www.fairchildsemi.com
Fairchild Reference Design RD-574
The following reference design supports the design of a 60 W programmable LED engine
which is consist of a AC-DC boost Power-Factor-Correction (PFC) stage, a LLC resonant
converter supplying a constant regulated voltage to three Buck DC-DC LED drivers for
constant current and dimming control of 3 strings of LEDs. The LED engine has an input
voltage range from 90 VRMS to 300 VRMS and utilizes Fairchild’s FL7930B CRM PFC
controller, FAN7631 Half-Bridge LLC controller and FL3100T gate driver as well as
Atmel’s SAM D21 microcontroller. It should be used in conjunction with the product
datasheets as well as Fairchild’s application notes and technical support team. Please visit
Fairchild’s website at http://www.fairchildsemi.com.
1. System Specifications
Description
Voltage
Input
Frequency
Voltage
Output
Current
Efficiency
[Single Channel]
Standby Power
Symbol
Value
Comments
VIN.MIN
90 VAC
Minimum Input Voltage
VIN.MAX
300 VAC
Maximum Input Voltage
VIN.NOMINAL
120 V / 230 V
Nominal Input Voltage
fIN
60 Hz / 50 Hz
Line Frequency
VOUT_SINGLE
56 V
Output Voltage for Single Channel LED
VOUT_MULTI.
24 ~ 48 V
Output Voltage for Multi Channel LED
IOUT_SINGLE
1.1 A
Output Current for Single Channel LED
IOUT_MULTI.
0.6 A / CH
A Output Current per LED Channel
Eff90Vac
88.94%
Efficiency at 85 VAC Line Input Voltage
Eff120VAC
90.52%
Efficiency at 120 VAC Line Input Voltage
Eff140VAC
90.93%
Efficiency at 140 VAC Line Input Voltage
Eff180VAC
91.60%
Efficiency at 180 VAC Line Input Voltage
Eff230VAC
91.51%
Efficiency at 230 VAC Line Input Voltage
Eff300VAC
91.33%
Efficiency at 300 VAC Line Input Voltage
P90Vac
1.12 W
Standby Power at 85 VAC Line Input Voltage
P 120VAC
0.92 W
Standby Power at 120 VAC Line Input Voltage
P 140VAC
0.83 W
Standby Power at 140 VAC Line Input Voltage
P 180VAC
0.82 W
Standby Power at 180 VAC Line Input Voltage
P 230VAC
0.85 W
Standby Power at 230 VAC Line Input Voltage
P 300VAC
0.91 W
Standby Power at 300 VAC Line Input Voltage
PF/THD120VAC
0.995 / 6.80%
PF/THD at 120 VAC Line Input Voltage
PF/THD230VAC
0.936 / 7.53%
PF/THD at 230 VAC Line Input Voltage
Dimming Range
0.05% ~ 100%
Dimming Interface
PWM, Analog [Amplitude]
Protection
Short Circuit for LED
Number of LED channel
Three
EMI
FCC Title 47 Part 15 Class B
© 2016 Fairchild Semiconductor Corporation
1
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
2. Introduction
2.1. General Description of FL7930C
The FL7930C is an active Power Factor Correction (PFC) controller for low- to highpower lumens applications that operate in Critical Conduction Mode (CRM). It uses a
voltage-mode PWM that compares an internal ramp signal with the error amplifier output
to generate a MOSFET turn-off signal. Because the voltage-mode CRM PFC controller
does not need rectified AC line voltage information, it saves the power loss of an input
voltage-sensing network. FL7930C provides over-voltage, open-feedback, over-current,
input-voltage-absent detection, and under-voltage lockout protections. The FL7930B can
be disabled if the INV pin voltage is lower than 0.45 V and the operating current
decreases to a very low level. Using a new variable on-time control method, Total
Harmonic Discharge (THD) is lower than conventional CRM boost PFC ICs. The
FL7930C provides a PFC Ready pin that can be used to shutdown the boost power stage
when PFC output voltage reaches the proper level (with hysteresis).
2.2. Features















Additional PFC-Ready Function
Input-Voltage-Absent-Detection Circuit
Maximum Switching Frequency Limitation.
