www.fairchildsemi.com
Fairchild Reference Design
This reference design supports inclusion of FL7701 in design of LED illumination. 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
http://www.fairchildsemi.com.
Application
Fairchild Device
Input Voltage
Range
Rated Output
Power
Output Voltage
(Rated Current)
LED Bulb
FL7701
90 VAC ~ 265 VAC
2.7 W
9 V (0.3 A)
Key Features













Digital Implemented Active PFC Function
Built-in HV Supplying Circuit: Self Biasing
AOCP Function with Auto-Restart Mode
Built-in Over-Temperature Protection (OTP)
Cycle-by-Cycle Current Limit
Current Sense Pin Open Protection
Low Operating Current: 0.85 mA (Typ.)
Under-Voltage Lockout (UVLO) with 5 V Hysteresis
Programmable Oscillation Frequency
Programmable LED Current
Analog Dimming Function
Soft-Start Function
Precise Internal Reference: ±3%
© 2012 Fairchild Semiconductor Corporation
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RD-L033_FL7701 • Rev. 1.0.1
www.fairchildsemi.com
1. Schematics
Figure 1.
Figure 2.
© 2012 Fairchild Semiconductor Corporation
Schematic
Real Board Size and Pictures
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2. Bill of Materials
Item
No.
Reference
Qty
Part Number
Description
Manufacturer
1
U1
1
FL7701
Controller
Fairchild
Semiconductor
2
D1
1
MB6S
600 V / 0.5 A, Bridge Diode
Fairchild
Semiconductor
3
C1,C2
2
MPE 630V333K
33 nF / 630 VAC, 10%,
Polypropylene
Sungho
4
C3
1
C0805C101K3RACTU
100 pF / 25 V,
SMD Ceramic Capacitor, 2012
Kemet
5
C4
1
C0805C225K3RACTU
2.2 µF / 25 V,
SMD Ceramic Capacitor, 2012
Kemet
6
C5
1
C0805C471K3RACTU
470 pF / 25 V,
SMD Ceramic Capacitor, 2012
Kemet
7
C6
1
C1206C106KDRACTU
10 µF / 630 V,
SMD Ceramic Capacitor, 3216
Kemet
8
D3
1
S100
100 V / 1 A, Schottky Diode
Fairchild
Semiconductor
9
D4
1
UF4007
1 kV / 1 A,
Ultra-Fast Recovery Diode
Fairchild
Semiconductor
10
D5
1
FLZ12VC
12 V Zener Diode 0.5 W
Fairchild
Semiconductor
11
D2
1
1N4148
100 V / 200 mA,
Small Signal Diode
Fairchild
Semiconductor
12
L1,L2
2
AL04TB103K
10 mH, Axial Leaded Inductor
ABEL
13
T1
1
EE1312(Core)
11 mH, EE1312
TDK
14
R1,R2
2
RC1206JR-07103RL
10 kΩ, SMD Resistor, 3216
Yageo
15
R3,R4
2
RC0805JR-079R1L
9.1 Ω, SMD Resistor, 2012
Yageo
16
R5
1
RC0805JR-07203RL
20 kΩ, SMD Resistor, 2012
Yageo
17
R6
1
RC0805JR-07470RL
47 Ω, SMD Resistor, 2012
Yageo
18
R7
1
RC1206JR-07184RL
180 kΩ, SMD Resistor, 3216
Yageo
19
Q1
1
FQN1N60C
0.3 A, 600 V, RDS(on) = 11. 5 Ω
Fairchild
Semiconductor
© 2012 Fairchild Semiconductor Corporation
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RD-L033_FL7701 • Rev. 1.0.1
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3. Transformer Specification
Follow Safe Standard
Transformer Core: EE1312
Figure 3.
Transformer Bobbin Structure and Pin Configuration
Figure 4.
Table 1.
Transformer Winding Structure
Winding Specifications
No
Winding
Pin ( S  F )
Wire
Turns
Winding Method
1
N1
57
0.2Φ
37 Ts
Solenoid Winding
2
3
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
N2
78
4
5
0.2Φ
105 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
N3
8  10
6
0.2Φ
105 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Table 2.
Winding Specifications
Inductance
© 2012 Fairchild Semiconductor Corporation
Pin
Specifications
Remark
5–10
11 mH ±10%
60 kHz, 1 V
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RD-L033_FL7701 • Rev. 1.0.1
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4. Performances
Efficiency [%]
Input Voltage [VAC]
Figure 5.
Table 3.
System Efficiency
Efficiency Test Result
Input Voltage
90 VAC
110 VAC
180 VAC
220 VAC
264 VAC
© 2012 Fairchild Semiconductor Corporation
Frequency
Efficiency (%)
47 Hz
76.30
64 Hz
76.55
47 Hz
77.24
64 Hz
77.23
47 Hz
76.53
64 Hz
76.48
47 Hz
75.24
64 Hz
75.29
47 Hz
73.67
64 Hz
73.69
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RD-L033_FL7701 • Rev. 1.0.1
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PF [%]
Input Voltage [VAC]
Figure 6.
Table 4.
Power Factor
Power Factor Test Result
Input Voltage
90 VAC
110 VAC
180 VAC
220 VAC
264 VAC
© 2012 Fairchild Semiconductor Corporation
Power Factor (%)
47 Hz
97.63
64 Hz
97.62
47 Hz
98.22
64 Hz
98.26
47 Hz
96.60
64 Hz
96.44
47 Hz
95.19
64 Hz
94.43
47 Hz
93.17
64 Hz
91.66
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RD-L033_FL7701 • Rev. 1.0.1
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THD [%]
Input Voltage [VAC]
Figure 7.
Table 5.
Total Harmonic Discharge Performance
Total Harmonic Discharge Test Result
Input Voltage
Frequency
THD (%)
47 Hz
19.55
64 Hz
19.56
47 Hz
14.05
64 Hz
14.15
90 VAC
110 VAC
180 VAC
220 VAC
264 VAC
© 2012 Fairchild Semiconductor Corporation
7
47 Hz
16.35
64 Hz
16.92
47 Hz
18.28
64 Hz
19.74
47 Hz
21.19
64 Hz
21.39
RD-L033_FL7701 • Rev. 1.0.1
www.fairchildsemi.com
Table 6.
Output Characteristics by Input Voltage and Frequency
47 Hz
64 Hz
VLED (VRMS)
VLED (VRMS)
VLED (VRMS)
VLED (VRMS)
90 VAC
8.94 V
8.94 V
8.94 V
8.94 V
110 VAC
9.10 V
9.09 V
9.09 V
9.10 V
180 VAC
9.32 V
9.34 V
9.34 V
9.32 V
220 VAC
9.37 V
9.37 V
9.37 V
9.37 V
264 VAC
9.44 V
9.45 V
9.45 V
9.44 V
5. Related Resources
Datasheet — FL7701 Smart Non-Isolated PFC Buck LED Driver
Reference Designs — http://www.fairchildsemi.com/referencedesign/
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© 2012 Fairchild Semiconductor Corporation
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RD-L033_FL7701 • Rev. 1.0.1