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TPS65217,AC输入5V,SYS只有1.5V的输出

Other Parts Discussed in Thread: TPS65217

TPS65217,AC输入5V,SYS只有1.5V的输出,测了好几片,都是一样的1.5V,然后DCDC和LDO都是没有输出,这是什么原因导致的?