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LM25116电源很不稳定

Other Parts Discussed in Thread: LM25116

LM25116电源很不稳定,带载能力差,工作一段时间电压就跌倒3V,请教下是什么PCB还是原理图设计问题,和MOS管选型有没有关系

MU-POWER BOARD-V2.0.pcb