Chapter 8, Problem 8.9P

For a power MOSFET, ${\theta }_{dev-case}=1.5\text{°C/W}$ , ${\theta }_{snk-amb}=2.8\text{°C/W}$ , and ${\theta }_{case-snk}=0.6\text{°C/W}$ . The ambient temperature is $25\text{°C}$ . (a) If the maximum junction temperature is limited to $T_{j,\max }=120\text{°C}$ , determine the maximum allowed power dissipation. (b) Using the results of part (a), determine the temperature of the case and heat sink.