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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1035840/tps61089-the-switching-frequency-in-psm-thermal-metric
各位专家、您好！
1.我的客户对 PSM 中的开关频率感到困惑、您能提供详细推导吗？
表6.4下的结至外壳(底部)热阻为何大于结至电路板热阻？
此致、
戈登
您好、Gorden、
1.我没有找到你提供的方程式，你在哪里看到了？
2.本文档详细介绍了热阻：
https://www.ti.com/lit/an/spra953c/spra953c.pdf?ts=1631600062059
