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基于lmr14020的buck-boost电路

Other Parts Discussed in Thread: LMR14020

我这边用LMR14020做了一个buck-boost电路,输入12v输出-12v,这个电路正常工作。

我通过修改FB脚上的电阻,想要在输入+15v时输出-15v的电压,结果这样输出就只有-13v多,我把输入从5v开始往上加,一直到12v左右都可以输出-15v,一旦输入电压过了这个点,sw波形都乱了,看上去像是只能工作于boost模式