This application note describes a demonstration board based on the new transition-mode PFC controller L6563S and presents the results of its bench evaluation. The board implements a 250 W, wide-range mains input PFC pre-conditioner suitable for desktop PCs, industrial SMPS, flat screen displays, and all SMPS having to meet the IEC61000-3-2 or the JEITA-MITI standard.
This document describes a demonstration board (EVL6563S-250W) based on the new transition-mode PFC controller L6563S. The board implements a 250 W, wide-range mains input PFC pre-conditioner suitable for desktop PCs, industrial SMPS, and flat screen displays to meet IEC61000-3-2 or JEITA-MITI standards.
The main characteristics of the SMPS include a line voltage range of 90 to 265 Vac, a regulated output voltage of 400 V, and a rated output power of 250 W. The power stage is a conventional boost converter, and the board includes features such as voltage feed-forward, brown-out protection, and power management functions.
| Line voltage range | 90 to 265 Vac |
|---|---|
| Line frequency | 47 to 63 Hz |
| Regulated output voltage | 400 V |
| Rated output power | 250 W |
| Maximum 2f, output voltage ripple | 20 V pk-pk |
| Hold-up time | 10 ms |
| Minimum switching frequency | 40 KHz |
| Minimum estimated efficiency | 93 % |
| Maximum ambient temperature | 50 °C |
The minimum estimated efficiency is 93% at an input voltage of 90 Vac and an output power of 250 W.
The IC shuts down (not latched) and its consumption drops to a considerably lower level.
If the voltage on pin #7 exceeds 2.5 V, the IC stops switching and restarts when the voltage falls below 2.4 V.