June 2006
Intermediate to advanced
528 pages
17h 12m
English
Content preview from Switching Power Supplies A - Z
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Conduction and Switching Losses
From C=Q/V applied at point circled
g
Io
Vt +
Integrating I=CdV/dt over region t3
(note: voltage swings from Vin to 0)
Qgd = Cgd × Vin
Qg = Ciss × (0.9 × Vdrive) + Qg
d
Qgs = Ciss ×
Separating region t3, applying C=Q/V at
point circled, then introducing t3 again
t1+t2
0
0
Idrive × dtQgs =
t1+t2+t3
t1+t2
Idrive × dtQgd =
t1+t2+t3+t4
Idrive × dtQg =
Note: Idrive is the
current through Rdrive
Note: Coss (or Cds) cannot be determined
from gate charge factors for that we nee
d
to separately consult the tables or curves
Qg
Qgd
Qgs
t1+t2
t3
t1+t2 t3 t4
Vdrive
Vdrive
Vdrive
Gate-to-Source Voltage
Time
Gate Charge Definitions In terms of Capacitances ...
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