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请教lm5007电源芯片电路问题

Other Parts Discussed in Thread: LM5007

按照这个电路接法,电路不稳压,fb反馈电压始终不是2.5左右,应该是芯片没工作,芯片内部没有开断功能,请问具体问题出在了哪里啊?这么少的元器件,遇到问题就不知道该怎么解决了,请问该从哪个方向入手