H.W2 Sow at to an 9 • A Power transistor for which TJmax = 180°c Can dissipate a case temperature of so°c. If it is connected heat sink using insulating washer for which the thermal resistance is 0.6 °C /w, what heat sink temp. necessary to ensure safe operation at 30w ? For an ambient temp. at 39°℃, what heat sink thermal resistance is required? If a praticular aluminum finned heat sink, thermal resistance in still air is 4.5°C /w per centimeter of length, how long a heat Sink is needed?
H.W2 Sow at to an 9 • A Power transistor for which TJmax = 180°c Can dissipate a case temperature of so°c. If it is connected heat sink using insulating washer for which the thermal resistance is 0.6 °C /w, what heat sink temp. necessary to ensure safe operation at 30w ? For an ambient temp. at 39°℃, what heat sink thermal resistance is required? If a praticular aluminum finned heat sink, thermal resistance in still air is 4.5°C /w per centimeter of length, how long a heat Sink is needed?
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:Sow at
to
an
H.W₂ • A Power transistor for which TJmay = 180°c Can dissipate
a case temperature of so°c. If it is connected
heat sink using
insulating washer for which the
thermal resistance is 0.6 °C /w, what heat sink temp.
necessary to ensure safe operation at 30w? For an
ambient temp. at 39°℃, what heat sink thermal
resistance is required? If a praticular aluminum
finned heat sink, thermal resistance in still air is
4.5°C /w per centimeter of length, how long a heat
Sink is needed?
Ans: Ts = 84°C
OSA = 1.5°C/W; heat sink length
is 3 Cm
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