(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)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Qa: A transistor dissipates 50W in an ambient temperature of 60°C, the thermal resistances are 0-0.5 °CW¹, 8ca-4 °CW. Determine the junction temperature without a heat sink. Determine the thermal resistance of the heat sink to avoid the junction temperature exceeding 180°C. )
Q2: A transistor dissipates 50W in an ambient temperature of 60°C, the thermal resistances are 0-0.5 °CW¹, 8ca-4 °CW'. Determine the junction temperature without a heat sink. Determine the thermal resistance of the heat sink to avoid the junction temperature exceeding 180°C. 3
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