TIDUET3 Design guide

TIDUET3 February 2021

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2.4.2.9 LLC Output Capacitors

The LLC converter topology does not require an output filter, although a small second-stage filter inductor can be useful in reducing peak-to-peak output noise. Assuming that the output capacitors carry the full wave output current of the rectifier, the capacitor ripple current rating is:

Equation 42.

The RMS current rating of the capacitor is:

Equation 43.

The ripple current rating for a single capacitor may not be sufficient, so multiple capacitors are often connected in parallel.

Equation 44.