April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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269Conduction and Switching Losses
8.10 Worked Example
We are switching 22 A at 15 V through a Si4442DY MOSFET, at 500 kHz.The total pull-up
drive resistance, by which the gate is driven by a pulse of amplitude 4.5 V, is 2 ohms. At
turn-off, it is pulled-down (to source) by a total drive resistance of 1 ohm. Estimate the
switching losses and the dissipation in the drive.
From Figure 8.16 , we have Cg Cgs Cgd 6300 pF.
8.10.1 Turn-on
The time constant is
Tg Rdrive Cg 2 6300 12 6pF ns.
T4 = (2.303 × Tg) − (T1 × T3)
tcross
OFF
A discharging exponential curve takes ln (1/x)
time constants to reach x times ...
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