Question

(b) A MOSFET with no heat sink absorbs a thermal power of 2W. The thermal resistance from junction to ambient is 40°C/W, if the ambient temperature is 30°C. i. Determine the junction temperature. ii. If the maximum junction temperature is 150°C, how much power can be absorbed without requiring a heat sink? (c) The maximum junction temperature of a bipolar junction transistor is $J_{max} = 150°C$ and the maximum power dissipation is 2.0 W at ambient temperature $T_A = 25°C$ and 40 W at case temperature $T_C = 25°C$. i. List two types of power losses which lead to heat generation in the power semiconductor devices. ii. Calculate the maximum allowable power dissipation of the transistor operating in ambient temperature of 50°C in free air environment.

          (b) A MOSFET with no heat sink absorbs a thermal power of 2W.
The thermal resistance from junction to ambient is 40°C/W, if
the ambient temperature is 30°C.
i. Determine the junction temperature.
ii. If the maximum junction temperature is 150°C, how much
power can be absorbed without requiring a heat sink?
(c) The maximum junction temperature of a bipolar junction
transistor is $J_{max} = 150°C$ and the maximum power
dissipation is 2.0 W at ambient temperature $T_A = 25°C$ and 40
W at case temperature $T_C = 25°C$.
i. List two types of power losses which lead to heat
generation in the power semiconductor devices.
ii. Calculate the maximum allowable power dissipation of the
transistor operating in ambient temperature of 50°C in free
air environment.

(b) A MOSFET with no heat sink absorbs a thermal power of 2W.
The thermal resistance from junction to ambient is 40°C/W, if
the ambient temperature is 30°C.
i. Determine the junction temperature.
ii. If the maximum junction temperature is 150°C, how much
power can be absorbed without requiring a heat sink?
(c) The maximum junction temperature of a bipolar junction
transistor is Jmax = 150°C and the maximum power
dissipation is 2.0 W at ambient temperature TA = 25°C and 40
W at case temperature TC = 25°C.
i. List two types of power losses which lead to heat
generation in the power semiconductor devices.
ii. Calculate the maximum allowable power dissipation of the
transistor operating in ambient temperature of 50°C in free
air environment.

Added by Joshua B.

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