April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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141Non-isolated Circuits
We pick the output capacitor to give the desired output ripple, again allocating two-thirds
of the ripple v
oltage to ESR and one-third to X
C
. The output ripple current is given by:
II
RMS OUT
(DC/( DC))
/
1
12
We use the equations shown in the buck converter section to calculate the capacitor value
and determine the required ESR.
The gate voltage of the MOSFET is set by the internal voltage regulator to 5.2 V. This
will require a logic level MOSFET. The drain voltage is equal to V
IN
V
OUT
. The peak
MOSFET current is I
IN
I
OUT
. The peak diode current and peak reverse voltage are
equal ...
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