© 2012 Fairchild Semiconductor Corporation 2 FEBFL7730_L20L008A • Rev. 0.0.4
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 .......................................................................................................... 17
6.7. Power Factor and THD .................................................................................................. 17
6.8. Operating Temperature .................................................................................................. 18
6.9. EMI................................................................................................................................. 19
7. Revision History ..................................................................................................................... 20
© 2012 Fairchild Semiconductor Corporation 3 FEBFL7730_L20L008A • Rev. 0.0.4
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 90VRMS – 140VRMS 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_L20L008A • Rev. 0.0.4
1.3. Internal Block Diagram
Figure 1. Internal Block Diagram
© 2012 Fairchild Semiconductor Corporation 5 FEBFL7730_L20L008A • Rev. 0.0.4
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 90V Minimum Input Voltage
VIN,MAX 140V Maximum Input Voltage
VIN,NOMINAL 110~120V 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
<±3.9% Line Input Voltage Change:90~140VAC
<±2.1% Output Voltage Change:10~28V
Efficiency
Note : No Dimmer Connected
Eff90VAC 80.7% Efficiency at 90VAC Line Input Voltage
Eff110VAC 82.2% Efficiency at 110VAC Line Input Voltage
Eff120VAC 82.5% Efficiency at 120VAC Line Input Voltage
Eff140VAC 82.9% Efficiency at 140VAC Line Input Voltage
PF/THD
Note : No Dimmer Connected
PF/THD90VAC 0.98/7.4% PF/THD at 90VAC Line Input Voltage
PF/THD110VAC 0.96/9.5% PF/THD at 110VAC Line Input Voltage
PF/THD120VAC 0.95/10.4% PF/THD at 120VAC Line Input Voltage
PF/THD140VAC 0.91/12.4% PF/THD at 140 VAC Line Input Voltage
Temperature
Note : Open-Frame Condition (TA=25ºC)
TFL7730 50ºC FL7730 Temperature
TMOSFET 53ºC Primary MOSFET Temperature
TDIODE 47ºC Secondary Diode Temperature
TTRANSFORMER 52ºC Transformer Temperature
TDAMPER 57ºC Active Damper Temperature
TSTR.RESISTOR 56ºC Startup Resistor Temperature
© 2012 Fairchild Semiconductor Corporation 6 FEBFL7730_L20L008A • Rev. 0.0.4
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_L20L008A • Rev. 0.0.4
4. Printed Circuit Board
Figure 8. Printed PCB, Top Side
Figure 9. Printed PCB, Bottom Side
© 2012 Fairchild Semiconductor Corporation 8 FEBFL7730_L20L008A • Rev. 0.0.4
5. Schematic
Figure 10. Schematic of Evaluation Board
© 2012 Fairchild Semiconductor Corporation 9 FEBFL7730_L20L008A • Rev. 0.0.4
2.1 Bill of Materials
Item
No. Part
Reference 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 FQU5N60C 1 5A/600V Main Switch Fairchild
