User guide for Fairchild FL7733_L52U050A 50 W LED driver evaluation board, covering specs, PCB layout, schematics and performance data.
This guide provides an overview of the FL7733 primary‑side regulation (PSR) controller used in a 50 W LED driver with a wide input voltage range. It describes the controller’s features, internal block diagram, and protection functions such as LED short/open protection, VDD over‑/under‑voltage and over‑temperature safeguards.
The document includes detailed specifications of the evaluation board, photographs, PCB dimensions, schematic diagrams, a complete bill of materials, transformer design information, and measured performance results such as efficiency, power factor, THD and temperature limits. This manual is written in Chinese.
| Input voltage range | 90 VAC – 277 VAC |
|---|---|
| Output voltage range | 7 V – 55 V |
| Nominal output current | 1.0 A |
| Efficiency at 120 VAC | 88.96 % |
| Power factor / THD at 230 VAC | 0.944 / 5.36 % |
| Maximum component temperature | 68 °C |
The board operates from 90 VAC to 277 VAC input voltage.
The nominal output current is 1.0 A.
The efficiency at 120 VAC input is 88.96 %.