Fairchild Semiconductor FPS Off-line Forward Converter Design Guidelines

About this manual

This document presents practical design guidelines for off-line forward converters employing Fairchild Power Switch (FPS). It addresses the inherent complexity of switched mode power supply (SMPS) design by offering a structured approach to handle various design variables and trade-offs. A software design tool, the FPS design assistant, is mentioned as a companion resource containing the equations described in the paper to facilitate efficient design.

What's inside

• Introduction
• Step-by-step Design Procedure
• System Specifications
• DC Link Capacitor
• Transformer Reset Method
• Output Inductor Ripple
• Transformer Core Selection
• Winding Turns Calculation

Frequently asked questions

What efficiency range should be estimated for low voltage output applications?

If no reference data is available, set the estimated efficiency between 0.7 and 0.75.

What is the typical maximum flux density swing for most power ferrite cores?

The maximum flux density swing is typically 0.2 to 0.3 tesla.