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请教DAC7744被烧坏的问题。

Other Parts Discussed in Thread: DAC7744, TPS65130

求助关于电极板之间放电会导致DA芯片被烧坏的问题。图中上下极板之间在正常工作时的电压在15KV左右,高压放大器限流为20KV,所有的接地都是汇总后通过同一点接地,一旦极板间放电电路板上的DAC7744芯片就会被烧坏,即使在DA与高压放大器加入光耦隔离也没有起到作用。

请教电路设计有可能出现的问题及解决方法。