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主要特性：
? 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
图1。FL7701方框图
图2。FL7701没有电解电容的应用电路图
图3。FL7701有电解电容的应用电路图
FL7701参考设计指标：
FL7701参考设计主要特性：
??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
图4。FL7701参考设计电路图
图5。FL7701参考设计外形图
图6。FL7701参考设计PCB布局图
详情请见：
http://www.fairchildsemi.com/ds/FL/FL7701.pdf
和
http://www.fairchildsemi.com/support/referencedesign/docs/RD-L030.pdf
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