Internal Soft-Start with Overshoot Prevention
Internal Total harmonic Distortion (THD) Optimizer
Precise Adjustable Output Over-Voltage Protection (OVP)
Open-Feedback Protection and Disable Function
Zero Current Detector (ZDC)
150 μs Internal Startup Timer
MOSFET Over-Current Protection (OCP)
Under-Voltage Lockout with 3.5 V Hysteresis (UVLO)
Low Startup (40 μA) and Operating Current (1.5 mA)
Totem Pole Output with High State Clamp
+500 / -800 mA Peak Gate Drive Current
SOP-8 Package
© 2016 Fairchild Semiconductor Corporation
2
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
2.3. General Description of FAN7631
The FAN7631 is a pulse-frequency modulation controller for high-efficiency half-bridge
resonant converters that includes a high-side gate drive circuit, an accurate currentcontrolled oscillator, and various protection functions. The FAN7631 features include
variable dead time, high operating frequency up to 600 kHz, protections such as Line
Under-Voltage Lockout (LUVLO), and a selectable latch or A/R protection using the LS
pin for user convenience. The Zero-Voltage-Switching (ZVS) technique reduces the
switching losses and improves the efficiency significantly. ZVS also reduces the
switching noise noticeably, which allows a small Electromagnetic Interference (EMI)
filter. Offering everything necessary to build a reliable and robust resonant converter, the
FAN7631 simplifies designs and improves productivity and performance. The FAN7631
can be applied to resonant converter topologies such as series resonant, parallel resonant,
and LLC resonant converters.
2.4. Features











Variable frequency control with 50% duty cycle for half-bridge resonant
converter topologies
High efficiency through zero-voltage-switching (ZVS)
Up to 600kHz Operating Frequency
High Gate-Driving Current +500 mA/-1000 mA
Precise Adjustable Output Over-Voltage Protection (OVP)
Programmable Dead Time using a Resistor
Pulse skipping and burst operation for frequency limit (programmable) at lightload condition
Simple Remote on/off Control with Selectable Latch or A/R using FI or LS pin
Protection Function; Over-voltage protection (OVP), Overload Protection (OLP),
Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP),
Internal thermal shutdown (TSD) and High Precise Line Under-Voltage Lockout
(LUVLO)
Level-Change OCP Function During Startup.
SOP-16 Package
© 2016 Fairchild Semiconductor Corporation
3
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
2.5. General Description of FL3100T
The FL3100T 2 A gate driver is designed to drive an N-channel enhancement-mode
MOSFET in low-side switching applications by providing high peak current pulses
during the short switching intervals. The FL3100T has two inputs that can be configured
to operate in non-inverting (IN) mode with a DIM pin for PWM dimming control of the
LED Driver. High accuracy PWM dimming control required in smart LED drivers is
possible by adjusting the duty ratio of the DIM input. If one or both inputs are left
unconnected, internal resistors bias the inputs such that the output is pulled LOW to hold
the power MOSFET off.
The driver is available with fixed TTL input thresholds. Internal circuitry provides an
under-voltage lockout function by holding the output LOW until the supply voltage is
within operating range. The FL3100T delivers fast MOSFET switching performance,
which helps maximize efficiency in high-frequency LED driver designs.
2.6. Features










Variable Non-inverting Input Logic with DIM Control Input for PWM Dimming
down to 0.1% for Hybrid Dimming
4.5 to 18 V Operating Range
TTL Inputs Independent of Supply Voltage
2.5 A Sink / 1.8 A Source at VOUT = 6 V
Internal Resistors Turn Driver Off If No Inputs
13 ns Typical Rise Time and 9 ns Typical Fall-Time with 1 nF Load
MillerDrive™ Technology
Typical Propagation Delay Time Under 20 ns with Input Falling or Rising
6-Lead, 2 x 2 mm MLP or 5-Pin, SOT23 Packages
Rated from -40°C to 125°C Ambient
© 2016 Fairchild Semiconductor Corporation
4
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
3. Schematic
Figure 1.
© 2016 Fairchild Semiconductor Corporation
Schematic for Main PFC and LLC Stage
5
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Figure 2.
Schematic for 3-Channel DC-DC Buck LED Driver’s Power Stage
© 2016 Fairchild Semiconductor Corporation
6
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Figure 3.
Schmatic for 3-Channel DC-DC Buck LED Driver’s Control Stage
© 2016 Fairchild Semiconductor Corporation
7
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
4. Bill of Materials
No.
Part Reference
Part Value
Qty.
