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UCC3895输出波形突然消失



各位前辈好,我是刚学习电路设计的学生,在用3895产生四路方波的时候,做出来的电路板工作一会后四路方波的占空比就直接跳为零了,波形也消失了,请各位前辈帮忙看看有什么问题