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LMZ31704电源模块啸叫

Other Parts Discussed in Thread: LMZ31704各位好,最近用LMZ31704电源模块为DSP供电,一直听到吱吱的声音,感觉是电感啸叫,找了很久问题,后来重新焊接就不叫了,感觉像是底部41脚VOUT 42脚PH没有焊好,我的问题是周围还有几个和VOUT PH相同的管脚,底部的就算是虚焊了,照理说还是可以工作,请问为什么底部虚焊了就工作不正常,出来的电压迭代有锯齿波,而且有啸叫声?