This application note describes the design guidelines of a 75W universal-input, single-stage power factor correction (PFC) for LED lighting applications. It utilizes a flyback converter topology controlled by the critical conduction mode control IC, FAN7530, and incorporates several functions such as CV/CC mode feedback circuits, cycle-by-cycle current limit, soft-starting function, etc., specifically for LED lighting applications.
This document describes the design of a single-stage power factor correction (PFC) converter for LED lighting. It utilizes the FAN7530 critical conduction mode (CRM) controller to achieve a 75W output with universal input voltage support (85-265V ac). The design focuses on a flyback topology that eliminates the need for an inductive output filter, relying on the transformer for filtering.
| Input Voltage Range | 85~265V ac |
|---|---|
| Output Voltage | 45V |
| Output Limit Voltage | 50V |
| Minimum Switching Frequency | 50kHz |
| Efficiency | 85% |
| MOSFET Selection | FQPF8N80C |
| FRD Selection | FO6UP20S |
The design example presents a 75W single-stage flyback AC-DC converter.
The converter supports a universal input voltage range from 85V to 265V ac.
The design uses the FAN7530 as the controller for the flyback converter.