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开关电源的频率和纹波的频率与幅值有怎样的关系呢??
开关频率越大是不是负载PSRR的响应就越不理想呢?例如650KHZ与1MHZ
上图描述了输出纹波的由来！纹波是输出直流电压的波动，波动频率与开关的频率相同；其大小与开关电源的输入电容和输出电容的容量及品质有关。
纹波公式：
公式中很明显与fs、Resr等参数有关。
