Fairchild FEBFL7701 2.4w led ballast using fl7701 Datasheet

User Guide for
FEBFL7701_L30U003A
2.4W LED Ballast Using FL7701
Featured Fairchild Product:
FL7701
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev.1.0.2
Table of Contents
1. Introduction ............................................................................................................................... 3
1.1.
1.2.
1.3.
General Description.......................................................................................................... 3
Key Features ..................................................................................................................... 3
Internal Block Diagram .................................................................................................... 4
2. General Specifications for Evaluation Board ........................................................................... 5
3. Photographs of the Evaluation Board ....................................................................................... 6
4. Printed Circuit Board ................................................................................................................ 7
5. Schematic .................................................................................................................................. 8
6. Bill of Materials ........................................................................................................................ 9
7. Test Condition & Test Equipment ............................................................................................ 9
8. Test Waveforms ...................................................................................................................... 10
8.1.
8.2.
8.3.
8.4.
8.5.
Typical Waveforms: Startup .......................................................................................... 10
Operating frequency & minimum duty .......................................................................... 11
Typical waveforms: Steady State ................................................................................... 12
Typical waveforms: Abnormal Mode(LED Open) ........................................................ 15
Typical waveforms: Abnormal Mode (Inductor Short Condition) ................................ 16
9. Performance of Evaluation Board ........................................................................................... 17
9.1.
9.2.
9.3.
9.4.
9.5.
Power Factor at Rated Load Condition .......................................................................... 17
System Efficiency .......................................................................................................... 18
THD Performance .......................................................................................................... 19
Thermal Performance ..................................................................................................... 20
EMI Results .................................................................................................................... 22
10. Revision History ..................................................................................................................... 24
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
This user guide supports the Evaluation kit for the FL7701. It should be used in
conjunction with the FL7701 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 a universal-input 2.4W LED ballast
using the FL7701. The input voltage range is 90VRMS – 265VRMS and there is one DC
output with a constant current of 85mA at 28VMAX. This document contains general
description of FL7701, the power supply specification, schematic, bill of materials, and
the typical operating characteristics.
1.1.
General Description
The FL7701 LED lamp driver is a simple IC with PFC function. The special “adopted
digital” technique automatically detects input voltage condition and sends an internal
reference signal, resulting in high power factor. When an AC input voltage is applied to
the IC, the PFC function is automatically enabled. Otherwise, when a DC input is applied
to the IC, the PFC function is automatically disabled. The FL7701 does not require a bulk
capacitor (electrolytic capacitor) for supply rail stability, which can significantly affect
LED reliability.
1.2.
Key Features














Digitally Implemented Active PFC Function
Built-in Self-Biasing HV Startup Circuit
Application Input Range: 80VAC ~ 308VAC
AOCP Function with Auto-Restart Mode
Built-in Over-Temperature Protection
Cycle-by-Cycle Current Limit
Current-Sense Pin Open Protection
Low Operating Current: 0.85mA (Typical)
Under-Voltage Lockout with 5V Hysteresis
Programmable Oscillator Frequency
Programmable LED Current
Analog Dimming Function
Fixed Soft-Start Function
Precise Internal Reference: ±3%
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
1.3.
Internal Block Diagram
Figure 1. Internal Block Diagram
Pin Descriptions
Pin
Symbol
1
CS
2
OUT
Output. Connects to the MOSFET gate.
3
VCC
Supply Voltage. Supply pin for stable IC operation; ZCD signal detection used
for accurate PFC function.
4
RT
Resistor. Programmable operating frequency using an external resistor
connected to this PIN and the IC has fixed frequency when this pin is left open
or floating.
5
ADIM
Analog Dimming. Connects to the internal current source and can change the
output current using an external resistor. If ADIM is not used, connect a 0.1µF
bypass capacitor between ADIM and GND.
6
GND
GROUND. Ground for the IC.
7
NC
No Connection
8
HV
High Voltage. Connect to the high-voltage line and supply current to the IC
© 2012 Fairchild Semiconductor Corporation
Description
Current Sense. Limits output current, depending on the sensing resistor
voltage. The CS pin is also used to set the LED current regulation.
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FEBFL7701_L30U003A • Rev. 1.0.2
2.
General Specifications for Evaluation Board
All data for this table was measured at an ambient temperature of 25°C
Table 1.
