April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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89DC-DC Converter Design and Magnetics
If for example, if the drain-to-source resistance is 0.5, the dissipation in the MOSFET is
PI R
SW IRMS_SW DS
W any topology
22
086 05 037... ( )
Note that the general switch selection procedure is as follows:
The rule-of-thumb is to pick a switch with a current rating at least equal to, but preferably
at least twice the worst-case RMS switch current calculated above (for low losses, since
the switch forward drop will decrease substantially if its current rating is increased)
Its voltage rating is usually picked to be at least 20% higher ( “ 80% derating ” —i.e.
safety margin) ...
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