TPS54260
SLVSA86 –MARCH 2010
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Capacitors generally have limits to the amount of ripple current they can handle without failing or producing
excess heat. An output capacitor that can support the inductor ripple current must be specified. Some capacitor
data sheets specify the Root Mean Square (RMS) value of the maximum ripple current. Equation 36 can be used
to calculate the RMS ripple current the output capacitor needs to support. For this application, Equation 36 yields
238 mA.
2 ´ DIout
Cout >
¦sw ´ DVout
(32)
Ioh2 - Iol2
(
)
Cout > Lo ´
V¦2 - Vi2
(
)
(33)
(34)
1
1
Cout >
´
VORIPPLE
IRIPPLE
8 ´ ¦sw
32
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