Description
Vendor
Fairchild
Semiconductor
1
BD1
GBU4J
1
Diode Bridge 600 V/4 A GBU
2
C33, C34, C35,C60
C0805C330J1GACTU
4
CAP 0805 NPO 100 V 33 pF ±5% Kemet
3
C36, C37, C38
885012007034
3
CAP 0805 100 PF 25 V NP0
Wurth
4
C19
885012207094
1
CAP 0805 0.022 µF 50 V X7R
Wurth
5
C1
885012207078
1
CAP 0805 X7R 25 V 1.0 µF ±10% Wurth
6
C9
885012207076
1
CAP 0805 X7R 25 V 0.47 µF
±10%
Wurth
7
C2, C11, C17, C44,
C45, C56
885012207098
6
CAP 0805 X7R 50 V 100 NF
±10%
Wurth
8
C15
885012207094
1
CAP 0.022 µF 50 V X7R 0805
Wurth
Wurth
9
C8
885012207096
1
CAP 0805 X7R 50 V 47NF ±10%
10
C10, C55
885012207092
2
CAP 0805 X7R 50 V 10 NF ±10% Wurth
11
C52
885012007051
1
CAP 10 PF 50 V NP0 0805
Wurth
12
C7
885012207093
1
CAP 0805 X7R 50 V 15NF ±10%
Wurth
13
C5, C6
885012207086
2
CAP 0805 X7R 50 V 1 NF ±10%
Wurth
Wurth
14
C3
885012207100
1
CAP 0805 X7R 50 V 220 NF
±10%
15
C16
C0805C562K5RACTU
1
CAP 0805 X7R 50 V 5N6 ±10%
Kemet
16
C18
C0805C822K5RACTU
1
CAP 0805 X7R 50 V 8N2 ±10%
Kemet
17
C12
885012208089
1
CAP 0.22 µF 50 V X7R 1206
Wurth
18
C13
C1206C100JBGACTU
1
CAP 1206 C0G 630 V 10 PF ±5% Kemet
19
C53, C62, C63, C64
885012206056
4
CAP 0603 330 PF 25 V X7R
Wurth
20
C4, C21, C23, C24,
C26, C27, C28, C29,
C42, C43, C46, C54
885012206095
12
CAP 0603 0.1 µF 50 V X7R
Wurth
21
C51
885012206083
1
CAP 0603 1 nF 50 V X7R
Wurth
22
C47, C48, C49
885012206076
3
CAP 0603 1 µF 25 V X7R
Wurth
23
C39, C40, C41, C61
CL31B225KCHSNNE
4
CAP1206 2.2 µF 100 V X7R
Samsung
24
C20,C22,C25
885012206027
3
CAP 0603 2.2 µF 10 V X7R
Wurth
25
C30, C31, C32
26
C50
ESW226M100AG3AA
1
CAP DIP 22 µF 100V 8*11.5
RADIAL
Kemet
27
C14
B32672L8153J
1
CAP DIP 2000V/0.015 µF ±5%
P=15 MM
EPCOS / TDK
28
CB1
B32922C3334M
1
CAP DIP CL21X 630 V 0.33 µF
±10% P=15 MM (CBB)
EPCOS / TDK
29
EC3
10YXF100MEFC5X11
1
CAP ALUM 100 µF 20% 10 V
RADIAL
Wurth
30
EC6, EC7
UCY2E101MHD1TN
2
CAP ALUM 100 µF 20% 250 V
RADIAL
Nichicon
NC
© 2016 Fairchild Semiconductor Corporation
8
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Bill of Materials
No.
(Continued)
Part Reference
Part Value
Qty.
Description
Vendor
31
EC9
35ZLH100MEFC6.3X11
1
CAP ALUM 100 µF 20% 35 V
RADIAL
32
EC5
50YXF10MEFC5X11
1
CAP ALUM 10 µF 20% 50 V
RADIAL
33
EC1, EC12
50YXJ22MTA5X11
2
CAP DIP RUBYCON 50 V 22 µF
Rubicon
5*11
34
EC8, EC2, EC4
50YXF47MEFC6.3X11
3
CAP ALUM 47 µF 20% 50 V
RADIAL
Rubicon
35
EC10, EC11
UHE1J471MHD6
2
CAP ALUM 470 µF 20% 63 V
RADIA
Nichicon
36
CX2
890334025027CS
1
CAP DIP X2 AC310V 0.22 µF
±20% P=15 MM
Wurth
37
CX1
890334025039CS
1
CAP DIP X2 AC310V 0.47 µF
±20% P=15 MM
Wurth
38
CY3
C971U472MUWDBA7317
1
CAP DIP Y1 AC400V 4.7 nF
KEMET
39
CY1,CY2
CD70-B2GA221KYNKA
2
CAP DIP Y1 Y5P AC440V
220 PF
TDK
40
J2
877580616
1
CONN HEADER 6POS 2 MM
VERT GOLD
Molex, LLC
41
J1, J3
FTSH-105-01-F-DV-K
2
CONN HEADER 10POS
DUAL .05" SMD
Samtec Inc.
