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(b) Figure Q.2(b) shows the power derating curve for a power transistor. It is rated for a maximum power dissipation of 115 W at a case temperature of 25 °C. The specified derating factor is 0.657 W/C. The transistor has a thermal resistance case to ambient Reca-7 °C/W. Calculate the following: (0) thermal resistance junction to case, Rose of the transistor. (ii) maximum power dissipation of the transistor at case temperature of 60°C. (iii) maximum power dissipation of the transistor at ambient temperature of 40°C. (iv) new value of RecaA if the maximum power dissipation of the transistor is 50 W at ambient temperature of 40 °C. 160 P. POWER DISSIPATION (WATTS) 8 8 8 8 8 8 8 140 120 100 60 40 20 0 25 50 75 100 125 150 175 200 Tc. CASE TEMPERATURE (C)

(b) Figure Q.2(b) shows the power derating curve for a power transistor. It is rated for a maximum power dissipation of 115 W at a case temperature of 25 °C. The specified derating factor is 0.657 W/C. The transistor has a thermal resistance case to ambient Reca-7 °C/W. Calculate the following: (0) thermal resistance junction to case, Rose of the transistor. (ii) maximum power dissipation of the transistor at case temperature of 60°C. (iii) maximum power dissipation of the transistor at ambient temperature of 40°C. (iv) new value of RecaA if the maximum power dissipation of the transistor is 50 W at ambient temperature of 40 °C. 160 P. POWER DISSIPATION (WATTS) 8 8 8 8 8 8 8 140 120 100 60 40 20 0 25 50 75 100 125 150 175 200 Tc. CASE TEMPERATURE (C)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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(b) Figure Q.2(b) shows the power derating curve for a power transistor. It is rated for a maximum power dissipation of 115 W at a case temperature of 25 °C. The specified derating factor is 0.657 W/°C. The transistor has a thermal resistance case to ambient RecA= 7 °C/W. Calculate the following: (0) thermal resistance junction to case, Reic of the transistor. (ii) maximum power dissipation of the transistor at case temperature of 60°C. maximum power dissipation of the transistor at ambient temperature of 40°C. (iv) new value of Reca if the maximum power dissipation of the transistor is 50 W at ambient temperature of 40 °C. Po, POWER DISSIPATION (WATTS) 160 140 120 100 80 60 40 20 O 25 50 75 100 125 150 175 200 Tc. CASE TEMPERATURE ("C) Figure Q.2(b): Power Derating Curve
Transcribed Image Text:(b) Figure Q.2(b) shows the power derating curve for a power transistor. It is rated for a maximum power dissipation of 115 W at a case temperature of 25 °C. The specified derating factor is 0.657 W/°C. The transistor has a thermal resistance case to ambient RecA= 7 °C/W. Calculate the following: (0) thermal resistance junction to case, Reic of the transistor. (ii) maximum power dissipation of the transistor at case temperature of 60°C. maximum power dissipation of the transistor at ambient temperature of 40°C. (iv) new value of Reca if the maximum power dissipation of the transistor is 50 W at ambient temperature of 40 °C. Po, POWER DISSIPATION (WATTS) 160 140 120 100 80 60 40 20 O 25 50 75 100 125 150 175 200 Tc. CASE TEMPERATURE ("C) Figure Q.2(b): Power Derating Curve
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