2

3

2

LM3481, LM3481-Q1

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SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014

Typical Applications (continued)

8.2.2.2.7

Output Capacitor Selection

The output capacitor of the SEPIC sees very large ripple currents similar to the output capacitor of a boost

converter. The rms current through the output capacitor is given by:

(64)

The ESR and ESL of the output capacitor directly control the output ripple. Use capacitors with low ESR and ESL

at the output for high efficiency and low ripple voltage. Surface mount tantalums, surface mount polymer

electrolytic and polymer tantalum, Sanyo- OSCON, or multi-layer ceramic capacitors are recommended at the

output for low ripple.

8.2.2.3 Application Curve

Figure 37. Start-Up Pattern for a 5-Vin, 12-Vout SEPIC Converter on LM3481 SEPIC Evaluation Module

(C2: Vin, C3:Vout)

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