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1、Fairchild FL7794 PWM调光大功率LED AC直接驱动方案时间：2016-06-06 12:52:06 作者：Fairchild 来源：中电网Fairchild公司的FL7794是直接从AC线驱动的LED驱动器,从而最小化外接RC无源元件的数量,输入电压90305 VAC.正常配置下一个电阻可调整LED功率,一个电容提供稳定电压来偏置内部并联稳压器.器件提供模拟/PWM可调光特性,采用高PF和低的THD可获得高效率,主要用于高稳定的大功率LED照明系统.本文介绍了FL77944主要特性,框图,以及12W评估板FEBFL77944A4测试条件,电路图和材料清单.The FL779
2、44 is a direct AC line LED driver with a minimal number of external RC passive components. In normal configuration, one resistor is to adjust LED power, and one capacitor is to provide a stable voltage to an internal biasing shunt regulator.The FL77944 provides phase-cut dimming with wide dimming ra
3、nge, smooth dimming control and good dimmer compatibility. It achieves high efficiency with high PF and low THD, which makes the FL77944 suitable for high-efficiency LED lighting systems. The FL77944 has a dedicated DIM pin which can be used with analog or digital PWM dimming. The FL77944 can also b
4、e used with a rheostat dimmer switch which is suitable for desktop or indoor lamps.Operation of FL77944 admits driving higher-wattage systems, such as street lights and down lights, by simply parallel connecting the driver ICs.FL77944主要特性:The simplest Direct AC LED Driver with Only Two External RC P
5、assive ComponentWide AC Input Range: 90305 VACFour Integrated High-Voltage LED Constant Current Sinks of up to 150 mA (RMS) CapabilityTRIAC Dimmable (Leading/Trailing Edge)Rheostat DimmableAnalog/Digital PWM Dimming FunctionHigh Power Factor (above 0.98 in normal configuration)Adjustable LED Power w
6、ith an External Current Sense ResistorLow Harmonic Content (THD under 20% in normal configuration)Flexible LED Forward Voltage ConfigurationPower Scalability with Multiple Driver ICsOver-Temperature Protection (OTP)SOP16 EP PackageFL77944应用:LED LightingHigh Power-Analog/PWM dimmingLED LightingLow Po
7、werAnalog/PWM dimmingLED LightingMid Power- Analog/PWM dimmingLighting图1.FL77944简化框图12W评估板FEBFL77944A4High Line 12 W Down Lighting Reference Design for LED Direct AC Driver with Low Flicker Index.This document describes a direct AC line LED driver with a minimal number of external components. The in
8、put voltage range of the LED driver board is classed as high-line application for 198 VAC 242 VAC, with a single DC output, constant current depends on the Rcs value. This document contains a general description of the FL77944, the normal configuration specification, schematic, bill of materials, an
9、d typical operating characteristics.12W评估板FEBFL77944A4测试条件:图2.12W评估板FEBFL77944A4外形和PCB图12W评估板FEBFL77944A4材料清单:图3.12W评估板FEBFL77944A4电路图(1):不带SVF不带SVF的12W评估板FEBFL77944A4电路参数:图4.12W评估板FEBFL77944A4电路图(2):带SVF带SVF的12W评估板FEBFL77944A4材料清单:AO-Electronics 傲壹电子 官网： 中文网：ALPS ADI IR JRC/NJR KEC OTAX Seoul Semiconductor TI Walsin Technology
