The FL77944 is a direct AC line LED driver with a 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 FL77944 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 FL77944 suitable for high-efficiency LED lighting systems. The FL77944 has a dedicated DIM pin which can be used with analog or digital PWM dimming. The FL77944 can also be used with a rheostat dimmer switch which is suitable for desktop or indoor lamps.
Operation of FL77944 admits driving higher-wattage systems, such as street lights and down lights, by simply parallel connecting the driver ICs.
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Features |
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The simplest Direct AC LED Driver with Only Two External RC Passive Component
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Wide AC Input Range: 90~305 VAC
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Four Integrated High-Voltage LED Constant Current Sinks of up to 150 mA (RMS) Capability
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TRIAC Dimmable (Leading/Trailing Edge)
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Analog/Digital PWM Dimming Function
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High Power Factor (above 0.98 in normal configuration)
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Adjustable LED Power with an External Current Sense Resistor
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Low Harmonic Content (THD under 20% in normal configuration)
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Flexible LED Forward Voltage Configuration
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Power Scalability with Multiple Driver ICs
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Over-Temperature Protection (OTP)
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Applications |
- Lighting
- LED Lighting – High Power- Analog/PWM dimming
- LED Lighting – Low Power – Analog/PWM dimming
- LED Lighting – Mid Power- Analog/PWM dimming
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