Fairchild FEBFL7730_L20H008A User manual

© 2012 Fairchild Semiconductor Corporation 1 FEBFL7730_L20H008A • Rev. 0.0.2
User Guide for
FEBFL7730_L20H008A
8.4W LED Bulb Using FL7730
Featured Fairchild Product:
FL7730
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com

© 2012 Fairchild Semiconductor Corporation 2 FEBFL7730_L20H008A • Rev. 0.0.2
Table of Contents
1. Introduction............................................................................................................................... 3
1.1. General Description.......................................................................................................... 3
1.2. Features ............................................................................................................................ 3
1.3. Internal Block Diagram.................................................................................................... 4
2. General Specifications .............................................................................................................. 5
3. Photographs............................................................................................................................... 6
4. Printed Circuit Board ................................................................................................................ 7
5. Schematic.................................................................................................................................. 8
2.1 Bill of Materials ............................................................................................................... 9
2.2 Transformer and Winding Specifications ...................................................................... 10
6. Performance of Evaluation Board........................................................................................... 11
6.1. Startup ............................................................................................................................ 11
6.2. Operation Waveforms .................................................................................................... 11
6.3. Constant Current Regulation.......................................................................................... 12
6.4. Open/Short-LED Protections ......................................................................................... 13
6.5. Dimming Operation........................................................................................................ 14
6.6. System Efficiency .......................................................................................................... 16
6.7. Power Factor and THD .................................................................................................. 16
6.8. Operating Temperature .................................................................................................. 17
6.9. EMI................................................................................................................................. 18
7. Revision History ..................................................................................................................... 19

© 2012 Fairchild Semiconductor Corporation 3 FEBFL7730_L20H008A • Rev. 0.0.2
This user guide supports the evaluation kit for the FL7730. It should be used in
conjunction with the FL7730 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 the proposed solution for low-line voltage LED ballast using the
FL7730 PSR single-stage controller. The input voltage range is 180VRMS – 265VRMS and
there is one DC output with a constant current of 380mA at 22VMAX. This document
contains general description of FL7730, the power supply specification, schematic, bill of
materials, and the typical operating characteristics.
1.1. General Description
The FL7730 is an active Power Factor Correction (PFC) controller using single-stage
flyback topology. Dimming control with no flicker is implemented by an analog sensing
method. Primary-side regulation and single-stage topology reduce external components
such as input bulk capacitor and feedback circuitry and minimize cost. To improve good
power factor and Total Harmonic Distortion (THD), constant on-time control is utilized
with internal error amplifier and a low-bandwidth compensator. Precise constant-current
control regulates accurate output current, independent of input voltage and output
voltage. Operating frequency is proportionally changed by output voltage to guarantee
DCM operation with higher efficiency. FL7730 provides protections such as open-LED,
short-LED, and over-temperature protection.
1.2. Features
Compatible with Traditional TRIAC Control
Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry
Power Factor Correction (PFC)
Accurate Constant-Current (CC) Control
Line Voltage Compensation for CC Control
Linear Frequency Control for Better Efficiency and Simpler Design
Open-LED Protection
Short-LED Protection
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Low Startup Current: 20μA
Low Operating Current: 5mA
Frequency Hopping for EMI
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 18V
SOP-8 Package Available

© 2012 Fairchild Semiconductor Corporation 4 FEBFL7730_L20H008A • Rev. 0.0.2
1.3. Internal Block Diagram
Figure 1. Internal Block Diagram

