Transformer Selection (T)

Figure 13 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.

Applications

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Transformers

T7

T7

T7

T6

T6

T5

V

IN

4V–6V

4V–6V

8V–16V

4V–6V

18V–36V

18V–36V

V

OUT1

3.3V

5V

12V

12V

12V

5V

I

1.4A

1A

0.8A

0.15A

0.6A

1.8A

N

1

1

1

1

1.2

1.2

0.5

V

OUT2

−12V

−12V

12V

I

0.15A

0.6A

0.25A

N

2

1.2

1.2

1.15

V

OUT3

−12V

I

0.25A

N

3

1.15

FIGURE 13. Transformer Selection Table

Trans-

former

Type

Manufacturers’ Part Numbers

Coilcraft

Coilcraft

Pulse

Pulse

Renco

Schott

(Note 15)

(Note 15)

(Note 16)

(Note 16)

(Note 17)

(Note 18)

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

Note 15: Coilcraft Inc.

Phone: (800) 322-2645

1102 Silver Lake Road, Cary, IL 60013:

Fax: (708) 639-1469

Note 16: Pulse Engineering Inc.

Phone: (619) 674-8100

12220 World Trade Drive, San Diego, CA 92128:

Fax: (619) 674-8262

Note 17: Renco Electronics Inc.

Phone: (800) 645-5828

60 Jeffryn Blvd. East, Deer Park, NY 11729:

Fax: (516) 586-5562

Note 18: Schott Corp.

Phone: (612) 475-1173

1000 Parkers Lane Road, Wayzata, MN 55391:

Fax: (612) 475-1786

FIGURE 14. Transformer Manufacturer Guide

www.national.com

14