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此图是官方例程中测得的buck电路的bode图。我自己按照例程中的代码进行调试，首先进行开环测试，测得的结果如下图所示：
然后进行了闭环测试，发现很诡异，结果就这样了：
我自己用的是28069芯片，请用过SFRA的大神帮我度过难关，感激不尽！
