Fairchild FEBFAN7688SJXA_CP14U306 User manual

© 2015 Fairchild Semiconductor Corporation 1 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
User Guide for
FEBFAN7688SJXA_CP14U306
Evaluation Board
306 W/12 V PC Application
with 12 VSB Module
Evaluation Board
Featured Fairchild Product:
FAN7688
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com

© 2015 Fairchild Semiconductor Corporation 2 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
Table of Contents
1. Introduction............................................................................................................................... 3
1.1. Features ............................................................................................................................ 3
2. Evaluation Board Specifications............................................................................................... 4
3. Photograph................................................................................................................................ 4
4. Printed Circuit Board (PCB)..................................................................................................... 5
5. Schematic.................................................................................................................................. 6
6. Bill of Materials........................................................................................................................ 7
7. Transformer and Winding Specifications............................................................................... 12
7.1. Main Transformer (TX1) ............................................................................................... 12
7.2. Resonant Inductor (L4) .................................................................................................. 13
7.3. Pulse Transformer (TX2) ............................................................................................... 14
7.4. Current Transformer (TX4)............................................................................................ 15
7.5. PFC Inductor (L3) .......................................................................................................... 16
7.6. 12 V Standby Transformer (TX3).................................................................................. 17
7.7. EMI Choke (L1, L2)....................................................................................................... 18
8. Test Conditions & Test Equipment......................................................................................... 19
8.1. Features .......................................................................................................................... 19
9. Performance of Evaluation Board........................................................................................... 20
9.1. Current Harmonic Test:.................................................................................................. 20
9.2. AC Trim Up & Trim Down............................................................................................ 23
9.3. Efficiency ....................................................................................................................... 23
9.4. Output Transient Response ............................................................................................ 24
9.5. 390 V to 358 V && 358 V to 390 V at Loading............................................................ 25
9.6. 390 V to 358 V && 358 V to 390 V at Vrms ................................................................ 25
9.7. Hold up Time ................................................................................................................. 25
9.8. AC Cycle Drop............................................................................................................... 26
9.9. AC Transient .................................................................................................................. 26
9.10. Surge & ESD.................................................................................................................. 27
9.11. EMI Conduction............................................................................................................. 27
10. Revision History ..................................................................................................................... 28

© 2015 Fairchild Semiconductor Corporation 3 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
This user guide supports the 306 W evaluation board for the 80Plus Platinum solution
based on a Continuous Conduction Mode (CCM) PFC and LLC convertor using the
FAN6982 with the FAN7688. It should be used in conjunction with the FAN7688
datasheet as well as Fairchild’s application notes and technical support team. Please visit
Fairchild’s website at www.fairchildsemi.com.
1. Introduction
The LLC converter in this Evaluation Board (EVB) is controlled by the FAN7688; it’s a
16-pin controller and locates in secondary side. The FAN7688 includes PFM and PWM
controls to optimization efficiency for all loading, its combine advantage SR control
improves efficiency. It employs a current mode control technique based on charge
control; this provides a better control-to-output and line-to-output transfer function of the
power stage, simplifying the feedback loop design while allowing true input power limit
capability. The PFC is controlled by the FAN6982, based on Continuous Conduction
Mode (CCM), which employs leading edge modulation for average current control and
has a number of advanced features for better performance and reliability.
1.1. Features
LLC:
Secondary Side PFM Controller with Synchronous Rectifier Control
Charge Current Control for better Transient Response and Simplified Feedback Loop
Design
Adaptive Synchronous Rectification Control with Dual Edge Tracking
Closed Loop Soft-Start
Green Functions to Improve Light Load Efficiency
- Symmetric PWM Control at Light Load to Limit the Switching Frequency while
Reducing Switching Losses
- Disabling SR During Light Load Operation
Complete Protection Functions with Auto-Restart
PFC:
Continuous Conduction Mode and Average-Current-Mode Control
Power-On Sequence Control
Brownout Protection
Fulfills Class-D Requirements of IEC 61000-3-2
Universal AC Input Voltage
Efficiency Optimization by External Output Voltage Adjustable Circuit

