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January 2012
?2010 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FL6961 " Rev. 1.0.2
 
FL6961
Single-Stage Flyback and Boundary Mode PFC
Controller for Lighting
 
Features
?   Boundary Mode PFC Controller  
?   Low Input Current THD  
?   Controlled On-Time PWM  
?   Zero-Current Detection 
?   Cycle-by-Cycle Current Limiting  
?   Leading-Edge Blanking Instead of RC Filtering 
?   Low Startup Current: 10?/SPAN>A Typical  
?   Low Operating Current: 4.5mA Typical 
?   Feedback Open-Loop Protection 
?   Programmable Maximum On-Time (MOT) 
?   Output Over-Voltage Clamping Protection 
?   Clamped Gate Output Voltage: 16.5V 
Applications
?   General LED Lighting 
?   Industrial, Commercial and Residential Fixtures 
?   Outdoor Lighting: Street, Roadway, Parking, 
Construction, and Ornamental LED Lighting
Description
The FL6961 is a general lighting power controller for
low- to high-power lumens applications requiring power
factor correction. It is designed for flyback or boost
converter operating in Boundary Mode.
The FL6961 provides a controlled on-time to regulate
the output DC voltage and achieves natural power factor
correction (PFC). The maximum on-time of the external
switch is programmable to ensure safe operation during
AC brownouts. An innovative multi-vector error amplifier
provides rapid transient response and precise output
voltage clamping. A built-in circuit disables the controller
if the output feedback loop is opened. The startup
current is lower than 20礎 and the operating current is
less than 6mA. The supply voltage can be up to 25V,
maximizing application flexibility.
 
Ordering Information
Part Number
Operating Temperature
Range
Package
Packing Method
FL6961MY
-40癈 to +125癈
8-Pin, Small Outline Package (SOP)
Tape & Reel
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