FL7734

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  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 Fairchild’s proprietary constant input current control and bleeding current control to achieve excellent dimmer co...