© 2015 Fairchild Semiconductor Corporation 4 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
2. Evaluation Board Specifications
All data for this table was measured at an ambient temperature of 25°C.
Table 1. Summary of Features and Performance
Description
Symbol
Value
Comments
Output Power
PO
306 W
Efficiency
Eff, η
Meet 80PLUS Platinum
Input Voltage
VAC
90~264 V
Input Frequency
47~63 Hz
PFC Output Voltage
VPFC
356 V / 392 V
Output Voltage
VOUT
12 V
100% Load = 300 W
12 V Standby Output
V12VSB
12 V
100% Load = 6 W
Brown-In / Out Voltage
VAC
85 V / 73 V
PFC Frequency
fSW
65 kHz
LLC Frequency
fLLC
39 k~150 kHz
EVB Size
L * W * H
145 mm*122 mm*48 mm
Does not include the
metal case
3. Photograph
Figure 1. Top View of Evaluation Board (EVB does not include the metal case)
PFC
LLC
Standby
AC Input
DC Ounput

© 2015 Fairchild Semiconductor Corporation 5 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
4. Printed Circuit Board (PCB)
Figure 2. Top Side of Evaluation Board
Figure 3. Bottom Side of Evaluation Board

© 2015 Fairchild Semiconductor Corporation 6 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
5. Schematic
Figure 4. Evaluation Board Schematic

© 2015 Fairchild Semiconductor Corporation 7 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
6. Bill of Materials
FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)
Item
Reference
Qty.
Part No.
Value
Description
Manufacturer
1
JP
1
JUMPER WIRE 0.6ψ
2
C13
1
47 pF
C0603 X7R ±10% 50 V
3
C42
1
100 pF
C0603 X7R ±10% 50 V
4
C38
1
470 pF
C0603 X7R ±10% 50 V
5
C51
1
680 pF
C0603 X7R ±10% 50 V
6
C21, C35, C46,
C50, C64, C65,
C66, C67, C73
9
1 nF
C0603 X7R ±10% 50 V
7
C24
1
2.2 nF
C0603 X7R ±10% 50 V
8
C40, C41
2
3.3 nF
C0603 X7R ±10% 50 V
9
C47
1
4.7 nF
C0603 X7R ±10% 50 V
10
C31, C52
2
47 nF
C0603 X7R ±10% 50 V
11
C33, C34
2
10 nF
C0603 X7R ±10% 50 V
12
C39
1
22 nF
C0603 X7R ±10% 50 V
13
C20, C36, C37
3
100 nF
C0603 X7R ±10% 50 V
14
C48
1
220 nF
C0603 X7R ±10% 50 V
15
C32, C49
2
470 nF
C0603 X7R ±10% 16 V
16
C57, C58, C59,
C60, C61, C62,
C63, C68, C69,
C70, C71, C72,
C74
13
1 μF
C0603 X7R ±10% 50 V
17
C8
1
1 μF
C0805 X7R ±10% 50 V
18
C23
1
10 μF
C0805 X7R ±10% 25 V
19
C43
1
22 μF
C0805 X7R ±10% 25 V
20
R11, R16, R21
3
0 Ω
R0603 ±1%
21
R30, R31
2
2.2 Ω
R0603 ±1%
22
R10, R15, R20,
R58
4
10 Ω
R0603 ±1%
23
R26
1
17.4 Ω
R0603 ±1%
24
R25
1
42.2 Ω
R0603 ±1%
25
R8
1
51 Ω
R0805 ±1%
26
R69, R70, R71,
R72
4
100 Ω
R0603 ±1%
27
R19, R24, R112
3
220 Ω
R0603 ±1%
28
R107
1
330 Ω
R0603 ±1%
29
R41
1
1.24 KΩ
R0603 ±1%
30
R63
1
1.5 KΩ
R0603 ±1%
31
R90, R93
2
2 KΩ
R0603 ±1%
32
R111
1
2.2 KΩ
R0603 ±1%
33
R34
1
3 KΩ
R0603 ±1%

