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LM5117反馈脚电压问题

Other Parts Discussed in Thread: LM5117, LM5119

今天测试了一下我做的LM5117电路,用万用表测试FB反馈脚电压显示只有0.4V左右稳定,手册上不是说基准0.8V吗,正常情况下芯片是要调节的,问什么我的芯片不调节呢?