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TPS54361: 关于电源芯片TPS54361的热阻问题

Part Number: TPS54361

我想请教设计中,到底应该选择哪个参数来计算芯片的结温呢?

是Tj=Tc+P*Rjc吗?

这里的P是指芯片本身的耗散功耗,还是指给后级电路提供的功率?