© 2015 Fairchild Semiconductor Corporation 8 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)
Item
Reference
Qty.
Part No.
Value
Description
Manufacturer
34
R64
1
3.3 KΩ
R0603 ±1%
35
R60, R105
2
4.7 KΩ
R0603 ±1%
36
R95, R96
2
4.99 KΩ
R0603 ±1%
37
R40
1
5.1 KΩ
R0603 ±1%
38
R55
1
6.98 KΩ
R0603 ±1%
39
R92, R94
2
8.25 KΩ
R0603 ±1%
40
R38, R65, R87,
R108, R117,
R118
6
10 KΩ
R0603 ±1%
41
R89
1
12 KΩ
R0603 ±1%
42
R120
1
12.4 KΩ
R0603 ±1%
43
R115
1
13.3 KΩ
R0603 ±1%
44
R88, R106, R114
3
15 KΩ
R0603 ±1%
45
R12, R17, R22,
R32, R33, R39,
R54, R57, R102,
R104, R110
11
20 KΩ
R0603 ±1%
46
R68, R101
2
24.9 KΩ
R0603 ±1%
47
R59, R119
2
27 KΩ
R0603 ±1%
48
R52
1
27.4 KΩ
R0603 ±1%
49
R51
1
36 KΩ
R0603 ±1%
50
R37
1
38.3 KΩ
R0603 ±1%
51
R44
1
43.2 KΩ
R0603 ±1%
52
R103
1
47 KΩ
R0603 ±1%
53
R66
1
51 KΩ
R0603 ±1%
54
R129
1
73.2 KΩ
R0603 ±1%
55
R122, R126
2
75 KΩ
R0603 ±1%
56
R125
1
91 KΩ
R0603 ±1%
57
R99
1
147 KΩ
R0603 ±1%
58
R67, R97, R98,
R127
4
200 KΩ
R0603 ±1%
59
R56
1
357 KΩ
R0603 ±1%
60
R130 (Parallel
with R55)
1
1 MΩ
R0603 ±5%
61
R113, R116,
R121, R128
4
4.3 MΩ
R0603 ±5%
62
R47
1
0 Ω
R0805 ±1%
63
R61
1
10 KΩ
R0805 ±1%
64
R50
1
200 KΩ
R0805 ±1%
65
R49
1
3 KΩ
R1206 ±1%
66
R45, R46
2
100 KΩ
R1206 ±1%
67
R1, R2
2
470 KΩ
R1206 ±1%

