This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8245-Q1: 关于芯片DRV8245-Q1(封装HTSSOP)如何使用热阻算出结合部温度Tj的疑问

Part Number: DRV8245-Q1


背景:当IC正常动作状态时,外壳温度(Tc)通过实验可测,且功率损耗(Power)已知的情况下算出结合部温度。

TI提供计算结合部温度的资料,对于使用下面(RθJC(top) /RθJC(bot)/ΨJT)哪一个热阻来计算Tj较为准确产生疑问。

计算公式参考:

  1. Tj=Tc+ RθJC(top)*Power
  2. Tj=Tc+ RθJC(bot)*Power
  3. Tj=Tc+ ΨJT *Power