Design consideration

AN2649

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1

Design consideration

The following PFC design example is referred to as an experimental board, used for

demonstration purposes as described in AN628 (please refer to 2 in Bibliography on

page 18). The design target specifications are:

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DC output regulated voltage VO = 400 V

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Rated output power PO = 200 W

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Full-load output ripple

∆Vout-ripple = ± 8 V

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Maximum overvoltage value

∆Vout = 50 V

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Maximum Inductor current ripple

∆IL = 35% of ILrms

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Worst-condition efficiency (at minimum input voltage)

η= 90%

The guidelines for controller design (L4981A) and power component selection can be found

in AN628 (please refer to 2 in Bibliography on page 18). In the next section instead we will

discuss the choice of the power MOSFET and boost diode.