© 2015 Fairchild Semiconductor Corporation 9 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)
Item
Reference
Qty.
Part No.
Value
Description
Manufacturer
68
R13, R14
2
499 KΩ
R1206 ±1%
69
R3, R4, R123,
R124
4
1 MΩ
R1206 ±5%
70
R5, R6
2
3 MΩ
R1206 ±5%
71
R9A, R9B
2
0.15 Ω
R2512 ±1% 2 W
72
R100
1
10 KΩ
VR
73
C1
1
0.68 μF
X2 Capacitor 275 V ±10%
(11.5*19.5*17.5 mm
Pitch=15 mm)
74
C2
1
0.47 μF
X2 Capacitor 275 V ±10%
(18*8.5*16.5 mm,
Pitch=15 mm)
75
C53, C54
2
CD12-E2GA222MYASA
2.2 pF
Y1 Capacitor 250 V ±20%
UNIVERSE
CONDENSER
76
C3, C4
2
0.22 pF
Y1 Capacitor 250 V ±20%
77
C9
1
4.7 pF
Y1 Capacitor 250 V ±20%
(19x8x10 mm)
78
C10
1
MP3S104J0630DB1151H
0.1 μF
MP3S Capacitor DC630V
FUH BANG
79
C25
1
22 μF
Electrolytic Capacitor 50 V
105°C 5*11 mm LHK
HONJU
80
C29
1
220 μF
Electrolytic Capacitor 16 V
105°C 6.3*11 mm GF
SAMXON
81
C7
1
270 μF
Electrolytic Capacitor
450 V 105°C 25*45 mm LP
SAMXON
82
C27
1
470 μF
Solid Capacitor 16 V
8*11.5 mm ULR
HE SHEN TANG
83
C28
1
1000 μF
Electrolytic Capacitor 16 V
105°C 8*18 mm
84
C17, C18, C19
3
2200 μF
Electrolytic Capacitor 16 V
105°C 10*25 mm
85
C16
1
470 μF
Solid Capacitor 16 V
10*11.5 mm PSF
HE SHEN TANG
86
C5
1
TF105K2Y159L270D9R
1 μF
MTF Capacitor 450 V
±10%
KENJET
TECHNOLOGY
87
BD1
1
DFB2560
Bridge 25 A/600 V
TS-6P
Fairchild
88
D1
1
ISL9R860P2
Diode 8 A/600 V TO-220
Fairchild
89
D10
1
UF4007
Diode 1 A/1000 V DO-41
Fairchild
90
D12
1
1N4935
Diode 1 A/200 V DO-41
Fairchild
91
D14
1
EGP30D
Diode 3 A/200 V
Fairchild
92
D19, D20, D21,
D22
4
1N4148WS
Diode SOD-32F
Fairchild
93
D2
1
S3J
Diode 3 A/600 V SMC
Fairchild
94
D3, D4, D5, D11,
D15, D16, D17,
D18
8
LL4148
Diode 200 mA/100 V
SOD80
Fairchild

© 2015 Fairchild Semiconductor Corporation 10 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)
Item
Reference
Qty.
Part No.
Value
Description
Manufacturer
95
D9
1
P6KE200A
TVS
Fairchild
96
Q1, Q6, Q7
3
FCP170N60
MOS 22 A/ 600 V TO-220
Fairchild
97
Q13, Q14, Q27,
Q28, Q29
5
2N7002
SOT-23
Fairchild
98
Q15, Q17, Q19,
Q21, Q25
5
MMBT2222A
SOT-23
Fairchild
99
Q24
1
NDS0605
-0.18 A/ -60 V SOT-23
Fairchild
100
Q3, Q4, Q5, Q12,
Q16, Q18, Q20,
Q22, Q23, Q26
10
MMBT2907A
SOT-23
Fairchild
101
Q8, Q9
2
FDMS8320L
100 A /40 V, Power56
Fairchild
102
U1
1
FAN6982MY
IC SO-14L
Fairchild
103
U2
1
FAN7688SJX
IC
Fairchild
104
U3
1
FSL137MRIN
MDIP 8L
Fairchild
105
U4, U6
2
FODM121C
MFP 4L
Fairchild
106
U5
1
KA431LZTA
TO-92R
Fairchild
107
U8, U9, U10
3
LM358M
SO-8L
Fairchild
108
L1, L2
2
SN20128A
EMI Choke
FORMOSA
SHING GA
109
L3
1
Inductor QP2920H 420 μH
YUJING
110
L4
1
102Q553
Inductor EQ20 120 μH
SUMIDA
111
L5
1
Inductor 0.75 μH
SHOWWELL
112
TX1
1
FPQ032014175V-PF
Transformer
PQ3230 (PC44)
SHOWWELL
113
TX2
1
750342754
Transformer EE13
Würth Elektronik
114
TX3
1
078Q561
Transformer EQ20
SUMIDA
115
TX4
1
750342753
Transformer EE8.3
Würth Elektronik
116
L6
1
TRN-00199
117
TR
1
TTC104
100 KΩ
NTC 5ψ
118
FAN
1
Connect WAFER
(2530HHS) 2P 2.5 mm
180°
119
F1
1
FUSE GLASS 7 A/250 V
QUICK 5*20 mm
120
MOV1
1
TVR10471KSY
Varistor ATOM MOV
121
NTC1
1
SCK132R56MYS
NTC 13ψ SCK2R56
122
HS1
1
MCH0146
Heat Sink
123
HS2, HS3
2
Heat Sink
124
2
Power Cable
1007#16AWG +3.2ψ
HOOK
YIYI
125
12VSB, GND
2
Test Pin

