Hi Team,
I refer to this application report to calculate Tj.
http://www.ti.com/lit/an/spra953c/spra953c.pdf
When I use Tb and Tc to calculate the Tj, the results are very different (nearly 20 ℃)!I wonder which one is more reliable …
- Use Tb to calculate Tj
Tj=Tb+Power*ψjb/℃
|
|
LMR36015 |
|
Tb/℃ |
40 |
|
Pd/W |
1.248382609 |
|
ψjb/℃/W |
23.5 |
|
Tj/℃ |
69.3369913 |
- Use Tc to calculate Tj
Tj=Tc+Power*ψjt/℃
|
|
LMR36015 |
|
Tc/℃ |
46.8 |
|
Pd/W |
1.248382609 |
|
ψjt/℃/W |
0.8 |
|
Tj/℃ |
47.79870609 |