42
J4
691 412 120 006 MB
1
TERM BLOCK PCB 6POS
3.5 MM GREEN 300 V 2 A 1624 AWG
Wurth
43
J5
OSTTE031104
1
TERMINAL BLOCK 7 MM VERT
On Shore
3POS PCB 125 V 10 A 16-26
Technology Inc.
AWG
47
D7
UF4004
1
DIODE DIP Fairchild UF4004
400 V/1 A DO-41
Fairchild
Semiconductor
48
D14
SB3100
1
DIODE Fairchild SB3100
100 V/3 A DO-201AD
Fairchild
Semiconductor
49
D20, D21, D22
CDBM1100-G
3
DIODE SCHOTTKY 100 V 1 A
Vf:0.85 V CDBM1100-G
Comchip
Technology
50
D1, D6, D13
ES1D
3
DIODE SMD Fairchild ES1D
200 V/1 A DO-214AC
Fairchild
Semiconductor
51
D5
ES3J
1
DIODE SMD Fairchild ES3J
600 V/3 A DO-214AB
Fairchild
Semiconductor
52
D3,D9, D10, D11,
D12, D23
LL4148
6
DIODE SMD Fairchild LL4148
100 V/0.2 A SOD80
Fairchild
Semiconductor
53
D8
SS25
1
DIODE SMD Fairchild SS25
50 V/2 A DO-214AA
Fairchild
Semiconductor
54
D15, D16
MBR20150CTTU
2
DIODES DIP MBR20150CT
150 V/20 A TO-220
Fairchild
Semiconductor
55
D17, D18, D19
BAT54S
3
DIODE ARRAY SCHOTTKY
30 V SOT23-3
Fairchild
Semiconductor
56
D4
ES2J
1
DIODE SMD Fairchild 600 V/2 A Fairchild
DO-214AA
Semiconductor
57
F1
0698Q2000-02
1
Tape Box, AC350V T2.0A
© 2016 Fairchild Semiconductor Corporation
9
Rubicon
Rubicon
Bel Fuse Inc.
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Bill of Materials
No.
(Continued)
Part Reference
Part Value
Qty.
Description
Vendor
58
U5
ATSAMD21G18A-MU
1
Atmel 32bit RISC MCU 48 pin
ATSAMD21G18A-MU QFN48
59
U4, U13
KA431SMFTF
2
IC (TL431)Fairchild
KA431SMFTF(43a) SOT-23F
Fairchild
Semiconductor
60
U11
KA7815ETU
1
IC DIP Fairchild KA7815 TO-220
'Fairchild
Semiconductor
61
U3
LM2591HVT-3.3/NOPB
1
IC DIP TI LM2591HVT3.3/NOPB TO-220-5
TI
62
U2
FAN7631SJX
1
IC SMD FAN7631SJX Fairchild
SOP-16
Fairchild
Semiconductor
63
U1
FL7930CMX_G
1
IC SMD FL7930C Fairchild
SOP-8
Fairchild
Semiconductor
64
U7, U8, U9
FL3100TSX
3
Low Side Mosfet Driver Fairchild FL3100TSX SOT23-5
Fairchild
Semiconductor
65
U10
TLV3201AIDBV
1
TLV3201AIDBV SOT23-5 TI
TI
66
L4, L5
74279263
2
FERRITE BEAD 220  .5 A
Würth Elektronik
0603 74279263 Würth Elektronik
67
L3, L6, L7
CDRH127/LDNP-330MC
3
FIXED IND 33 µH 3.9 A 53.3 M
Sumida
CDRH127/LDNP-330 MC
Sumida
68
L8
750315757
1
INDUCTOR DIP RM6 TDK
PC44 LP=300 µH ±5%
Wurth
69
L1
750315759
1
INDUCTOR DIP RM8 TDK
PC44 LP=550 µH ±5%
Wurth
70
LF1
TLF-1609MV-203
1
INDUCTOR DIP T16*9.5*5 20
MH P=6 MM