© 2015 Fairchild Semiconductor Corporation 11 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)
Item
Reference
Qty.
Part No.
Value
Description
Manufacturer
126
1
Heat Shrinkable Tubing
3*15 mm
127
1
Heat Shrinkable Tubing
6*20 mm
128
3
MCH0040 Bead Core C8B
3.5*3.2*1.0
129
4
Bushing TO220 602M
130
4
Silicone Sheet TO-220
131
2
Screws 3ψ12 mm
132
6
Nut 3ψ
133
4
Copper Tube M3
6.5*6 mm
134
1
CANADA Silicone
ES2482W 333 ml
135
2
Heat Shrinkable Tubing
3*7.5 mm (for YS-201M)
136
SPG1, SPG2
2
Surge Absorber
YS-201M

© 2015 Fairchild Semiconductor Corporation 12 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7. Transformer and Winding Specifications
7.1. Main Transformer (TX1)
Core: PQ3230 (PC44)
Bobbin: 12 Pins
Figure 5. Transformer Specifications of TX1
Table 2. Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
5 →4
0.7φ×1
20
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
3
N2
10 → 9
Copper foil
0.3 mm (3T),
W=15 mm
Copper Foil to
Pin, 0.7φ*2
3
N2, N3 are the same
copper foil
4
N3
9 → 11, 12
3
5
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
6
N4
4 → 3
0.7φ×1
20
Solenoid Winding
7
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
8
0.8T Open loop shielding to PIN2
9
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
10
1.2T Close loop shielding on outside to PIN2
11
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Table 3. Electrical Characteristics
Pins
Specifications
Inductance
3 - 5
1.75 mH ±5%
10
5
3
11, 12
N2
N1
N4
4
N3
9

© 2015 Fairchild Semiconductor Corporation 13 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7.2. Resonant Inductor (L4)
Core: EQ20 (TP5)
Bobbin: 10 Pins
Figure 6. Transformer Specifications of L4
Table 4. Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
1 →5
0.1φ×40
24
Solenoid Winding
Table 5. Electrical Characteristics
Pins
Specifications
Inductance
1 - 5
120 μH ±5%
1
Top View
Cut off
N1
12345
109876
5

© 2015 Fairchild Semiconductor Corporation 14 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7.3. Pulse Transformer (TX2)
Core: EE13 (3C90)
Bobbin: 10 Pins
Figure 7. Transformer Specifications of TX2
Table 6. Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
3 →5
0.2φ×1
15
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
3
N2
9 →10
0.15φ×1
18
Solenoid Winding
Transformer Triple
Wire
4
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
5
N2
7 →6
0.2φ×1
18
Solenoid Winding
6
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Table 7. Electrical Characteristics
Pins
Specifications
Inductance
3 –5
>200 μH
9
3
6
N2
N1
5
N3
10
7
Top View
Cut off
12345
109876

© 2015 Fairchild Semiconductor Corporation 15 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7.4. Current Transformer (TX4)
Core: EE8.3 (3C90)
Bobbin: 4 Pins
Figure 8. Transformer Specifications of TX4
Table 8. Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
4 →3
0.1φ×50
0.75
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
3
N2
2 →1
0.15φ×1
80
Solenoid Winding
4
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Table 9. Electrical Characteristics
Pins
Specifications
Inductance
1 –2
> 4 mH
2
4
N2
N1
3
1
Top View
Cut off
12
43

