Datasheet
Power losses and thermal design AN3303
20/27 Doc ID 18164 Rev 2
Considering now the case with SR: again the thermal rise is 65 °C. Based on the power
dissipation per MOSFET calculated in Equation 8, the maximum junction-to-ambient
thermal resistance allowed is:
Equation 14
That means that a heatsink is not required, just some copper area is needed, calculated
according to the SRK2000 datasheet indication.
The same is true for the SRK2000:
Equation 15
This is higher than the controller junction-to-ambient thermal resistance (150 °C/W).
R
th j amb–()
65°C
P
MOS
---------------
245°CW⁄==
R
th j amb–()
65°C
P
SRK2000
-------------------------
409°CW⁄==