高功因多段式线性 LED 驱动方案

Richtek Multi-string Linear power solution for LED Lamp

【方案介绍】
RT7321 work for 220Vac input, RT7322 work for 110Vac input
No electrolytic capacitor and transformer required
High Power Factor >0.9
Programmable LED current (WQFN-20L 5x5 Package)
Easy EMI Solution
Minimized BOM cost and space required

【方案特色】
Unique 2 Parallels and 2 Series driving method to achieve better LED utilization, 16% greater than 4 Series driving method
Gain more lumen with the same LED, or Save LED chip for the same lumen
High efficiency : around 80%
High Power Factor: >0.9

【系统方块图】


【規格說明】
RT7321 for 220V Light bulb


RT7322 for 110V Light bulb


本方案来自大联大云端