© 2012 Fairchild Semiconductor Corporation 5 FEBFL7730_L20H008A • Rev. 0.0.2
2. General Specifications
All data in Table 1 was measured at an ambient temperature of 25°C.
Table 1. Summary of Features and Performance for LED Lighting Bulb
Description Symbol Value Comments
Input Voltage
VIN,MIN 180V Minimum Input Voltage
VIN,MAX 265V Maximum Input Voltage
VIN,NOMINAL 220~230V Nominal Input Voltage
Input Frequency fIN 60Hz Line Frequency
Output Voltage
Current
VOUT,MIN 10V Minimum Output Voltage
VOUT,MAX 28V Maximum Output Voltage
VOUT,NOMINAL 22V Nominal Output Voltage
IOUT,NOMINAL 380mA Nominal Output Current
IOUT,RIPPLE ±65mA Output Current Ripple
CC Deviation <±1.9% Line Input Voltage Change: 180~265VAC
<±3.1% Output Voltage Change: 10~28V
Efficiency
Note: No Dimmer Connected
Eff180VAC 84.5% Efficiency at 180VAC Line Input Voltage
Eff220VAC 84.4% Efficiency at 220VAC Line Input Voltage
Eff230VAC 84.4% Efficiency at 230VAC Line Input Voltage
Eff265VAC 83.8% Efficiency at 265VAC Line Input Voltage
PF/THD
Note: No Dimmer Connected
PF/THD180VAC 0.97/13.7% PF/THD at 180VAC Line Input Voltage
PF/THD220VAC 0.93/16.6% PF/THD at 220VAC Line Input Voltage
PF/THD230VAC 0.92/17.3% PF/THD at 230VAC Line Input Voltage
PF/THD265VAC 0.87/19.7% PF/THD at 265VAC Line Input Voltage
Temperature
Note: Open-Frame Condition (TA=25ºC)
TFL7730 46ºC FL7730 Temperature
TMOSFET 53ºC Primary MOSFET Temperature
TDIODE 45ºC Secondary Diode Temperature
TTRANSFORMER 48ºC Transformer Temperature
TDAMPER 49ºC Active Damper Temperature
TSTR.RESISTOR 55ºC Startup Resistor Temperature

© 2012 Fairchild Semiconductor Corporation 6 FEBFL7730_L20H008A • Rev. 0.0.2
3. Photographs
Figure 2. Top View of Evaluation Board Figure 3. Bottom View of Evaluation Board
Dimensions: 62.5mm (L) 26.8mm (W) 12.0 (H)
Figure 4. Side View in Bulb Case Type 1 Figure 5. Bottom View in Bulb Case Type 1
Bulb Case Type 1 : 32mm (Case Diameter) 40mm (Case Depth)
Figure 6. Side View in Bulb Case Type 2 Figure 7. Bottom View in Bulb Case Type 2
Bulb Case Type 2 : 34mm (Case Diameter) 44mm (Case Depth)

© 2012 Fairchild Semiconductor Corporation 7 FEBFL7730_L20H008A • Rev. 0.0.2
4. Printed Circuit Board
26.8
16.1 19.0
Figure 8. Printed PCB, Top Side
Figure 9. Printed PCB, Bottom Side

© 2012 Fairchild Semiconductor Corporation 8 FEBFL7730_L20H008A • Rev. 0.0.2
5. Schematic
N1 N3
R12
510k
C8
10n
D4
RS1M
D5
ES3D
C10
35V/330uF
1
N2
VO
CS
GATE
VDD
Dim
COMI GND
GND
VS
7
8
3
6
2 4
5
R8
150k
R9
20k
R13
10Ω
R14
1.2Ω
D3
1N4003
C5
10p C9
4.7nF
C4 1u
L1
10mH
R15
1.0Ω
C6
2.2u
R17
51k
D211V
R5
510k
R6 200k
R4
1M
Q1
MB8S
R1
1k/0.5W
C1
100n
C2
100n
Q3 FL7730
Q4
FQU2N60C
R10
250kΩ
0.5W
L2
4.7mH
C7
47u
F1
1A/250V
R11
510k
R2
300/0.5W
D1
ES1J
R3
43k
C3
100nF
Q2
FQN1N50C
R16
0
R7
0
C11
35V/1000uF
Figure 10. Schematic of Evaluation Board

