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Fairchild FL7701带PFC的智能LED驱动妄图

宣布时间:2011年10月24日 18:10    宣布者:1640190015
要害词: Fairchild , FL7701 , LED驱动 , PFC , 智能
Fairchild 公司的FL7701是带PFC功效的智能LED灯驱动器,内置高压自偏压电路,数字完成有源PFC功效,带自动重起形式的AOCP功效,内置超温掩护功效,尺度的使命电流0.85mA,可编程振荡器频率和LED电流,主要用在LED装潢照明和低功率LED照明。本文简介了FL7701主要特点,方框图,有和没有电解电容的应用电路图和2.52W参考设计主要特点和目的,电路图和PCB结构图。

FL7701:Smart LED Lamp Driver IC with PFC function

The FL7701 LED lamp driver is a simple IC with PFC function. The special “adopted digital” technique of the IC can automatically detect input voltage condition and send an internal reference signal for achieving high power factor. When AC input is applied to the IC, PFC function is automatically enabled. Otherwise, when DC input is applied to the IC, PFC function is automatically disabled. The FL7701 does not need a bulk capacitor (electrolytic capacitor) for supply rail stability, which can significantly affect to LED lamp system.

FL7701主要特点:

 Digitally Implemented Active PFC Function (No Additional Circuit Necessary for High PF)

 Built-in HV Supplying Circuit: Self Biasing

 AOCP Function with Auto-Restart Mode

 Built-in Over-Temperature Protection Function

 Cycle-by-Cycle Current Limit

 Current-Sense Pin Open Protection

 Low Operating Current: 0.85mA (Typical)

 Under-Voltage Lockout with 5V Hysteresis

 programmable Oscillation Frequency

 programmable LED Current

 Analog Dimming Function

 Soft-Start Function

 precise Internal Reference: ±3%

FL7701应用:

 LED Lamp for Decorative Lighting

 LED Lamp for Low-Power Lighting
20111024113847656.gif
图1。FL7701方框图
20111024113848921.gif
图2。FL7701没有电解电容的应用电路图
20111024113848110.gif
图3。FL7701有电解电容的应用电路图

FL7701参考设计目的:
20111024113848185.gif
FL7701参考设计主要特点:

Digital implemented active PFC function

Built in HV supplying circuit: Self biasing

AOCP function with auto restart mode

Cycle-by-cycle current limit

Current sense pin open protection

Low operating current: 0.85mA (typ.)

programmable Oscillation Frequency

programmable LED Current

Analog Dimming Function
20111024113849141.gif
图4。FL7701参考设计电路图
20111024113850721.gif
图5。FL7701参考设计形状图
20111024113850349.gif
图6。FL7701参考设计PCB结构图
概略请见:
FL7701[1].pdf (1.17 MB, 下载次数: 10)
RD-L030[1].pdf (284.88 KB, 下载次数: 12)
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