用LM5175做一个升降压电路,输入电压9-36V 输出电压12V 最大电流为5A。假设输入电压为15V时能够正常稳定输出12V 5A，当调整输入电压变低时，输出电压也会跟着变低。15V以上就可以正常工作。也就是说感觉整个电路都是一直处于BUCK模式，根本没有进入buck-boost模式。麻烦帮忙指出是哪里有问题！！
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