FL77905: Analog / PWM / Phase-cut Dimmable Compact LED Direct AC Driver

The FL77905 is a direct AC line LED driver with minimal number of external RC passive components. In normal configuration, one resistor is to adjust LED power, and one capacitor is to provide a stable voltage to an internal biasing shunt regulator.

The FL77905 provides phase-cut dimming with wide dimming range, smooth dimming control and good dimmer compatibility. It achieves high efficiency with high PF and low THD which makes the FL77905 suitable for high-efficiency LED lighting systems. The FL77905 can also be used with a rheostat dimmer switches which are suitable for desktop or indoor lamps.

The FL77905 has a dedicated DIM pin which is designed to be used with analog or digital PWM dimming.Operation of FL77905 admits driving higher-wattage systems, such as street lights and down lights, by simply parallel connecting the driver ICs.

Features

• The simplest Direct AC LED Driver with Only Two External RC Passive Components
• Wide AC Input Range : 90~305 V_AC
• Three Integrated High-Voltage LED Constant Current Sinks of up to 75 mA (RMS) Capability
• TRIAC Dimmable (Leading/Trailing Edge)
• Rheostat Dimmable
• Analog/Digital PWM Dimming Function
• High Power Factor (above 0.98 in normal configuration)
• Adjustable LED Power with an External Current Sense Resistor
• Low Harmonic Content (THD under 20% in Normal Configuration)
• Compact SOIC 8-Lead Package
• Flexible LED Forward Voltage Configuration
• Power Scalability with Multiple Driver ICs
• Over-Temperature Protection (OTP)

Application Notes