3A,两个问题,首先空载时候能达到设定电压,但是芯片有啸叫声,想请教啸叫声一般是什么原因造成的,其次,加上负载时,输出电压被拉低,请问拉低的原因可能是什么