Summary of Features and Performance
Description
Input Voltage Range
AC Input Frequency
Output Voltage/Current
Output Power
Symbol
Value
VIN,min
90V
VIN,nom
220V
VIN,max
265V
fIN,min
47Hz
fIN,max
64Hz
VOUT
28V
IOUT
85mA
Output Power
2.41W
Note 2
>78%
At full load
Efficiency
Temperature
Comments
TFL7701
< 71.5°C
TMOSFET
< 59.5°C
TINDUCTOR
< 57.5°C
Note 1
At full load (all at open frame, room
temperature / still air)
PCB Size
20mm (width) x 32mm (length) x 13mm
(height)
Initial Application
LED bulb
Notes:
1. The output current has ILEDPK ripple. To reduce ripple current, use a large electrolytic capacitor in
parallel with the LED. Ensure the capacitor voltage rating is high enough to withstand an open-LED
condition or use a Zener diode for protection.
2. The output power is not equal to the apparent power due to the slight phase shift between the output
voltage and current.
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
3.
Photographs of the Evaluation Board
Figure 2. Photograph Top View (20mm x 32mm x 13mm)
Figure 3. Photograph Bottom View (20mm x 32mm x 13mm)
Figure 4. Photograph Side View (20mm x 32mm x 13mm)
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
4.
Printed Circuit Board
Figure 5. PCB, Top Side
Figure 6. PCB, Bottom Side
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
5.
Schematic
Figure 7. Schematic of Evaluation
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
6.
Bill of Materials
Qty Reference
Part Number
Value
Description
Manufacturer
Controller
Fairchild
Semiconductor
PCB Silkscreen
1
U1
FL7701
1
BD
MB6S
0.5A /
600V
Diode, Bridge, 600V, 0.5A
Fairchild
Semiconductor
1
C1
MPE 630V223K
22nF
Capacitor, 630VAC, 10%,
Polypropylene
Sungho
C1
1
C2
MPE 630V333K
33nF
Capacitor, 630VAC, 10%,
Polypropylene
Sungho
C2
1
C3
C0805C101K3RACTU
100pF
Capacitor, SMD, Ceramic,
25V, X7R
Kemet
ADIM
1
C4
C1206C225K3PACTU
2.2µF
Capacitor, SMD, Ceramic,
25V, X7R
Kemet
VCC
1
D1
UF4007
1A /
1kV
Diode, 1kV, 1A Ultra-Fast
Recovery
Fairchild
Semiconductor
FRD
1
D2
1N4148
1A /
100V
100V/1A, Small-Signal
Diode
Fairchild
Semiconductor
4148
2
L1, L2
R06153KT00
15mH
Inductor, Radial, R6.5x7.5
Bosung
L1, L2
1
L3
R06402KT00
4mH
Inductor, Radial, R6.5x7.5
Bosung
L3
1
R1
RC1206JR-07680RL
680R
Resistor,SMD,1/4W,1206
Yageo
1
R2
RC1206JR-0710KL
10k
Resistor,SMD,1/4W,1206
Yageo
1
R3
RC0805JR-0724KL
24k
Resistor,SMD,1/8W,0805
Yageo
RT
1
R4
RC0805JR-07510RL
510R
Resistor,SMD,1/8W,0805
Yageo
RG
1
R5
RC1206JR-073RL
3.0R
Resistor,SMD,1/4W,1206
Yageo
RCS
7.
Test Condition & Test Equipment
Evaluation Board
FEBFL7701_L30U003A
Test Date
2012.01.19
Test Temperature
TA = 25°C
Test Equipments
AC Source: PCR500L by Kikusui
Power Meter: PZ4000 by Yokogawa
Oscilloscope: Waverunner 64Xi by Lecroy
EMI Test Receiver: ESCS30 by ROHDE & SCHWARZ
Two-Line V-Network: ENV216 by ROHDE & SCHWARZ
Thermometer: CAM SC640 by FLIR SYSTEMS
LED: EHP-AX08EL/GT01H-P03 (3W) by Everlight
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
8.
Test Waveforms
8.1.
Typical Waveforms: Startup
Figure 8 through Figure 11 show the typical startup performance at different input
voltage conditions. When AC input voltage is applied to the system, the FL7701
automatically operates in AC Mode after finishing an internally fixed, seven-cycle, softstart period. Figure 10 and Figure 11 show the soft-start characteristics when a DC input
voltage is applied.
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 8. Soft-Start Characteristics, AC Mode, 90VAC Figure 9. Soft-Start Characteristics, AC Mode, 265VAC
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 10. Soft-Start Characteristics, DC Mode, 100VDC Figure 11. Soft-Start Characteristics, DC Mode, 200VDC
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
8.2.