© 2012 Fairchild Semiconductor Corporation 9 FEBFL7730_L20H008A • Rev. 0.0.2
2.1 Bill of Materials
No. Part Part number Qty Description Manufacturer
1 Q1 MB8S 1 Bridge Diode Fairchild
2 Q2 FQN1N50C 1 1A/500V Active Damper MOSFET Fairchild
3 Q3 FL7730 1 Main Controller Fairchild
4 Q4 FQU2N60C 1 5A/600V Main Switch Fairchild
5 F1 SS-5-1A 1 1A/250V Fuse Bussmann
6 L1 R06103KT00 1 10mH Filter Inductor Bosung
7 L2 R06472KT00 1 4.7mH Filter Inductor Bosung
8 D1 ES1J 1 1A/600V Diode Fairchild
9 D2 1N5241 1 11V Zener Diode Fairchild
10 D3 1N4003 1 1A/200V Diode Fairchild
11 D4 RS1M 1 1A/1000V Diode Fairchild
12 D5 ES3D 1 3A/200V Fast Rectifier Fairchild
13 C1 MPE 400V104K 14S 1 104/400V Film Capacitor Sungho
14 C2 MPE 400V104K 14S 1 104/400V Film Capacitor Sungho
15 C3 C0805C104K3RACTU 1 104/25V SMD Capacitor 2012 Kemet
16 C4 C1206C105K3PACTU 1 105/25V SMD Capacitor 3216 Kemet
17 C5 C0805C100M3GACTU 1 10/25V SMD Capacitor 2012 Kemet
18 C6 C2012Y5V1E225Z 1 225/25V SMD Capacitor 2012 TDK
19 C7 KMG 47µF/35V 1 47µF/35V Electrolytic Capacitor Samyoung
20 C8 C1206C103KDRACTU 1 103/1kV SMD Capacitor 3216 Kemet
21 C9 SCFz2E472M10BW 1 472/250V Y-Capacitor Samwha
22 C10 KMG 330µF/35V 1 330µF/35V Electrolytic Capacitor Samyoung
23 C11 RM 1000µF/35V 1 1000µF/35V Electrolytic Capacitor Samwha
24 R1 SFR2500001001FR500 1 1kΩ/0.5W Metal Resistor Vishay
25 R2 RNF12JTD300R 1 300Ω/0.5W Metal Resistor Stackpole Elec.
26 R3 RC1206JR-0720KL 1 20kΩ SMD Resistor 3216 Yageo
27 R4 RC1206JR-071ML 1 1MΩ SMD Resistor 3216 Yageo
28 R5 RC0805JR-07510KL 1 510kΩ SMD Resistor 2012 Yageo
29 R6 RC0805JR-07200KL 1 200kΩ SMD Resistor 2012 Yageo
30 R7 0 1
31 R8 RC0805JR-07150KL 1 150kΩ SMD Resistor 2012 Yageo
32 R9 RC0805JR-0720KL 1 20kΩ SMD Resistor 2012 Yageo
33 R10 RNF12GTD250K 1 250kΩ/0.5W Metal Resistor Stackpole Elec.
34 R11, R12 RC1206JR-07510KL 2 510kΩ SMD Resistor 3216 Yageo
35 R13 RC0805JR-0710RL 1 10Ω SMD Resistor 2012 Yageo
36 R14 RC1206JR-071R2L 1 1.2Ω SMD Resistor 3216 Yageo
37 R15 RC1206FR-071RL 1 1.0Ω SMD Resistor 3216 Yageo
38 R16 RC0805JR-070RL 1 0Ω SMD Resistor 2012 Yageo
39 R17 RC1206JR-0751KL 1 51kΩ SMD Resistor 3216 Yageo

© 2012 Fairchild Semiconductor Corporation 10 FEBFL7730_L20H008A • Rev. 0.0.2
2.2 Transformer and Winding Specifications
Figure 11. Transformer Specifications & Construction
Figure 12. Transformer Winding Structure
Table 2. Winding Specifications
No. Winding Pin (S F) Wire Turns Winding Method
1 NP1 5 3 0.13φ38 Ts Solenoid Winding
2 Insulation: Polyester Tape t = 0.025mm, 2 Layer
3 NSNS- NS+ 0.3φ(TIW) 24 Ts Solenoid Winding
4 Insulation: Polyester Tape t = 0.025mm, 2 Layer
5 NA2 6 0.13φ18 Ts Solenoid Winding
6 Insulation: Polyester Tape t = 0.025mm, 2 Layer
7 NP2 3 4 0.13φ38 Ts Solenoid Winding
8 Insulation : Polyester Tape t = 0.025mm, 6 Layer
Table 3. Electrical Characteristics
Pin Specification Remark
Inductance 1– 2 1mH ±10% 50kHz, 1V
Leakage 1– 2 8µH 50kHz, 1V Short All Output Pins