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Fairchild Semiconductor Electronic Components Datasheet

FL77905 Datasheet

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

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July 2016
FL77905
Analog / PWM / 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 VAC
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)
Description
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.
Applications
General LED Driving Solution for Residential,
Commercial and Industrial Lighting
Ordering Information
Part Number
Operating
Temperature Range
FL77905MX
-40 to 125°C
Package
8-Lead, Small Outline Integrated Circuit
(SOIC) JEDEC MS012 150” Narrow Body,
Exposed Pad
Packing
Method
2,500 per Reel
© 2016 Fairchild Semiconductor Corporation
FL77905 • Rev. 1.0
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FL77905 Datasheet

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

No Preview Available !

Typical Application
Fuse
Block Diagram
Bridge
Rectifier
CVDD
0.1µF, 50V
To
dimming
signal
2K
VIN
VDD
LED1
DIM
CS
RCS
1%
LED2
LED3
GND
Forward voltage (VF)
across each LED group
is adjustable as desired.
GND
Figure 1.
Typical Application Schematic
VIN
2
VDD 8
Shunt
Regulator
Over-
Temperature
Protection
DIM 1
LED Current
Modulator
LED
Current
Feedback
3 LED1
4 LED2
5 LED3
6
GND
7
CS
Figure 1. Simplified Block Diagram
© 2016 Fairchild Semiconductor Corporation
FL77905 • Rev. 1.0
2
www.fairchildsemi.com


Part Number FL77905
Description Analog / PWM / Phase-cut Dimmable Compact LED Direct AC Driver
Maker Fairchild Semiconductor
Total Page 10 Pages
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