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This literature is subject to all applicable copyright laws and is not for resale in any manner.FL77944 Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver July 2016 FL77944 Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver Description Features The FL77944 is a direct AC line LED driver with a The simplest Direct AC LED Driver with Only Two minimal number of external RC passive components. In External RC Passive Component normal configuration, one resistor is to adjust LED Wide AC Input Range: 90~305 V AC power, and one capacitor is to provide a stable voltage to an internal biasing shunt regulator. Four Integrated High-Voltage LED Constant Current Sinks of up to 150 mA (RMS) Capability The FL77944 provides phase-cut dimming with wide dimming range, smooth dimming control and good TRIAC Dimmable (Leading/Trailing Edge) dimmer compatibility. It achieves high efficiency with Rheostat Dimmable high PF and low THD, which makes the FL77944 Analog/Digital PWM Dimming Function suitable for high-efficiency LED lighting systems. The FL77944 has a dedicated DIM pin which can be used High Power Factor (above 0.98 typically) with analog or digital PWM dimming. The FL77944 can Adjustable LED Power with an External Current also be used with a rheostat dimmer switch which is Sense Resistor suitable for desktop or indoor lamps. Low Harmonic Content (THD under 20% typically) Operation of FL77944 admits driving higher-wattage systems, such as street lights and down lights, by SOIC-16 EP Package simply parallel connecting the driver ICs. Flexible LED Forward Voltage Configuration Power Scalability with Multiple Driver ICs Over-Temperature Protection (OTP) Applications General LED Driving Solution for Residential, Commercial and Industrial Lighting Ordering Information Operating Packing Part Number Package Temperature Range Method 16-Lead, Small Outline Integrated Circuit FL77944MX -40 to 125C 2,500 per Reel (SOIC) Exposed Dap 150 Narrow Body 2016 Fairchild Semiconductor Corporation www.fairchildsemi.com FL77944 Rev. 1.2