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TPS5430负电压输出问题

    +12V转-12V

     4700PF实际改为300nF,11.3K实际改为13K,1N5819改为SS34丝印贴片二极管。此时已有输出,为-12.6V,且已带负载工作过。

而后约么一天左右PCB板子再通电,检测不到-12V电压。此时输出为基本为0,10mV级别,芯片无发烫现象,测得电源脚和GND电阻大约250欧,1脚PH电压9.2V

更换BOOT启动电容后,此时电压有异常,在0.8V左右100mV飘忽不定,芯片发烫。

希望坛友能帮忙分析一下