AN827 Datasheet, PDF (18/20 Pages) STMicroelectronics – A 500W HIGH POWER FACTOR WITH THE L4981A

AN827 APPLICATION NOTE
An Application Program named Designing PFC [3] is available for the designer. This program allows the design-
er to make changes to the input/output design specifications and calculates and selects the component values
and types. For example, this program can easily convert this design to single mains operation (120 or 240 Volts).
The results are presented in two screens, the schematic and parts list, and may be sent to a printer for a hard-
copy for future reference. Two solutions at 110Vac (fig. 4) and 220Vac (fig. 5) are shown below.
Figure 4. 400W/230V; V_in = 110V ± 20V
18/20