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LM2588升压电源

Other Parts Discussed in Thread: LM2588

问:我按照TI上的资料电路原理图做的,输出也是正确的,5V输入12V输出。但是当输出电流达到0.7A的时候芯片就开始发烫。不知道这是什么原因。请指导,谢谢