Powerint LYTSwitch－4大功率LED驱动电源解决方案
Powerint公司的LYTSwitch-4大功率LED驱动器系列产品LYT4221-4228/4321-4328集成了控制器和高压功率FET,控制器提供高功率因素和恒流输出,包括了振荡器,反馈电路,5.9V稳压器,滞后的超温保护,频率抖动,逐个周期限流,自动重起,电感修正,功率因素和恒流控制.本文介绍了LYTSwitch-4系列产品亮点,框图,典型应用电路以及20W/36V TRIAC调光高功率因素LED驱动器设计电路和用于PAR30灯的采用LYTSwitchTM-4 LYT4322E的14.35W高效(>86%)高功率因素(>0.95)TRIAC调光LED驱动器主要指标,电路图,材料清单和PCB布局图.
A LYTSwitch-4 device monolithically combines a controller and high-voltage power FET into one package. The controller provides both high power factor and constant current output in a single-stage. The LYTSwitch-4 controller consists of an oscillator, feedback (sense and logic) circuit, 5.9 V regulator, hysteretic over-temperature protection, frequency jittering, cycle-by-cycle current limit, auto-restart, inductance correction, power factor and constant current control.
LYTSwitch-4系列产品亮点:
Better than ±5% CC regulation
TRIAC dimmable to less than 5% output
Fast start-up <250 ms at full brightness
<1s at 10% brightness
High power factor >0.9 Easily meets EN61000-3-2 Less than 10% THD in optimized designs
Up to 92% efficient
132 kHz switching frequency for small magnetics ..
