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TPS62136: 高温输出不稳

Part Number: TPS62136


你好,

TPS62136, 输入5V,输出1.8V,实际电流大概0.2A, 最近在温箱55度,实际PCB温度大概70度的情况下,出现某一时刻开始输出电压降低且不稳定。同一PCB上我们还使用了这款芯片输出1V, 电路上仅2.2uH电感型号不一样,观察到1V很稳定。

请问:是什么原因导致图片波形这种情况?