Question 12.17: Determine what maximum dissipation will be allowed for an 80...

Determine what maximum dissipation will be allowed for an 80-W silicon transistor (rated at 25°C) if derating is required above 25°C by a derating factor of 0.5 W/°C at a case temperature of 125°C.

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P_{D}\left(125^{\circ} C \right)=P_{D}\left(25^{\circ} C \right)-\left(125^{\circ} C -25^{\circ} C \right)\left(0.5 W /{ }^{\circ} C \right)

 

= 80 W – 100 °C(0.5 W /°C) = 30 W

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