Tool/software:
Hi,
I want to use TPSM82902SISR for Vin 12V to vout 2.5V @ Iout 1A.
Power = (12-2.5)*1 = 2.8W
Per datasheet Rthja = 58.2
Ta = 45degC (application specific)
Tj= Ta+(Rthja*Pd)
1) Assuming Rthja = 48.7, Tj = 181.36 and assuming Rthja = 58.2, Tj is 207 degC. Both these are higher than the Tj limit
In webbench, I find that for the same application, Ic Tj is 74.98 deg C.
Can you pls share why the Tj is different between the calculation and webbench value. Which is the correct approach?
2) If the webbench considers layout implementation to calculate Rthja/Tj, since we are in design stage how to use the correct estimate?
3) For the above application, is this a suitable part to go ahead with?
Thanks
