This application note describes a demonstration board based on the transition-mode PFC controller L6562A and presents the results of its bench demonstration. The board implements a 400 W, wide-range mains input PFC pre-conditioner suitable for ATX PSU, flat screen displays, etc. In order to allow the use of a low-cost device like the L6562A at this power level, usually prohibitive for this device, the chip is operated with fixed-off-time control. This allows continuous conduction mode operation, normally achievable with more expensive control chips and more complex control architectures.
The document details an EVL6562A-400W demonstration board based on the transition-mode PFC controller L6562A. The board implements a 400 W, wide-range mains input PFC pre-conditioner suitable for ATX power supplies and flat-screen displays by operating the chip with fixed-off-time (FOT) control to achieve continuous conduction mode.
| Line voltage range | 90 to 265 Vac |
|---|---|
| Regulated output voltage | 400 V |
| Rated output power | 400 W |
| Maximum switching frequency | 85 kHz |
| Minimum estimated efficiency | 90 % |
The demonstration board delivers a rated output power of 400 W.
Yes, the board is designed to meet the European norm EN61000-3-2.
The board uses fixed-off-time (FOT) control to allow continuous conduction mode operation.