Operating Frequency & Minimum Duty
The programmable switching frequency is between 20kHz ~ 250kHz, determined by
selecting the RT resistor value. If no RT resistor is used (RT pin OPEN), the FL7701
default switching frequency is set to 45kHz. The maximum duty ratio is fixed below 50%
and has a fixed minimum typical on-time of 400ns. There are two crucial points to design
properly. The first is consideration of the minimum duty ratio at minimum input voltage
because the FL7701 is limited to 50% duty ratio. The second consideration is minimum
on-time at maximum input voltage condition. The FL7701 cannot control output power
when the operating conditions are such that the required on-time is less than the 400ns
minimum on-time.
Minimum on time:
1.12µs
Switching frequency:
69.91kHz
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 12. Operating Frequency & Minimum Duty
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
8.3.
Typical Waveforms: Steady State
Figure 13 through Figure 22 show the normal operation waveform by input voltage &
input frequency. The output voltage and current maintains a certain output level with
120Hz ripple, as shown in the test results in Table 2.
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 13. Input Voltage: 90VAC, Input Frequency: 47Hz Figure 14. Input Voltage: 90VAC, Input Frequency: 64Hz
H1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
H1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 15. Input Voltage: 110VAC, Input Frequency:
47Hz
Figure 16. Input Voltage: 110VAC, Input Frequency:
64Hz
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
Typical Operating Waveforms: Output Characteristics
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 17. Input Voltage: 180VAC, Input Frequency:
47Hz
Figure 18. Input Voltage: 180VAC, Input Frequency:
64Hz
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 19. Input Voltage: 220VAC, Input Frequency:
47Hz
Figure 20. Input Voltage: 220VAC, Input Frequency:
64Hz
H1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 21. Input Voltage: 265VAC, Input Frequency:
47Hz
H1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 22. Input Voltage: 265VAC, Input Frequency:
64Hz
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
Table 2.
Output Characteristics by Input Voltage & Frequency
47Hz
64Hz
VLED(RMS)
ILED(RMS)
VLED(RMS)
ILED(RMS)
90VAC
27.91V
84.45mA
27.90V
84.58mA
110VAC
27.99V
84.41mA
28.02V
84.49mA
180VAC
28.13V
84.94mA
28.10V
84.86mA
220VAC
28.12V
85.66mA
28.14V
85.77mA
265VAC
28.17V
87.05mA
28.13V
87.05mA
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
8.4.
Typical Waveforms: Abnormal Mode (LED Open)
Figure 23 and Figure 24 show the open-load condition test method and result. When the LED
disconnects from the system, the IC cannot operate because the HV pin is disconnected.
Figure 23.
Open-Load Condition Test
CH1: VCC, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 24.
© 2012 Fairchild Semiconductor Corporation
Test Results of Open-Load Condition
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FEBFL7701_L30U003A • Rev. 1.0.2
8.5.
Typical Waveforms: Abnormal Mode (Inductor Short
Condition)
Figure 25 and Figure 26 show the test method and result of an inductor short condition.
The FL7701 uses an abnormal over-current protection (AOCP) function, limiting the
current on RCS in the event of an inductor short condition.
Figure 25.
Inductor Short Condition
When CS pin voltage reached
2.5V, AOCP operates after
internal delay time 70ns (typical)
CH1: VCS, CH2: VDRAIN, CH3: VLED, CH4: ILED
Figure 26.
© 2012 Fairchild Semiconductor Corporation
Test Results of Inductor Short Condition
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FEBFL7701_L30U003A • Rev. 1.0.2
9.
Performance of Evaluation Board
9.1.
Power Factor at Rated Load Condition
Figure 27 shows the system PF performance for the entire input voltage range (90V to
265V) at different input frequency conditions (47Hz, 64Hz). The PF slightly changes
according to the input frequency but can achieve over 86% at 265VAC condition.
100
95
90
85
80
[%]
75
PF_47Hz
70
PF_64Hz
65
60
55
50
90
110
180
220
264
[VAC]
Figure 27. Power Factor
Table 3.
PF Test Results
Input Voltage
90VAC
110VAC
180VAC
220VAC
265VAC
© 2012 Fairchild Semiconductor Corporation
Power Factor
47Hz
96.31
64Hz
97.34
47Hz
96.72
64Hz
96.89
47Hz
94.41
64Hz
93.74
47Hz
92.49
64Hz
91.09
47Hz
89.71
64Hz
86.56
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FEBFL7701_L30U003A • Rev. 1.0.2
9.2.
