LM2585

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SNVS120F – APRIL 2000 – REVISED APRIL 2013

TRANSFORMER SELECTION (T)

Table 1 lists the standard transformers available for flyback regulator applications. Included in the table are the

turns ratio(s) for each transformer, as well as the output voltages, input voltage ranges, and the maximum load

currents for each circuit.

Table 1. Transformer Selection Table

Applications

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Transformers

T7

T7

T7

T6

T6

T5

4V–6V

4V–6V

8V–16V

4V–6V

18V–36V

18V–36V

3.3V

5V

12V

12V

12V

5V

1.4A

1A

0.8A

0.15A

0.6A

1.8A

1

1

1

1.2

1.2

0.5

−12V

−12V

12V

0.15A

0.6A

0.25A

1.2

1.2

1.15

−12V

0.25A

1.15

Table 2. Transformer Manufacturer Guide

Manufacturers' Part Numbers

Transform

Coilcraft

Pulse

Coilcraft

Pulse

Renco

Schott

er Type

(1)

(2)

(1)

(2)

(3)

(4)

Surface Mount

Surface Mount

T5

Q4338-B

Q4437-B

PE-68413

—

RL-5532

67140890

T6

Q4339-B

Q4438-B

PE-68414

—

RL-5533

67140900

T7

S6000-A

S6057-A

—

PE-68482

RL-5751

26606

(1)

Coilcraft Inc. Phone: (800) 322-2645 www.coilcraft.com

(2)

Pulse Engineering Inc. Phone: (619) 674-8100 www.digikey.com

(3)

Renco Electronics Inc. Phone: (800) 645-5828 www.cdiweb.com/renco

(4)

Schott Corp. Phone: (612) 475-1173 www.schottcorp.com/

TRANSFORMER FOOTPRINTS

Figure 30 through Figure 44 show the footprints of each transformer, listed in Table 1.

T7

T6

Figure 30. Coilcraft S6000-A

Figure 31. Coilcraft Q4339-B

(Top View)

(Top View)

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