如附件图所示，用LM5119做了一个30V转12V@30A的电源，发现在生产过程中不良率很高，维修发现主要是损坏LM5119的第2和第23脚，在板测量对地阻抗为100多欧，请教是什么原因造成这种不良，有什么办法避免？
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