T&I Tech
71
LF2
CH613400SFB
1
INDUCTOR DIP T18*10*7
50 MH P=20 MM
TNC
www.tncltd.com
72
L2
74404064330
1
INDUCTOR SMD TDK CLF6045
Wurth
33 µH ±20% IDC=1.07~1.5 A
73
Q9
FQN1N50CTA
1
MOSFET N-CH 500 V 380 MA
TO-92
Fairchild
Semiconductor
74
Q6, Q7, Q8
FQU13N10LTU
3
MOSFET FQU13N10LTU TO251
Fairchild
Semiconductor
75
Q4, Q5
FCPF11N60F
2
MOSFET Fairchild
FCPF11N60F TO-220
Fairchild
Semiconductor
76
Q2,
FCPF600N60Z
1
FCPF600N60Z TO-220F
Fairchild
Semiconductor
77
RT1
B57237S259M
1
RES DIP NTC 2.5D-11
EPCOS/TDK
78
U6, U12
TCLT1008CT-ND
2
Opto-coupler SMD CTR=1.3~2.6 Vishay
80
R9
NKN2WSJT-73-0R2
1
RES DIP 2 W 0.2R±5%
© 2016 Fairchild Semiconductor Corporation
10
Atmel
Yageo
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Bill of Materials
No.
(Continued)
Part Reference
Part Value
Qty.
Description
Vendor
81
R59, R60, R61
RL1632R-R180-F
3
RES '0.18R ±1% 0.5 W,1206
RL1632R-R180-F Susumu
Susumu
82
R25
RC0805JR-071K2L
1
RES 1.2 K 5% 0805 SMD
Yageo
83
R44, R72, R74, R86
RC0603FR-0734k8L
4
RES SMD 34.8 K 1% 1/10 W
0603
Yageo
84
R7, R24
RC0805JR-0710RL
2
RES 10  5% 0805 SMD
Yageo
85
R91
RC0603FR-07100RL
1
RES 100 K 1/10 W 1% 0603
SMD
Yageo
86
R20
RC0805JR-07100KL
1
RES 100 K 5% 0805 SMD
Yageo
87
R69, R70, R71, R87
RC0603FR-072M21L
4
RES SMD 2.21 M 1% 1/10 W
0603
Yageo
88
R1, R8, R30, R31
RC0805JR-0710KL
4
RES 10 K 5% 0805 SMD
Yageo
89
R22
RC0805JR-0713KL
1
RES 13 K 5% 0805 SMD
Yageo
90
R92
RC0805JR-07120KL
1
RES 120 K 5% 0805 SMD
Yageo
91
R45, R62, R75, R82,
RC0603FR-0710KL
R83, R85, R89, R90
8
RES 1 0K 1/10 W 1% 0603
SMD
Yageo
92
R6
RC0805JR-07150RL
1
RES 150 K 5% 0805 SMD
Yageo
93
R37, R38
RC1206JR-0718KL
2
RES 18 K 5% 1206 SMD
Yageo
94
R35, R46
RC0805JR-071KL
2
RES 1 K 5% 0805 SMD
Yageo
95
R29
RC1206JR-071KL
1
RES 1 K 5% 1206 SMD
Yageo
96
R43, R48, R50, R53,
R54, R55, R63, R64,
R65, R73, R77, R80,
R84,
RC0603FR-071KL
13
RES 1 K 1/10 W 1% 0603
SMD
Yageo
97
RX1, RX2, RX3
RC1206JR-071ML
3
RES 1 M 5% 1206 SMD
Yageo
98
R19
RC1206FR-071ML
1
RES 1 M 1/4 W 1% 1206 SMD Yageo
99
R66, R67, R68
RC0603FR-072.2KL
3
RES 2.2 K 1/10 W 1% 0603
SMD
Yageo
100
R17, R18
RC1206FR-072M2L
2
RES 2.2 M 1/4 W 1% 1206
SMD
Yageo
© 2016 Fairchild Semiconductor Corporation
11
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Bill of Materials
No.
(Continued)
Part Reference
Part Value
Qty.
