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LM5116电源输出低及输出跳变的问题

Other Parts Discussed in Thread: LM5116

1.焊接了2块LM5116的板子,正常要求是输出24.4V 20A ,现在2个板子情况分别如下:

第一个板子:输出5.6v电压偏低

第二个板子:空载的时候输出24.4V,接20R负载 输出电压跳变,电压从24.4掉落到23v然后又一下子拉到25v ,然后听到像开关的声音,这个声音是mos管开关引起的吗???