Hi Team,
I wanted to understand the difference between RθJC(top) and ψJT so I read this article.
http://www.ti.com/lit/an/spra953c/spra953c.pdf
I'd like to confirm if my understanding is correct with you.
Due to the fact that 60%-95% of heat is convected and radiated off the PCB rather than the case, equation 4 below gives false junction temperature. However, equation 4 is straightforward and widely-used in the industry. Therefore, I think the basic idea of ψJT is that it enables people to reuse the equation that they are familiar with to calculate junction temperature from IC case temperature and provides a more accurate estimation of Tj.
Do you think this makes sense?
Thanks!
Roy Hsu