5 F1 SS-5-1A 1 1A/250V Fuse Bussmann
6 L1, L2 R06472KT00 2 4.7mH Filter Inductor Bosung
7 D1 ES1J 1 1A/600V Diode Fairchild
8 D2 1N5241 1 11V Zener Diode Fairchild
9 D3 1N4003 1 1A/200V Diode Fairchild
10 D4 RS1M 1 1A/1000V Diode Fairchild
11 D5 ES3D 1 3A/200V Fast Rectifier Fairchild
12 C1 MPE 400V334K 14S 1 334/400V Film Capacitor Sungho
13 C2 MPE 400V334K 14S 1 334/400V Film Capacitor Sungho
14 C3 C0805C104K3RACTU 1 104/25V SMD Capacitor 2012 Kemet
15 C4 C1206C335K3PACTU 1 335/25V SMD Capacitor 3216 Kemet
16 C5 C0805C100M3GACTU 1 10/25V SMD Capacitor 2012 Kemet
17 C6 C2012Y5V1E225Z 1 225/25V SMD Capacitor 2012 TDK
18 C7 KMG 47uF/35V 1 47µF/35V Electrolytic Capacitor Samyoung
19 C8 C1206C103KDRACTU 1 103/1kV SMD Capacitor 3216 Kemet
20 C9 SCFz2E472M10BW 1 472/250V Y-Capacitor Samwha
21 C10 KMG 330µF/35V 1 330µF/35V Electrolytic Capacitor Samyoung
22 C11 RM 1000µF/35V 1 1000µF/35V Electrolytic Capacitor Samwha
23 R1 SR03700005600KR500 1 560Ω/0.5W Metal Resistor Vishay
24 R2 RNF12JTD100R 1 100Ω/0.5W Metal Resistor Stackpole Elec.
25 R3 RC1206JR-0720KL 1 20kΩ SMD Resistor 3216 Yageo
26 R4 RC1206JR-071ML 1 1MΩ SMD Resistor 3216 Yageo
27 R5 RC0805JR-0775KL 1 75kΩ SMD Resistor 2012 Yageo
28 R6 RC0805JR-0762KL 1 62kΩ SMD Resistor 2012 Yageo
29 R7 0 1
30 R8 RC0805JR-07150KL 1 150kΩ SMD Resistor 2012 Yageo
31 R9 RC0805JR-0720KL 1 20kΩ SMD Resistor 2012 Yageo
32 R10 RNF12GTD100K 1 100kΩ/0.5W Metal Resistor Stackpole Elec.
33 R11, R12 RC1206JR-07510KL 2 510kΩ SMD Resistor 3216 Yageo
34 R13 RC0805JR-0710RL 1 10Ω SMD Resistor 2012 Yageo
35 R14 RC1206JR-071R2L 1 1.2Ω SMD Resistor 3216 Yageo
36 R15 RC1206FR-071RL 1 1.0Ω SMD Resistor 3216 Yageo
37 R16 RC0805JR-07200RL 1 200Ω SMD Resistor 2012 Yageo
38 R17 RC1206JR-0751KL 1 51kΩ SMD Resistor 3216 Yageo
© 2012 Fairchild Semiconductor Corporation 10 FEBFL7730_L20L008A • Rev. 0.0.4
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 0.13φ 38 Ts Solenoid Winding
2 Insulation: Polyester Tape t = 0.025mm, 2 Layer
3 NS NS- NS+ 0.3φ (TIW) 24 Ts Solenoid Winding
4 Insulation: Polyester Tape t = 0.025mm, 2 Layer
5 NA 2 6 0.13φ 18 Ts Solenoid Winding
6 Insulation: Polyester Tape t = 0.025mm, 2 Layer
7 NP2 3 4 0.13φ 38 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
© 2012 Fairchild Semiconductor Corporation 11 FEBFL7730_L20L008A • Rev. 0.0.4
6. Performance of Evaluation Board
6.1. Startup
Startup time is 0.8s. There is no overshoot at output current and voltage in startup
sequence (refer IOUT and VDD waveform. VDD indicates a reflected output voltage).
Figure 13. Startup – VIN [110VAC], C1 [VIN], C2 [VCS] C3 [VDD], C4,[IOUT], (No Dimmer Connected)
6.2. Operation Waveforms
In steady state, line compensation regulates output current regardless of input voltage
variations. Output current ripple is ±65mA with a rated output current of 380mA.
Figure 14. Op eration Waveforms – VO [22V], IO [380mA], C1 [VCS], C3, [VIN], C4 [IOUT]
VIN = 120VAC VIN = 140VAC
VIN = 90VAC VIN = 110VAC
© 2012 Fairchild Semiconductor Corporation 12 FEBFL7730_L20L008A • Rev. 0.0.4
6.3. Constant Current Regulation
Constant current deviation in the output voltage range from 10V to 28V is less than 2.1% at
each line input voltage. Line regulation at the rated output voltage (22V) is less than 3.9%.
Figure 15. Constant Current Regulation – Measured by E-Load [CR Mode]
Table 4. Constant Current Regula tion by Output Voltage Change (10~28V)
Input Voltage Min. Current Max. Current Tolerance
90VAC / 60Hz 352mA 365mA ±1.8%
110VAC / 60Hz 368mA 384mA ±2.1%
120VAC / 60Hz 374mA 388mA ±1.8%
140VAC / 60Hz 381mA 395mA ±1.8%
Table 5. Constant Current Regula tion by Line Voltage Change (90~140VAC)
Output Voltage 90VAC 110VAC 120VAC 140VAC Tolerance
20V 355mA 372mA 377mA 383mA ±3.8%
22V 360mA 372mA 377mA 386mA ±3.5%
24V 357mA 374mA 383mA 386mA ±3.9%
0
5
10
15
20
25
30
35
0 100 200 300 400 500
90Vac
110Vac
120Vac
140Vac
OVP
VOUT
[V]
Output Current [mA]
© 2012 Fairchild Semiconductor Corporation 13 FEBFL7730_L20L008A • Rev. 0.0.4
6.4. Open/Short-LED Protections
In short-LED condition, the OCP level is reduced from 0.7V to 0.2V because the FL7730
lowers the OCP level when VS voltage is less than 0.4V during output diode conduction
time. The output current in the short-LED condition is less than 1.5A, which doesn’t
damage any external components.
Figure 16. Short-LED Condition – VIN [110VAC], C1 [VCS], C2 [VDD], C3 [VIN], C4 [IOUT]
In open-LED condition, output voltage is limited around 32V by OVP in VDD. The output
over-voltage protection level can be controlled by turn ratio of auxiliary and secondary
windings.
Figure 17. Open-LED Condition – VIN [110VAC], C1 [VCS], C2 [VDD], C3 [VIN]
© 2012 Fairchild Semiconductor Corporation 14 FEBFL7730_L20L008A • Rev. 0.0.4
6.5. Dimming Operation
Dimming operation waveforms are shown in Figure 18 - Figure 20. Active damper, RC
bleeder, and dimming control in FL7730 implement flicker-free dimming operation.
