LM2587
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SNVS115D –APRIL 2000–REVISED APRIL 2013
Figure 29. Triple-Output Flyback Regulator
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
Transformers
VIN
Figure 24
T1
Figure 25
T1
Figure 26
T1
Figure 27
T2
Figure 28
T3
Figure 29
T4
4V–6V
3.3V
1.8A
1
4V–6V
5V
8V–16V
12V
4V–6V
12V
18V–36V
12V
18V–36V
5V
VOUT1
IOUT1 (Max)
N1
1.4A
1
1.2A
0.3A
2.5
1A
2.5A
0.35
1
0.8
VOUT2
−12V
0.3A
2.5
−12V
1A
12V
IOUT2 (Max)
N2
0.5A
0.8
0.8
VOUT3
−12V
0.5A
0.8
IOUT3 (Max)
N3
Table 2. Transformer Manufacturer Guide
Transformer
Type
Manufacturers' Part Numbers
(1)
(2)
Coilcraft(1)
Coilcraft
Pulse
Renco(3)
Schott(4)
Surface Mount
Q4435-B
Q4436-B
—
Surface Mount
PE-68411
T1
T2
T3
Q4434-B
Q4337-B
Q4343-B
RL-5530
RL-5531
RL-5534
67141450
67140860
67140920
PE-68412
PE-68421
(1) Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469
(2) Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262
(3) Renco Electronics Inc.,: Phone: (800) 645-582860 Jeffryn Blvd. East, Deer Park, NY 11729: Fax: (516) 586-5562
(4) Schott Corp.,: Phone: (612) 475-11731000 Parkers Lane Road, Wayzata, MN 55391: Fax: (612) 475-1786
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