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为什么我的LM2587老烧?

Other Parts Discussed in Thread: LM2587

我的电源:输入16-24V,输出2组 5V 1A ,12V 0.5A,输入输出需要隔离。但是

稍微带200mA负载,LM2587就烧,已烧了好几个,不知为什么。电路如下: