Fairchild FEBFL77944_L80L012A, FEBFL77944_L80L012B User Manual
User Guide for
FEBFL77944_L80L012A
FEBFL77944_L80L012B
Evaluation Board
12 W Down Light AC LED Driver at Low-Line
Featured Fairchild Product:
FL77944
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com
© 2016 Fairchild Semiconductor Corporation 1 FEBFL77944_L80L012A_B • Rev. 1.0
Table of Contents
1. Introduction ............................................................................................................................... 3
1.1. General Description of FL77944MX ............................................................................... 3
1.2. Controller Features........................................................................................................... 3
1.3. Controller Internal Block Diagram .................................................................................. 4
2. Evaluation Board Test Outline.................................................................................................. 5
3. Evaluation Board Specifications ............................................................................................... 6
4. Evaluation Board Operating Temperature ................................................................................ 7
5. Evaluation Board Bill of Materials (BOM) .............................................................................. 8
6. Low-Line without SVF Evaluation Board ................................................................................ 9
6.1. Evaluation Board Schematic ............................................................................................ 9
6.2. Key Performance Measurements ................................................................................... 10
6.3. Startup ............................................................................................................................ 11
6.4. Normal Operation .......................................................................................................... 12
6.5. Dimming Operation & Performance .............................................................................. 13
6.6. Electromagnetic Interference (EMI) .............................................................................. 14
7. Low-Line with SVF Evaluation Board ................................................................................... 15
7.1. Evaluation Board Schematic .......................................................................................... 15
7.2. Key Performance Measurements ................................................................................... 16
7.3. Dimming Performance ................................................................................................... 17
7.4. Electromagnetic Interference (EMI) .............................................................................. 17
8. Revision History ..................................................................................................................... 18
© 2016 Fairchild Semiconductor Corporation 2 FEBFL77944_L80L012A_B • Rev. 1.0
This user guide supports the evaluation kit for the FL77944. It should be used in
conjunction with the FL77944 datasheet as well as Fairchild’s application notes and
technical support team. Please visit Fairchild’s website at www.fairchildsemi.com.
1. Introduction
This document describes a direct AC line LED driver with a minimal number of external
components. The input voltage range of the LED driver board are classed as low-line
application for 98 VAC ~ 142 V
the Rcs value. This document contains a general description of the FL77944, the normal
configuration specification, schematic, bill of materials, and typical operating
characteristics.
1.1. General Description of FL77944MX
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 the 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.
with a single DC output, constant current depends on
AC,
High wattage design of the FL77904 can be implemented with multiple IC embedded in
parallel for street lighting and down lighting applications.
1.2. Controller Features
The simplest Direct AC LED Driver with Only Two External RC Passive
Component
Wide AC Input Range : 90~305 V
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 in normal configuration)
Adjustable LED Power with an External Current Sense Resistor
Low Harmonic Content (THD under 20% in normal configuration)
SOP16 EP Package
Flexible LED Forward Voltage Configuration
Power Scalability with Multiple Driver ICs
Over-Temperature Protection (OTP)
AC
© 2016 Fairchild Semiconductor Corporation 3 FEBFL77944_L80L012A_B • Rev. 1.0
VIN
LED1
LED2
LED3
LED4
3
5
7
12
10
Shunt
Regulator
LED Current
Modulator
15
VDD
9
GND CS
1
14
11
DIM
MODE
GND
16
LED
Current
Feedback
Over-
Temperature
Protection
1.3. Controller Internal Block Diagram
Figure 1. Simplified FL77944 Block Diagram
© 2016 Fairchild Semiconductor Corporation 4 FEBFL77944_L80L012A_B • Rev. 1.0
Evaluation Board #
FEBFL77944_L80L012A
Low-Line, 12 W, without SVF
FEBFL77944_L80L012B
Low-Line, 12 W, with SVF
Test Date
APRIL 2016
Test Equipment
AC Source: 6800 Series
Oscilloscope: LeCroy 104Xi-A
Power Meter: Yokogawa PZ4000
Multimeter: FLUKE 87 V
OL770: LED Test and Measurement System for Efficacy
Photo Sensor: Hamamatsu for Flicker Index
Test Items
1. Startup Performance
2. Normal Operation
3. Efficacy
4. Flicker Index
5. Power Factor
6. Total Harmonic Distortion(THD)
7. Dimming Performance
8. Conduction EMI
2. Evaluation Board Test Outline
Table 1. Evaluation Board Test Condition & Equipment List
© 2016 Fairchild Semiconductor Corporation 5 FEBFL77944_L80L012A_B • Rev. 1.0
Version A
Version B
SVF Cap.
For Normal Electrolytic Capacitors
For SMD Electrolytic Capacitors
EVB
PHOTO
PCB
Diameter
100 mm
Material
Metal
Thickness
1.6 t
Input
Low-Line: 108 ~ 132 VAC
3. Evaluation Board Specifications
Table 2. Evaluation Board Specifications
© 2016 Fairchild Semiconductor Corporation 6 FEBFL77944_L80L012A_B • Rev. 1.0
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