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TPS65131: -15V输出异常

Part Number: TPS65131


目前我司新案在用TPS65131这颗芯片,设计为±15V电压输出,现在发现使用一段时间之后-15V经常失效,芯片已损坏,PWM波形也没有了,正常情况下使用电流是90mA左右,麻烦帮忙看下是不是设计有问题还是会有其它问题导致,谢谢!一下为设计: