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Fairchild Semiconductor - Single-Stage Primary-Side-Regulation PWM Controller

Numéro de référence FL7734
Description Single-Stage Primary-Side-Regulation PWM Controller
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FL7734 fiche technique
November 2014
FL7734
Single-Stage Primary-Side-Regulation PWM Controller
for PFC and Phase Cut Dimmable LED Driving
Features
Excellent Dimmer Compatibility by Active Dimming
Control
Programmable Dimming Curve and Input Current
Management
Constant LED Current Regulation in Large Phase
Angle Range
Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
Accurate Constant-Current (CC) Control,
Independent on Line Voltage, Output Voltage,
Magnetizing Inductance Variation
Power Factor Correction (PFC)
Fast Startup utilizing Bleeding Circuit
Open-LED Protection
Short-LED Protection
Sensing Resistor Short Protection
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Applications
LED Lighting System
Description
The FL7734 is a highly integrated PWM controller with
advanced Primary-Side-Regulation (PSR) technique to
minimize components for low power LED lighting
solutions. Using the innovative TRUECURRENT®
technology for tight constant-current control, it enables
designs with constant-current (CC) tolerance of less
than ±1% in the wide line voltage range to meet
stringent LED brightness requirements.
FL7734 can operate with all types of phase cut
dimmers. Phase cut dimming is managed smoothly by
Fairchilds proprietary constant input current control and
bleeding current control to achieve excellent dimmer
compatibility without visible flicker.
The controller can automatically detect whether there is
a dimmer connection. In non dimming mode, the
operating mode is set to optimize power factor and THD
by enabling linear frequency control and voltage mode
based on DCM.
An external high-voltage bleeding circuit is utilized to
implement fast startup and high system efficiency. The
FL7734 also provides powerful protections, such as
LED open / short, sensing resistor shorted, and over-
temperature for high system reliability. The FL7734 is
available in 16-pin Small-Outline Package (SOP).
Related Resources
FL7734 Product Folder
Ordering Information
Part Number Operating Temperature Range
Package
FL7734MX
-40°C to +125°C
16-Lead, Small Outline Package (SOP-16)
Packing
Method
Tape & Reel
© 2014 Fairchild Semiconductor Corporation
FL7734 • Rev. 1.0
www.fairchildsemi.com

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