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TPS54260发烫问题

Other Parts Discussed in Thread: TPS54260

在使用TPS54260设计中发现,输入15v,输出12v,输出电流2A,会出现芯片工作正常,但是芯片温度升高很多,测温枪测试温度在70多度,有可能还在继续上升,担心损坏芯片就没有持续在进行测试。请帮忙分析下哪有出现问题。如下是原理图和板子散热图以及pcb。