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© Coilcraft Inc. 2016

This product may not be used in medical or high

risk applications without prior Coilcraft approval.

Specification subject to change without notice.

Please check web site for latest information.

Document 293-1 Revised 09/13/11

CCFL Transformers

Document 293 -1

1. When ordering, please specify a

packaging code:

FL2810-1LD

Packaging: D = 13

″ machine ready reel. EIA-481 embossed plastic

tape.

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 tape, but not machine ready.

To have a leader and trailer added ($25 charge), use

code letter D instead.

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.

Part

Turns ratio

Imax

DCR max (Ohms)

pri :fb

(Watts)

nom (µH)

sec (mA) pri

sec

pri

sec

pri

sec

fb

FL2015-1L_

B

1

1

:67

1

:0.19

6.0

43

5.0

22

1600

25.0

2000 0.220

285 0.10

FL2015-2L_

A

1

1

:67

1

:0.19

6.0

43

5.0

23

1600

29.0

2000 0.220

285 0.10

FL2015-3L_

A

1

1

:100

1

:0.25

6.0

19

5.0

16

1600

20.0

2000 0.190

285 0.10

FL2015-4L_

A

1

1

:50

1

:0.14

6.0

44

7.0

32

1600

40.0

2000 0.220

165 0.10

FL2015-5L_

A

1

1

:125

1

:0.38

6.0

20

7.0

12

1600

16.0

2000 0.160

330 0.10

FL2015-6L_

B

1

1

:67

1

:0.19

6.0

48

11.0

23

1600

29.0

2000 0.160

176 0.10

FL2015-7L_

A

1

1

:67

1

:0.19

6.0

50

11.0

23

1600

29.0

2000 0.160

176 0.10

FL2015-8L_

A

1

1

:86

1

:0.21

6.0

31

11.0

18

1600

23.0

2000 0.132

176 0.10

FL2015-9L_

A

1

1

:100

1

:0.25

6.0

22

11.0

16

1600

20.0

2000 0.132

176 0.10

FL2015-10L_

A

1

1

:93

1

:0.25

4.5

40

11.0

17

1600

21.0

2000 0.175

675 0.05

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

5

1

:100

—

3.5

48

5.0

16

1600

20.0

2000 0.350

362

—

FL3209-6L_

D

5

1

:93

1

:0.17

3.5

40

5.0

17

1600

21.0

2000 0.400

800 0.08

FL2810-1L_

C

4

1

:100

—

4.5

35

7.0

15

1500

16.5

1650 0.220

500

—

C

2

3

6

4

7

Primary

Secondary

2

1

A

3

5

8

4

9

Primary

Secondary

Feedback

Primary

Secondary

Feedback

B

2

1

3

5

3

4

9

D

1

2

3

4

6

5

7

Primary

Secondary

Feedback

Schematics

The FL Series of transformers is designed for use in

cold cathode fluorescent lamp (CCFL) power supplies at

operating frequencies up to 100 kHz. With output power

from 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 in-

board configuration for height restricted designs.

Free evaluation samples are available by contacting

Coilcraft or ordering them on-line at

www.coilcraft.com.

For Royer

For Royer

For full-bridge

For Royer

topology

topology

topology

topology

Part

Primary to

Primary to

All windings

number

secondary

feedback

to core

FL2015

1500 Vrms

500 Vrms

1500 Vrms

FL3209

500 Vrms

500 Vrms

1500 Vrms

FL2810

1500 Vrms

—

1500 Vrms

Note: For Schematic B, primary is connected to secondary at pin 3.

The primary is not isolated from the secondary.