PowerInt LYT4324E PAR38 LED灯高效电源方案(DER－396)
PowerInt公司的LYTSwitch－4系列产品LYT4324E把控制器和高压大功率FET组合在同以封装中,控制 器提供高的功率因素和恒流输出,具有优于±5%的恒流性能,TRIAC调光,全亮度的起动时间小于250ms,功率因素大于0.9,高达92%的效率,开关频率132kHz可使用较小的磁性材料.主要用在大功率LED驱动.本文介绍LYTSwitch－4系列产品主要特性,框图和典型电路,以及可替代PAR38灯的采用LYT4324E的20W高效TRIAC调光LED驱动器主要特性,电路图,材料清单和PCB元件布局图.
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主要特性:
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
High Performance, Combined Driver, Controller, Switch
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