Spike current at dimmer firing is less than 1.2A.
Figure 18. Dimming Operation Waveforms: Max. Dimming Angle, VIN [120VAC], C1 [VIN], C2 [VCS], C4 [IIN]
Figure 19. Dimming Operation Waveforms : 90º Dimming Angle, VIN [120VAC] ,C1 [VIN], C2 [VCS], C4 [IIN]
© 2012 Fairchild Semiconductor Corporation 15 FEBFL7730_L20L008A • Rev. 0.0.4
Figure 20. Dimming Operation Waveforms – Min. Dimming Angle, VIN [120VAC], C1 [VIN], C2 [VCS], C4
[IIN]
Output current is controlled by dimming function when rotating dimmer switch as in the
dimming curve in Figure 21. The dimming control block in FL7730 smoothly changes
regulated output current by detecting dimming angle.
Figure 21. Dimmin g Curve (Effective RMS Input Voltage vs. Output Current) – Line Voltage [120VAC]
© 2012 Fairchild Semiconductor Corporation 16 FEBFL7730_L20L008A • Rev. 0.0.4
Table 6. TRIAC Dimmer Compatibility
Manufacturer Dimmer Condition
Maximum
Current Minimum
Current Flicker
LUTRON S-600P-WH 120V / 60Hz 330mA 40mA (12.0%) No
LUTRON CN-600P-WH 120V / 60Hz 328mA 11mA (3.4%) No
LUTRON GL-600H 120V / 60Hz 365mA 8mA (2.2%) No
LUTRON TG-603PGH-WH 120V / 60Hz 252mA 12mA (4.8%) No
LUTRON TG-600PH-WH 120V / 60Hz 333mA 14mA (4.2%) No
LUTRON LG-600P 120V / 60Hz 327mA 3mA (0.9%) No
LUTRON CTCL-153PD 120V / 60Hz 320mA 58mA (18.0%) No
LEVITON IP106 120V / 60Hz 380mA 36mA (9.5%) No
LEVITON 1C4005 120V / 60Hz 344mA 0mA (0%) No
LEVITON 6631-LW 120V / 60Hz 340mA 0mA (0%) No
Legrand F 165H 120V / 60Hz 344mA 3mA (0.9%) No
© 2012 Fairchild Semiconductor Corporation 17 FEBFL7730_L20L008A • Rev. 0.0.4
6.6. System Efficiency
Power efficiency is 80.7 ~ 82.9% in 90 ~ 140VAC input voltage range.
Figure 22. Power Efficiency (Input Voltage vs. Efficiency)
Table 7. System Efficiency
Input
Voltage Input Power Output
Current Output
Voltage Output
Power Efficiency
90VAC 9.68W 360mA 21.70V 7.81W 80.7%
110VAC 9.96W 376mA 21.77V 8.19W 82.2%
120VAC 10.02W 380mA 21.77V 8.27W 82.5%
140VAC 10.15W 386mA 21.79V 8.41W 82.9%
6.7. Power Factor and THD
FL7730 shows excellent power factor and THD performance. Power factor is very high
with enough margins from 0.9. THD is much less than 30% specification.
Table 8. Power Factor and THD
Input Voltage Output Current Output Voltage PF THD
90VAC 360mA 21.70V 0.98 7.4%
110VAC 376mA 21.77V 0.96 9.5%
120VAC 380mA 21.77V 0.95 10.4%
140VAC 386mA 21.79V 0.91 12.4%
70
72
74
76
78
80
82
84
86
88
90
90Vac 110Vac 120Vac 140Vac
Input Voltage [V]
Eff.
[%]
© 2012 Fairchild Semiconductor Corporation 18 FEBFL7730_L20L008A • Rev. 0.0.4
6.8. Operating Temperature
Temperature of the all components on this board is less than 60ºC.
Figure 23. Board Temperature - Top View, VIN [120VAC], IO [380mA]
Figure 24. Board Temperature - Bo ttom View, VIN [120VAC], IO [380mA]
© 2012 Fairchild Semiconductor Corporation 19 FEBFL7730_L20L008A • Rev. 0.0.4
6.9. EMI
The all measurement was conducted in observance of CISPR22 criteria.
Figure 25. EMI Resu lts – VIN [110V], VOUT [22V], IOUT [380mA]
© 2012 Fairchild Semiconductor Corporation 20 FEBFL7730_L20L008A • Rev. 0.0.4
7. Revision History
Rev. Date Description
0.0.1 FEB 23, 2012 Change User Guide number from FEB-L020-1 to FEBFL7730_L20L008A
0.0.2 FEB 24, 2012 Initial edit/format pass
0.0.3 FEB 28,2012 Initial edit (Part list, figure number)
0.0.4 MAR 8, 2012 BOM revision and minor error correction
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