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LM5010芯片烧问题

Other Parts Discussed in Thread: LM5010

从TI官网设计了降压电路,用LM5010, 输入:64V  输出:15V 然后现在情况是,基本可以输出,但如果开关电源次数一多(5次内) 芯片左下角就会烧毁 不知道什么原因

本人是个菜鸟

这个电路是自己用万用板焊接的 但已经重新焊过两套了 还是烧芯片

请问是不是这么高的电压 必须制作PCB ?