This application note describes an evaluation board based on the Transition-mode PFC controller L6563 and presents the results of the bench evaluation. The board implements a 400 W, wide-range mains input, a PFC pre-conditioner suitable for ATX PSU, or a flat screen display.
This document describes an evaluation board based on the Transition-mode PFC controller L6563. The board implements a 400 W, wide-range mains input PFC pre-conditioner suitable for ATX power supplies or flat-screen displays. It utilizes Fixed-Off-Time control to allow Continuous Conduction Mode operation with a low-cost device.
The evaluation board (EVAL6563-400W) delivers 400 W continuous power on a regulated 400 V rail. It is designed to meet European norm EN61000-3-2 and Japanese norm JEIDA-MITI regarding harmonic reduction. The note includes test results, significant waveforms, layout hints, and a bill of materials.
| Rated output power | 400 W |
|---|---|
| Regulated output voltage | 400 V |
| Line voltage range | 90 to 265 Vac |
| Minimum line frequency | 47 Hz |
| Maximum switching frequency | 85 KHz |
| Minimum estimated efficiency | 90% |
| Maximum ambient temperature | 50 °C |
| EMI compliance | EN55022 Class-B |
The evaluation board delivers 400 W continuous power on a regulated 400 V rail.
The design uses the L6563 controller chip, which integrates functions to control the PFC stage and interface with downstream converters.
Yes, the board is able to reduce harmonics well below the limits of European norm EN61000-3-2 and Japanese norm JEIDA-MITI.