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Hi
很可能duty受限制了,这个芯片最大duty是90%,如果效率不高,或者输入有下拉,容易在输入电压偏低时出问题。
请问您有测试duty吗?
Hi
电感饱和也会造成输出电压偏低,建议您也确认一下电感的饱和电流,建议大于最大输出电流的1.3倍以上。