April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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Chapter 12
12.2 Power Packages on a Heatsink (to-3, to-220, to-218, etc.)
This physical situation can be modeled as shown in Figure 12.2 . The thermal equation
would look like:
TPRRRT
jDJCCSSAA(max)
()
(12-1)
Since the heatsink performs the vast majority of the heat radiation, it is assumed that all
the power fl ows through all the other thermal elements.
Temperature tests can be conducted at ambient room temperature, but the designer must
remember that the typical product is enclosed in a case and its internal temperature rise
must be added to the readings. Another consideration is the highest external ...
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