This paper describes a flyback converter design method based on L6561, which has good performance and low power consumption characteristics, suitable for medium and low power applications
This document explains how the L6561, a Power Factor Correction (PFC) controller typically used in boost stages, can be successfully applied to flyback converters. It highlights the device's unique advantages, such as low current consumption and micro-power startup, making it suitable for cost-effective medium-low power applications.
The note details three specific configurations for L6561-based flyback converters: Transition Mode (TM), Synchronised, and High-PF. It analyzes the characteristics, benefits, and drawbacks of each configuration to help designers identify the most suitable application for their specific needs, providing circuit examples for auxiliary power supplies and multi-output SMPS.
| Startup current | 50µA typ. |
|---|---|
| Quiescent current | 3mA typ. |
| Overvoltage protection | two-level |
| Power range | up to 100 W |
The L6561 offers low current consumption, micro-power startup current, and very low quiescent current, making it attractive for medium-low power applications.
The document describes Transition Mode (TM), Synchronised, and High-PF configurations.
The typical startup current is 50µA.