This application note describes how to use the L6561 controller to replace magnetic amplifiers in computer power supplies for secondary regulation.
This document proposes a switch-mode architecture as an alternative to magnetic amplifiers (mag amps) for generating auxiliary regulated power rails in multi-output switching power supplies. The traditional mag amp approach is described as expensive, bulky, and difficult to design. The proposed solution replaces the saturable core reactor with a power MOSFET and utilizes the L6561 Transition Mode PFC controller in a non-conventional way to achieve better performance and lower cost.
| Supply Voltage Range | 13 < V < 18 |
|---|---|
| Internal Reference Voltage | 2.5V |
They are expensive, bulky, slow, inefficient, and difficult to design.
A power MOSFET replaces the saturable core reactor.