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This literature is subject to all applicable copyright laws and is not for resale in any manner.FL7734 Single-Stage Primary-Side-Regulation PWM Controller for PFC and Phase Cut Dimmable LED Driving November 2014 FL7734 Single-Stage Primary-Side-Regulation PWM Controller for PFC and Phase Cut Dimmable LED Driving Features Description Excellent Dimmer Compatibility by Active Dimming The FL7734 is a highly integrated PWM controller with Control advanced Primary-Side-Regulation (PSR) technique to minimize components for low power LED lighting Programmable Dimming Curve and Input Current solutions. Using the innovative TRUECURRENT Management technology for tight constant-current control, it enables Constant LED Current Regulation in Large Phase designs with constant-current (CC) tolerance of less Angle Range than 1% in the wide line voltage range to meet stringent LED brightness requirements. Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry FL7734 can operate with all types of phase cut dimmers. Phase cut dimming is managed smoothly by Accurate Constant-Current (CC) Control, Fairchilds proprietary constant input current control and Independent on Line Voltage, Output Voltage, bleeding current control to achieve excellent dimmer Magnetizing Inductance Variation compatibility without visible flicker. Power Factor Correction (PFC) The controller can automatically detect whether there is Fast Startup utilizing Bleeding Circuit a dimmer connection. In non dimming mode, the operating mode is set to optimize power factor and THD Open-LED Protection by enabling linear frequency control and voltage mode Short-LED Protection based on DCM. Sensing Resistor Short Protection An external high-voltage bleeding circuit is utilized to implement fast startup and high system efficiency. The Cycle-by-Cycle Current Limiting FL7734 also provides powerful protections, such as Over-Temperature Protection with Auto Restart LED open / short, sensing resistor shorted, and over- temperature for high system reliability. The FL7734 is available in 16-pin Small-Outline Package (SOP). Applications LED Lighting System Related Resources FL7734 Product Folder Ordering Information Packing Part Number Operating Temperature Range Package Method FL7734MX -40C to +125C 16-Lead, Small Outline Package (SOP-16) Tape & Reel 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FL7734 Rev. 1.0