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Fairchild Semiconductor Electronic Components Datasheet

FL77944 Datasheet

Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver

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July 2016
FL77944
Analog/PWM/Phase-cut Dimmable High Power LED
Direct AC Driver
Features
The simplest Direct AC LED Driver with Only Two
External RC Passive Component
Wide AC Input Range: 90~305 VAC
Four Integrated High-Voltage LED Constant
Current Sinks of up to 150 mA (RMS) Capability
TRIAC Dimmable (Leading/Trailing Edge)
Rheostat Dimmable
Analog/Digital PWM Dimming Function
High Power Factor (above 0.98 typically)
Adjustable LED Power with an External Current
Sense Resistor
Low Harmonic Content (THD under 20% typically)
SOIC-16 EP Package
Flexible LED Forward Voltage Configuration
Power Scalability with Multiple Driver ICs
Over-Temperature Protection (OTP)
Description
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.
Applications
General LED Driving Solution for Residential,
Commercial and Industrial Lighting
Ordering Information
Part Number
FL77944MX
Operating
Temperature Range
-40 to 125°C
Package
16-Lead, Small Outline Integrated Circuit
(SOIC) Exposed Dap 150” Narrow Body
Packing
Method
2,500 per Reel
© 2016 Fairchild Semiconductor Corporation
FL77944 • Rev. 1.2
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FL77944 Datasheet

Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver

No Preview Available !

Typical Applications
Fuse
120 VAC
Down-light 12W LED Driver using
1.3W high VF LEDs
Bridge
Rectifier
CVDD
0.1uF, 50V
2K
VDD
VIN
LED1
LED2
MODE
LED3
LED4
CS GND DIM
GND
Figure 1.
RCS
1%
VF=35V@42mA LEDs(Each groups VF
can be flexible as long as total series VF
Is 130~140V)
12 W at 120 VAC LED Down-Light Application
Fuse
220 VAC
4ft tube-type 22W LED Driver using
288x0.06W LEDs
2K
Bridge
Rectifier
CVDD
0.1uF, 50V
VIN
VDD
LED1
LED2
MODE
LED3
LED4
CS GND DIM
RCS
1% Total 288 LEDs
GND
Figure 2.
22 W at 220 VAC LED Tube-Type Application
0.06W 18X5
0.06W 18X4
0.06W 18X4
0.06W 18X3
© 2016 Fairchild Semiconductor Corporation
FL77944• Rev. 1.2
2
www.fairchildsemi.com


Part Number FL77944
Description Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver
Maker Fairchild Semiconductor
Total Page 11 Pages
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