Document 293 -1

CCFL Transformers
The FL Series of transformers is designed for use incold cathode fluorescent lamp (CCFL) power supplies at
operating frequencies up to 100 kHz. With output powerfrom 3.5 to 6.0 Watts, these transformers are ideal for
LCD backlight applications. They are available in two

different gull wing, surface mount packages and one inboard configuration for height restricted designs.
Free evaluation samples are available by contacting
Coilcraft or ordering them on-line at www.coilcraft.com.

Turns ratio
Vrms3	 Vinst max4
Part 			Output Inductance2Imax
number1 Schematic Package pri : sec 	 pri : fb(Watts) nom (µH) sec (mA) pri		 secpri		 secFL2015-1L_B
1
1 : 67
1 : 0.19
6.043
5.022 1600
25.0 2000
FL2015-2L_A
1
1 : 67
1 : 0.19
6.0
43
5.0
23 1600
29.0 2000
FL2015-3L_A
1
1 : 100
1 : 0.25
6.019
5.016 1600
20.0 2000
FL2015-4L_A
1
1 : 50
1 : 0.14
6.044
7.032 1600
40.0 2000
FL2015-5L_A
1
1 : 125
1 : 0.38
6.020
7.012 1600
16.0 2000
FL2015-6L_B
1
1 : 67
1 : 0.196.048
11.0
23 1600
29.0 2000
FL2015-7L_A
1
1 : 67
1 : 0.19
6.050
11.0
23 1600
29.0 2000
FL2015-8L_A
1
1 : 86
1 : 0.21
6.0
31
11.0
18 1600
23.0 2000
FL2015-9L_A1
1 : 100
1 : 0.25
6.0
22
11.0
16 1600
20.0 2000
FL2015-10L_A
1
1 : 93
1 : 0.25
4.5
40
11.0
17 1600
21.0 2000
FL3209-1L, FL3209-3L Not recommended for new designs. Order FL3209-5L, which is electrically equivalent.
FL3209-2L, FL3209-4L Not recommended for new designs. Order FL3209-6L, which is electrically equivalent.
FL3209-5L_C
51 : 100	  
—
3.548
5.0
16 1600
20.0 2000
FL3209-6L_
D
51 : 93
1 : 0.17
3.540
5.017 1600
21.0 2000
FL2810-1L_C
41 : 100	  —
4.535
7.015 1500
16.5 1650

DCR max (Ohms)
pri
sec
fb
0.220 285 0.10
0.220 285 0.10
0.190 285 0.10
0.220 165 0.10
0.160 330 0.10
0.160 176 0.10
0.160 176 0.10
0.132 176 0.10
0.132 176 0.10
0.175 675 0.05

0.350
0.400
0.220362	  —
800 0.08500	  —Isolation (tested for one minute)

1. When ordering, please specify a packaging code:
FL2810-1LD
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape. Quantities less than full reel available: in tape(not machine ready) or with leader and trailer ($25charge).			 Package 1: 400 parts per full reel.
Package 4: 750 parts per full reel.
Package 5: 1000 parts per full reel.
B = Less than full reel. In an effort to simplify our partnumbering system, Coilcraft is eliminating the needfor multiple packaging codes. When ordering, simply
change the last letter of your part number from B to D.
2. Inductance is measured across both halves of the primary.
3. Vrms = continuous voltage.
4. Vinst = instantaneous voltage at startup.
5. Ambient temperature range: −40°C to +85°C.
Storage temperature range: Component: –40°C to +85°C
Tape and reel packaging: –40°C to +80°C
6. Electrical specifications at 25°C.

PartPrimary tonumber
secondaryFL20151500 Vrms
FL3209	  500 Vrms
FL28101500 Vrms

Primary tofeedback
500 Vrms
500 Vrms—All windings
to core1500 Vrms
1500 Vrms
1500 Vrms

Note: For Schematic B, primary is connected to secondary at pin 3.
The primary is not isolated from the secondary.

Schematics
A1

B

Primary 3
52Feedback
4For Royer
topology

189

Secondary52

Primary 3

94

For Royer
topology

6

Primary 3
Secondary

4Feedback262

Primary 3
SecondaryDC
3

7For full-bridge
topology

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Secondary41Feedback

75

For Royer
topology
Document 293-1

Revised 09/13/11© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 293 -2

CCFL Transformers
Package 1
0.310
max
7,87
1

100.044
1,130.004/0,100.975
min
24,770.965 max
24,510.825
max
20,960.028 typ
0,70

1

100.610max
15,490.075
min
1,91

7

Recommended
Land Pattern0.098 cen
2,50

70.0501,2761060.098 cen
2,50

1

Weight:5.5 – 6.1 gTerminations: Tin-silver over tin over nickel over phos-bronze
Tape and reel: 400/13″ reel 44 mm tape width
For packaging data see Tape and Reel Specifications section.

Package 40.205 max
5,21

9

1

0.004/0,10

0.037
0,93
1.275
max
32,39

0.028
0,70
9

1.295
32,89

1.100
27,95
10.063
cen
1,60

1.163
29,54

0.120
3,050.066
min
1,68

6

7

0.402 max
10,21

CL

Recommended
Land Pattern

760.020
(7×)
0,50

0.120
3,05

90.0571,450.1574,00
0.157
4,00

10.030 (8×)
0,760.063 (3×)
1,60Weight:
3.6 g
Terminations: Tin-silver over tin over nickel over phos-bronze
Tape and reel: 750/13″ reel 44 mm tape width
For packaging data see Tape and Reel Specifications section.

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 293-2

Revised 09/13/11© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 293 -3

CCFL Transformers
Package 5 – In-board mounting
Dot indicates pin 10.016
typ0,40
8

18

Recommended
Land Pattern

0.020
0,51
1Minimum PCB cutout

0.366 max
9,30

0.382 × 1.173
9,70 × 29,80

760.225 max
5,72 70.063 cen
1,60

70.137
min
3,48

61.440min
36,58

0.150 max
3,81

61.16529,60

0.063 cen
1,60In-board Mounting

1.439 max
36,55

Weight:3.8 – 4.0 g
Terminations: Tin-silver over tin over copper over copper-steel
Tape and reel: 1000/13″ reel 56 mm tape width
For packaging data see Tape and Reel Specifications section.

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 293-3

Revised 09/13/11© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.