© 2015 Fairchild Semiconductor Corporation 16 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7.5. PFC Inductor (L3)
Core: QP2920H (3C94)
Bobbin: 4 Pins
Figure 9. Transformer Specifications of L3
Table 10. Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
1 →3
0.1φ×50
40
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Table 11. Electrical Characteristics
Pins
Specifications
Inductance
1 –2
420 μH ± 5%
1
N1
3
Bottom View

© 2015 Fairchild Semiconductor Corporation 17 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7.6. 12 V Standby Transformer (TX3)
Core: EQ20 (TP5)
Bobbin: 10 Pins
Figure 10. Transformer Specifications of TX3
Table 12. Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
10 →8
0.2φ×1
49
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
3
N2
6 →7
0.25φ×2
11
Solenoid Winding
Transformer Triple
Wire
4
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
5
N2
8 →9
0.2φ×1
22
Solenoid Winding
6
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
7
N2
2 →1
0.15φ×1
15
Solenoid Winding
8
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
9
N2
5 →4
0.2φ×1
16
Solenoid Winding
10
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
11
1.2T Close loop shielding on outside to PIN1
12
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Table 13. Electrical Characteristics
Pins
Specifications
Inductance
10 –9
820 μH ± 5%
9
1
Bottom View
N4
2
7
N2
N1
12345
109876
N3
8
N5
5
4
Cut off
10
6

© 2015 Fairchild Semiconductor Corporation 18 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
7.7. EMI Choke (L1, L2)
Figure 11. Transformer Specifications of L1 and L2

© 2015 Fairchild Semiconductor Corporation 19 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
8. Test Conditions & Test Equipment
8.1. Features
Table 14. Test Conditions & Test Equipment
Test Mode
FEBFAN7688SJXA_CP14U306
Test Date
May 29, 2015
Test Temperature
Ambient 25ºC
Test Equipment
AC Source: EXTECH 6800
AC/DC Electronic Load: Chroma 63030
Power Meter: Chroma 6630
Oscilloscope: Lecroy 24MXs-B
Test Items
1. Current Harmonic
2. AC Trim up & Trim down
3. Efficiency
4. Output Transient Response
5. 392 V to 354 V && 354 V to 392 V @Loading
6. 392 V to 354 V && 354 V to 392 V @Vrms
7. Hold-up time
8. AC Cycle Drop
9. AC Transient
10. SURGE & ESD
11. EMI
Test Loading
306 W (Loading shown in Amps)
Loading
12V1
12V2
12Vsb
100%
12.5
12.5
0.5
50%
6.25
6.25
0.25
20%
2.5
2.5
0.1
Min.
1.25
1.25
0.05

© 2015 Fairchild Semiconductor Corporation 20 FEBFAN7688SJXA_CP14U306 • Rev. 1.1
9. Performance of Evaluation Board
9.1. Current Harmonic Test:
Test Condition:
Measure input current power factor (PF) and total harmonic distortion (THD, IEC61000-
3-2, Class D) at various line and output loading.
A PF less than 0.95 in 230 V/50 Hz can cause a fast response of PFC voltage loop in
some test requirement; it can be fine tuned to meet PF > 0.95 when it is needed.
Test Results:
Figure 12. Input Current Waveform and THD Test Result in 115 VAC
75 W Load, 100 V/50 Hz
Figure 13. Input Current Waveform and THD Test Result in 115 VAC, Mid. Load
Input Voltage
Condition
PF
THD (%)
Class D
100 V/50 Hz
Input 75 W
0.983
14.170
Pass
Mid. Load
0.980
13.390
Pass
100% Load
0.992
8.310
Pass
230 V/50 Hz
Input 75 W
0.879
17.330
Pass
Mid. Load
0.939
16.410
Pass
100% Load
0.976
11.560
Pass