April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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371Thermal Analysis and Design
This is for the typical PC board-mounted application where only the PC board traces are
used to conduct the heat a
way from the diode. The typical value range of the lead-to-air
thermal resistance is between 30 to 40 C/W and is a variable which is dependent on the
lead length.
There are some heatsinks for radially-leaded diodes that solder to one of the leads. These
are also available from the transistor heatsink manufacturers. In this situation the thermal
equation (see Figure 12.6b ) becomes
TPRRT
jDJLSAA(max)
()
(12-4)
These heatsinks will help a marginal heat situation. The alternati ...
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