This application note describes a 150W rating design guideline for LED street lighting. The application design consists of CRM PFC and LLC SRC with high power factor and high power conversion efficiency using FL7930B and FAN7621S.
This document describes a design guideline for a 150W AC-DC converter for LED street lighting applications. The design utilizes a two-stage topology consisting of a Critical Conduction Mode (CRM) Power Factor Correction (PFC) stage and a Low-Loss LLC Series Resonant Converter (SRC) DC-DC stage. The application uses the FL7930B controller for the boost PFC and the FAN7621S controller for the LLC SRC to achieve high power factor and high efficiency.
| Power Rating | 150W |
|---|---|
| Input Voltage | 103V AC |
| Output Current | 1.46A |
| DC-DC Topology | LLC Series Resonant Converter (SRC) |
| Maximum Switching Frequency | 300kHz |
The design uses the FL7930B for active PFC and the FAN7621S for the LLC SRC DC-DC converter.
The circuit consists of a CRM PFC converter in the front end and an LLC SRC DC-DC converter in the back end.
The maximum switching frequency of the FL7930B is limited to 300kHz to prevent severe switching losses at light-load conditions.