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DCDC电源前馈电容的相关问题!!!



最近在用TPS6200设计一电路,看到DATA SHEET上给出了一个参考设计,(见图)  C1叫前馈电容,用来改善增益和相位,改善电源的瞬态响应,但我觉得C2那个电容不能加上,FB脚接芯片内部Error Amp的输入的,若加了电容,会改变采样的信号的相位(电容改相位)导致芯片输出电压不准。。。我不知道我这么理解可对???请大神解释解释。。。。谢谢。。。DATA  SHEET底下给出了Layout示例,又没加C2..............搞得有点晕了。。。见图