On behalf of customer:
Dear,
May I have your advice how do I estimate junction temperature in early stage as following?
Device: 66AK2G12
I have read/checked spra953c.pdf, sbva025.pdf, sprabi3b.pdf, or some e2e, but I cannot decipher enough how I should estimate Junction temperature(Tjunction) in early stage.
Early stage mean I can have ambient temperature(Tambient) from previous product that not uses TI processor, while I will use TI processor for next product.
Therefore I don’t have case temperature(Tcase) for TI processor, even though the Tcase should be used in following equation:
Tjunction = Tcase + (ψjt x Power) (from spra953c.pdf, page8, equation(8))
While I know also there is following equation, but as spra953c.pdf mention that usage of “Rθja” is misapplication.
Tjunction = Tambient + (Rθja x Power) (from spra953c.pdf, page2, equation(1))
Question:
Should I use following equation when I have Tambient and don’t have Tcase? Or is there another suitable equation/way when I have Tambient, don't have Tcase?
Tjunction = Tambient + (Rθja x Power) (from spra953c.pdf, page2, equation(1))
I’m sorry if I overlook something, but may I have your advice?
Best regards,
Gou