AN2951 Application note describes the design of a 3 kW fixed-off-time (FOT) power factor correction, which is suitable for most common domestic and industrial applications from low power range to high power range.
This document details the design of a 3 kW fixed-off-time (FOT) power factor correction (PFC) preregulator. It explains the FOT control method, which uses a constant off-time (Toff) and variable on-time (Ton) to modulate power, offering advantages in noise reduction and filter design compared to fixed-frequency methods. The architecture is suitable for a wide range of applications, from a few watts to thousands of watts, including air conditioning, inverters, and industrial battery chargers.
| Power Rating | 3 kW |
|---|---|
| Controller | L6562 or L6563 |
| Application Fields | air conditioning, inverters, welding machinery, industrial battery chargers |
The L6562 or L6563 controller by STMicroelectronics is suggested for implementing the fixed-off-time modulation method.
It spreads noise energy conducted on the net, resulting in a lower noise power density compared to fixed frequency modulation.