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FL77904 — Phase-cut Dimmable Compact LED Direct AC Driver
July 2016
FL77904
Phase-cut Dimmable Compact LED Direct AC Driver
Features
The simplest Direct AC LED Driver with Only Two
External RC Passive Components
Wide AC Input Range: 90~305 V
AC
Four Integrated High-Voltage LED Constant
Current Sinks of up to 75 mA RMS Input Current
Capability
High Power Factor (above 0.98 in normal
configuration) Low Harmonic Content (THD under
20% in normal configuration)
Low Flicker Index by Self Valley Fill with No
Degradation of PF and THD
Adjustable LED Power with an External Current
Sense Resistor
TRIAC Dimmable (Leading/Trailing Edge)
Rheostat Dimmable Flexible LED Forward Voltage
Configuration
Power Scalability with Multiple Driver ICs
Over-Temperature Protection (OTP)
Compact SOIC 8-Lead Package
Description
The FL77904 is a direct AC line LED driver with a
minimal number of external RC passive components. In
normal configuration, one resistor adjusts LED current
for desired system luminance and another bypass
capacitor provides a stable voltage to an internal biasing
shunt regulator.
The FL77904 provides phase-cut dimming with wide
dimming range, smooth dimming control and good
dimmer compatibility. Optimized levels of each LED
strings’ current regulation achieve over 0.98 high PF
and less than 20% low THD which makes the FL77904
suitable for high-efficiency LED lighting systems. The
FL77904 can be also used with a simple rheostat
dimmer switches which are suitable for desktop or
indoor lamps.
Flicker index is significantly improved by using
proprietary self valley fill technique without degrading
PF and THD. The cost effective solution brings low line
ripple light quality with system compactness.
Operation of FL77904 admits driving higher-wattage
systems, such as street lights and down lights, by
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