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用UC3842设计电源中的变压器响声问题

Other Parts Discussed in Thread: UC3842

单端反激电源,采用TI的UC3842作为控制芯片。

将示波器探头加在MOS管的DS上测量波形,变压器响声小;

将其探头去掉,变压器响声大了,请问这是什么原因造成的?