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LMR16030: 初期上电正常,但在几分钟后芯片外壳炸裂。

Part Number: LMR16030

大部分电路板都正常运行,偶尔会有几个电路板,上电运行正常,但是三分钟之后关机,拆开后发现DCDC芯片外壳炸裂。而且在原理图中,原设计师在续流二极管前加了一个贴片磁珠,是起什么作用的?