System Efficiency
Figure 28 shows system efficiency results for different AC input voltage frequency
conditions. As shown, the input frequency has negligible effect on system efficiency.
100
95
90
85
80
[%]
Efficiency_47Hz
75
Efficiency_64Hz
70
65
60
55
50
90
110
180
220
264
[VAC]
Figure 28. System Efficiency
Table 4.
Efficiency Test Results
Input Voltage
90VAC
110VAC
180VAC
220VAC
265VAC
© 2012 Fairchild Semiconductor Corporation
18
Frequency
Efficiency (%)
47Hz
83.56
64Hz
83.83
47Hz
83.36
64Hz
83.46
47Hz
80.04
64Hz
80.06
47Hz
77.68
64Hz
77.69
47Hz
75.11
64Hz
75.22
FEBFL7701_L30U003A • Rev. 1.0.2
9.3.
THD Performance
Figure 29 shows the THD performance at different input frequencies. Test results are
quite similar, except the 90VAC condition, but meets international regulations
(under 30%).
30
25
[%]
20
THD_47Hz
15
THD_64Hz
10
5
0
90
110
180
220
264
[VAC]
Figure 29. THD Performance
Table 5.
THD Test Results
Input Voltage
90VAC
110VAC
180VAC
220VAC
265VAC
© 2012 Fairchild Semiconductor Corporation
19
Frequency
THD (%)
47Hz
20.99
64Hz
21.82
47Hz
22.26
64Hz
22.46
47Hz
24.96
64Hz
25.31
47Hz
25.50
64Hz
25.84
47Hz
25.75
64Hz
26.72
FEBFL7701_L30U003A • Rev. 1.0.2
9.4.
Thermal Performance
Figure 30 through Figure 37 show the steady-state thermal results with different input
voltage conditions. Inductor L3 has the highest temperature on the top side of the PCB
due to copper resistance. The FL7701 has the highest temperature on the bottom side of
the PCB due to power loss associated with the high-voltage device. The IC temperature is
66.5°C for the 220VAC input condition.
Figure 30. Thermal Test Result, Bottom-Side
Temperature at 90VAC Condition (IC)
Figure 31. Thermal Test Result, Top-Side Temperature
at 90VAC Condition (Inductor)
Figure 32. Thermal Test Result, Bottom-Side
Temperature at 110VAC Condition (IC)
Figure 33. Thermal Test Result, Top-Side Temperature
at 110VAC Condition (Inductor)
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
Figure 34. Thermal Test Result, Bottom-Side
Temperature at 220VAC Condition (IC)
Figure 35. Thermal Test Result, Top-Side Temperature
at 220VAC Condition (Inductor)
Figure 36. Thermal Test Result, Bottom-Side
Temperature at 264VAC Condition (IC)
Figure 37. Thermal Test Result, Top-Side Temperature
at 264VAC Condition (Inductor)
Table 6.
Temperature performance by Input voltage
Input Voltage
TIC
TMOSFET
TINDUCTOR
90VAC
47.6°C
46.2°C
47.8°C
110VAC
51.4°C
46.9°C
47.8°C
220VAC
66.5°C
55.0°C
54.6°C
265VAC
71.5°C
59.5°C
57.7°C
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
9.5.
EMI Results
EMI test measurements were conducted in observance of CISPR22 criteria, which has
tighter stricter limits than CISPR15 for lighting applications.
Figure 38.
Figure 39.
© 2012 Fairchild Semiconductor Corporation
EMI Test Results, Conducted Emission-Line at 110VAC Input Condition,
Full Load (10-LED Series)
EMI Test Results, Conducted Emission-Neutral at 110VAC Input Condition,
Full Load (10-LED Series)
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FEBFL7701_L30U003A • Rev. 1.0.2
Figure 40.
EMI Test Results, Conducted Emission-Neutral at 220VAC Input Condition,
Full Load (10-LED Series)
Figure 41.
EMI Test Results, Conducted Emission-Neutral at 220VAC Input Condition,
Full Load (10-LED Series)
© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
10. Revision History
Rev.
Date
0.0.1
2011.11.16
1.0.1
2011.11.30
Update IC temperature
2012.2.20
Modified, edited, formatted document. Changed User Guide number from
FEB_L030 to FEBFL7701_L30U003A
1.0.2
Description
First issue
WARNING AND DISCLAIMER
Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Users’ Guide. Contact an
authorized Fairchild representative with any questions.
This board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk. The
Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this User’s Guide constitute a sales contract or create any kind
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© 2012 Fairchild Semiconductor Corporation
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FEBFL7701_L30U003A • Rev. 1.0.2
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