April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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273Conduction and Switching Losses
So the total switc
hing loss (in the switch) is
Psw Pcross P Cds_ watts147 0025 15.. .
The driver dissipation is
Pdrive Vdrive Qg fsw
4 5 10 5 10 0 081
95
..36 watts
Note that, typically, the above driver dissipation equation underestimates the actual
driver dissipation by almost 20%, as can be confirmed by integrating the product of the
drive current and the voltage across it, over each subinterval. The reason for the error is
simply the Miller plateau—because during this interval, some additional current (other
than from the stored charge Qg ), gets injected into the dri ...
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