Vivanco UNIVERSAL SWITCHMODE AC TO DC MAINS ADAPTERS WITH USB CHARGING FUNCTION Guia do Utilizador descarregar pdf (Página 32)

SMPS AC/DC Reference Design User’s Guide

FIGURE 2-2: INPUT VOLTAGE RIPPLE CURRENT VARIATION

FIGURE 2-3: CORE LOSSES FOR PFC CHOKE

2.1.1.4 PFC OUTPUT CAPACITOR

The PFC output capacitor provides bulk capacitance on the output of the PFC Boost

converter and smooths the DC voltage input to the ZVT Full-Bridge converter. The size

of the capacitor is dictated by the hold-up requirements of the SMPS, its AC ripple

current and thermal lifetime under normal operating conditions.

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Vivanco UNIVERSAL SWITCHMODE AC TO DC MAINS ADAPTERS WITH USB CHARGING FUNCTION Guia do Utilizador Página 32