April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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145Non-isolated Circuits
The data sheet also gives an equation in terms of X
C
, R
OUT
, and ESR:
VVV
C
R
RIPPLE(P-P)
IN
OUT
OUT
OUT
(( ) | |)
CC
ESR
2
1
1
4
12
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Since R
OUT
is 70 , ESR of a ceramic capacitor will not contribute to that term. 10 F is a
reasonable start for C
OUT
. This yields ripple voltage of:
V
RIPPLE(P-P)
(( . ) | . |)
F
.F F
250 90
1
1
410
027 027
.
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13mV
Tantalum capacitors will have ESR on the order of 0.5–3 in this capacitance range and
voltage range (depending on manufacturer and technology), so the ripple voltage will be
signifi cantly ...
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