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Chapter 12: Problem 23

Determine the maximum dissipation allowed for a \(100-\mathrm{W}\) silicon transistor (rated at \(25^{\circ} \mathrm{C}\) ) for a derating factor of \(0.6 \mathrm{~W} /{ }^{\circ} \mathrm{C}\) at a case temperature of \(150^{\circ} \mathrm{C}\).

Short Answer

Expert verified
The maximum dissipation allowed for the 100-W silicon transistor under the given conditions is 25W.

Step by step solution

01

Identify Given Values

We first identify and list down the given values: The rated power \(P_{rated}\) is 100 W, the derating factor is 0.6 W/°C, the case temperature \(T_{case}\) is 150°C, and the rated temperature \(T_{rated}\) is 25°C.
02

Substitute Values into Equation

We next substitute the given values into the formula for maximum power dissipation: \(P_{max} = P_{rated} - Derating Factor * (T_{case} - T_{rated}) = 100 W - 0.6 W/°C * (150°C - 25°C)\).
03

Calculate the Maximum Power Dissipation

We simplify the expression in the previous step and calculate the result: \(P_{max} = 100 W - 0.6 W/°C * 125°C = 100 W - 75W = 25W\).

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Most popular questions from this chapter

A class A transformer-coupled amplifier uses a \(25: 1\) transformer to drive a \(4-\Omega\) load. Calculate the effective ac load (seen by the transistor connected to the larger turns side of the transformer).

Calculate the harmonic distortion components for an output signal having fundamental amplitude of \(2.1 \mathrm{~V}\), second harmonic amplitude of \(0.3 \mathrm{~V}\), third harmonic component of \(0.1 \mathrm{~V}\), and fourth harmonic component of \(0.05 \mathrm{~V}\).

Sketch the circuit diagram of a quasi-complementary amplifier, showing voltage waveforms in the circuit.

Calculate the efficiency of a class \(\mathrm{B}\) amplifier for a supply voltage of \(V_{C C}=22 \mathrm{~V}\) driving a 4- \(\Omega\) load with peak output voltages of: a. \(V_{L}(\mathrm{p})=20 \mathrm{~V}\). b. \(V_{L}(\mathrm{p})=4 \mathrm{~V}\)

Draw the circuit diagram of a class A transformer-coupled amplifier using an \(n p n\) transistor.
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