Description
Vendor
101
R39
RC0805FR-072K7L
1
RES 2.7 K 1% 0805 SMD
Yageo
102
R47, R49
RC0603FR-0722KL
2
RES 22 K 1/10 W 1% 0603
SMD
Yageo
103
R21
RC0805JR-0724KL
1
RES 24 K 5% 0805 SMD
Yageo
104
R41, R4, R28
RC0805FR-0727KL
3
RES 27 K 1% 0805 SMD
Yageo
105
R5, R26, R27
RC0805JR-073R3L
3
RES 3.3  5% 0805 SMD
Yageo
106
R42
RC0805JR-073R3L
1
RES 3.3  5% 0805 SMD
Yageo
107
R2, R40
RC0805FR-0731k6L
2
RES 31.6 k 1% 0805 SMD
Yageo
108
R23, R34
RC0805JR-073KL
2
RES 3 K 5% 0805 SMD
Yageo
109
R12, R13, R14, R15
RC0805JR-074M3L
4
RES 4.3 M 5% 0805 SMD
Yageo
110
R3, R10
RC0805JR-074K7L
2
RES 4.7 K 5% 0805 SMD
Yageo
111
R36
RC0805JR-0743KL
1
RES 43 K 5% 0805 SMD
Yageo
112
R16
RC0805JR-0751KL
1
RES 51 K 5% 0805 SMD
Yageo
113
R32, R33
RC0805JR-0747KL
2
RES 47 K 5% 0805 SMD
Yageo
114
R94
RC0805FR-075K1L
1
RES 5.1 K 1% 0805 SMD
Yageo
115
R75, R78
RC0603FR-0724K9L
2
RES SMD 24.9 K 1% 1/10 W
0603
Yageo
116
R51, R52, R98, R99,
R100, R101
RC0603FR-0749K9L
6
RES SMD 49.9 K 1% 1/10 W
0603
Yageo
117
R79, R103
RC0603FR-071ML
2
RES SMD 1 M 1% 1/10 W
0603
Yageo
118
R102
47KWCT-ND
1
RES 47 K 1 W 5% AXIAL
Yageo
119
R81, R93, R95, R96,
R97, R104
RC1206FR-07330KL
6
RES SMD 330 K 1% 1206
Yageo
120
R11
RC0805JR-0791KL
1
RES 91 K 5% 0805 SMD
Yageo
121
R88
CRCW12060000Z0EAHP
1
RES SMD 0.0  JUMPER 1/2 W
Vishay
1206
© 2016 Fairchild Semiconductor Corporation
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RD-549_FAN7631 • Rev. 1.0
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Bill of Materials
No.
(Continued)
Part Reference
Part Value
Qty.
Description
Vendor
122
R56, R57, R58
RL0816S-2R2-F
3
RES SMD 2.2  1% 0603
Susumu
123
RT3, RT4
NTCS0805E3474JXT
4
NTC RES R25°C 470K ¢3 MM
Vishay
124
T1
750315879
1
EFD25 PC44 LP=1800 µH ±5%
Wurth
125
Q1, Q3
KSP2222ATA
2
PNP Transistor TO-92
Fairchild
Semiconductor
126
VZ1
MOV-10D561K
1
VARISTOR 10D561K P=7.5 MM Bourns
127
ZD2, ZD3
MMSZ5248B
2
ZENER DIODE 18 V 500 mW
SOD123
Fairchild
Semiconductor
128
ZD1
MMSZ5245B-15 V(H5)
1
ZENER DIODE 15 V 500 mW
SOD123
Fairchild
Semiconductor
5. Transformer Design
5.1. PFC Inductor

Core: RM8
Figure 4.
Transformer Pin assignment and Configuration
Figure 5.
© 2016 Fairchild Semiconductor Corporation
Winding Strucuture
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RD-549_FAN7631 • Rev. 1.0
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Table 1.
Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
NP
8 5
0.1*25
70 Ts
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
3
13
NS1
0.2φ
5 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
11  12
NS1
4
Table 2.
0.2φ
5 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Electrical Characteristics
Inductance
© 2016 Fairchild Semiconductor Corporation
Pin
Specifications
Remark
8–5
600 µH ±10%
50 kHz, 1 V
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RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
5.2. LLC Inductor

Core: RM6
Figure 6.
Transformer Pin Assignment and Configuration
Figure 7.
Table 3.
Winding Strucuture
Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
8 2
0.1*20
40 Ts
Solenoid Winding
2
Table 4.
