求助:LM3488升压7.4V到12V2A,输出锯齿波VPP600-800mV,有滋滋的啸声!原理图是按照webench设计的!实际做样时,电感取的4.7uh,取消了97.6R的电阻(有这个电阻输入电流会增大,发热),
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97.6的电阻是用来滤波的,对功耗的影响不大,你发声应该是环路还有点问题,你看下开关节点的波形是不是正常