Fairchild Semiconductor FL7730 Design Tool Flow Application Note

About this manual

This document serves as a design guide for the Fairchild Semiconductor FL7730, intended to be used in conjunction with the product datasheet. It outlines a structured process for designing a dimmable single-stage PFC PSR offline LED driver, guiding engineers through specific design stages.

What's inside

• Overview
• Transformer Design
• Snubber Design
• Control Circuit Design
• Power Device Design
• DIM Detection Circuit Design
• Passive Bleeder Design
• Active Damper Design
• Related Resources
• Disclaimer

Frequently asked questions

What is the maximum recommended switching frequency for the design?

The switching frequency should be less than 65kHz.

What is the maximum allowed value for the compensation resistor Rec?

Rec should be limited to less than 500 ohm.

What is the general range for the Zener voltage of ZDdim?

The Zener voltage of ZDdim is generally in 10~40V.