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LM5175输出电压随输入电压降低

Other Parts Discussed in Thread: LM5175

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!!