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
Electrical Characteristics
Inductance
© 2016 Fairchild Semiconductor Corporation
Pin
Specifications
Remark
8–2
300 µH ± 5%
100 kHz, 1 V
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RD-549_FAN7631 • Rev. 1.0
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5.3. Transformer
 Core: EFD25
Figure 8.
Figure 9.
Table 5.
Transformer Pin Assignment and Configuration
Winding Specifications
No.
Winding
Pin (S → F)
Wire
Turns
Winding Method
1
N1
21
0.3φ
48 Ts
Solenoid Winding
2
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
3
NA
AB
0.3φ TIW
24 Ts
Solenoid Winding
4
NA
BC
0.3φ TIW
24 Ts
Solenoid Winding
5
6
Insulation: Polyester Tape t = 0.025 mm, 2-Layer
13
N2
7
8
10
0.3φ
48 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
EF
N5
9
0.2φ TIW
9 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
45
N3
11
Table 6.
Winding Strucuture
0.2φ
9 Ts
Solenoid Winding
Insulation: Polyester Tape t = 0.025 mm, 3-Layer
Electrical Characteristics
Inductance [Lp]
© 2016 Fairchild Semiconductor Corporation
Pin
Specifications
Remark
2–3
1.8 mH
100 kHz, 1 V
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RD-549_FAN7631 • Rev. 1.0
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6. Performance
6.1. System Efficiency
System efficiency shown in Figure 10 is measured at 90 ~ 140 VAC [low line, 60 Hz] and
230 ~ 300 VAC [high line, 50 Hz] input voltage ranges. The results are for PFC and LLC
converters which 3 LED channels can be connected and measured in the rated load
condition [56 V / 1.1 A] after 30 minutes since AC power was turned on.
Figure 10.
© 2016 Fairchild Semiconductor Corporation
System Efficiency
17
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
System efficiency shown in Figure 11 is measured at 120 VAC [low line, 60 Hz] and
230 VAC [high line, 50 Hz] according to load conditions.
Figure 11.
© 2016 Fairchild Semiconductor Corporation
System Efficiency
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RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
6.2. Power Factor and THD
Power Factor shown in Figure 12 is measured at 90 ~ 140 VAC [low line, 60 Hz] and 230
~ 300 VAC [high line, 50 Hz] input voltage ranges. The measured data were results for
overall system when two channel LED loads were connected.
Figure 12.
© 2016 Fairchild Semiconductor Corporation
Power Factor & Total Harmonic Distortion
19
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
Total Harmonics Distortion, THD shown in Figure 13 is measured at 90 ~ 140 VAC [low
line, 60 Hz] and 230 ~ 300 VAC [high line, 50 Hz] input voltage ranges. The measured
data were results for overall system which two channel LED loads were connected.
Figure 13.
© 2016 Fairchild Semiconductor Corporation
Total Harmonic Distortion
20
RD-549_FAN7631 • Rev. 1.0
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Figure 14 shows dimming characteristic curve controlled by amplitude signal.
700
600
LED current [mA]
500
400
300
200
100
0
0%
10%
25%
40%
55%
70%
85%
100%
Analog Dimming Level [%]
Figure 14.
Analog Dimming Characteristics
Figure 15 shows dimming characteristic curve controlled by PWM signal.
100%
90%
Percentat Max LED current [%]
80%
70%
60%
50%
40%
30%
20%
10%
0%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
PWM Dimming Duty Cycle [%]
Figure 15.
© 2016 Fairchild Semiconductor Corporation
PWM Characteristics
21
RD-549_FAN7631 • Rev. 1.0
www.fairchildsemi.com
7. Revision History
Rev.
Date
Description
1.0
Mar. 2016
Initial Release
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with instructions for use provided in the labeling, can be reasonably
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2. A critical component is any component of a life support device or
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cause the failure of the life support device or system, or to affect its
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Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fairchild's Anti-Counterfeiting Policy is also stated on our external website,
www.fairchildsemi.com, under Sales Support.
Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing
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protect ourselves and our customers from the proliferation of counterfeit parts. Fairchild strongly encourages customers to purchase Fairchild parts
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either from Fairchild directly or from Authorized Fairchild Distributors are genuine parts, have full traceability, meet Fairchild's quality standards for
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© 2016 Fairchild Semiconductor Corporation
22
RD-549_FAN7631 • Rev. 1.0