Coilcraft GA3271-AL Flyback transformer Datasheet

Document 629
Flyback Transformer
For Maxim MAX5941B
PWM Controller
• Flyback transformer for 13 W PoE applications
• Designed to operate with 30 – 60 V input at 275 kHz
• 1500 Vrms isolation from primary to secondary windings
Core material Ferrite
Terminations RoHS tin-silver over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 5.5 g
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°C.
Packaging: –40°C to +80°C
Resistance to soldering heat Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging 200 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick,
28 mm pocket spacing, 9.6 mm pocket depth
PCB washing Only pure water or alcohol recommended
Inductance Inductance
DCR max (Ohms)4
Part
Power
at 0 A2
at Ipk3
number1
(W)
±10% (µH)
min (µH)
pri
sec
bias
GA3271-AL_
13
117.5
104.0
0.201 0.06
0.335
Leakage
Turns ratios6
inductance5
max (µH)
pri :sec pri :bias
0.815
1 : 0.457 1 : 0.571
Ipk3
(A)
Output7
1.0 12 V, 1.0 A
1. When ordering, please specify termination and packaging codes:
GA3271-ALD
Termination: L =RoHS tin-silver over tin over nickel over phos bronze.
Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37).
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic tape (200 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 for the primary, measured at 250 kHz, 0.1 Vrms.
3. Peak primary current drawn at minimum input voltage.
4. DCR for the primary and for the secondary are with the windings connected in parallel.
5. Leakage inductance is for the primary windings with the secondary windings shorted.
6. Turns ratios are with the primary the secondary windings connected in parallel.
7. Output of the secondary is with the windings connected in parallel. Bias winding output is 15 V, 20 mA.
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
1
2
Pri
11
12
Dot indicates pin 1
1
0.677 max
17,20
6
7
0.865 max
21,97
0.004 /0,10
0.135
3,43
1
0.665
16,88
0.079
2,01
0.693
17.60
Recommended
Land Pattern
Sec
10
GA3271-AL
0.340 max
8,64
8
7
6
5
12
0.098
2,5
12
0.590
14,98
0.028
0,72
6
7
1
12
Bias
3
Primary windings and secondary windings
to be connected in parallel on PC board.
0.07
1,79
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2009
Document 629
0.098
2,5
Revised 10/28/08
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