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TPS40210 输出15V有问题

采用TI的方案 PMP5859.2方案输出15V 1A 电路的参数一样,但是在实际测试过程中发现。空载情况下输入采用可编程电源为5V输入,限流2A。输出电压达不到要求,RC振荡的频率以及电压幅值是对的。并且开启限流之后,输入电压在跳动(输入电流过大,将电源电压拉下来了),从驱动MOS管的波形来看,开关频率相当低,MOS管和电流检测电阻发热严重。