User`s guide

SMPS AC/DC Reference Design User’s Guide
DS70320B-page 28 © 2008 Microchip Technology Inc.
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.