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Hi
建议电感饱和电流超过1A, 输入电容可以适当加大一点点,并且尽量靠近电感输入端。同时输入走线宽一点。
然后做一下启动测试,确认在启动瞬间,SW脚是否有方波震动,如果完全没有反应,很可能你买的芯片是有问题的。
如果有方波,按照上面的确认做。