用LM5175做一个升降压电路,输入电压20-29.6V 输出电压28V 最大电流为7A。假设输入电压为26V时能够正常稳定输出28V 7A，当调整输入电压变低时，输出电压也会跟着变低。但是如果一开始给个低的电压，则能够稳定输出28V 7A。因为是用电池作为输入，电池的电压会随使用时间降低，附件为原理。麻烦帮忙看下哪里问题！！
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