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© Coilcraft Inc. 2013
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.
Flyback Transformers
Document 445
Document 445 Revised 10/29/08
For National Semiconductor
LM5070 PoE Interface – 13 Watt
Inductance Inductance Leakage
Part at 0 A2 at Ipk3 DCR max (Ohms)4 inductance Turns ratio6 Ipk3
number1 ±10% (µH) min (µH) pri bias sec max (µH)5 pri : sec pri : bias (A) Output7
C1495-AL_ 127 114.3 0.255 0.310 0.024 1.25 1 : 0.166 1 : 0.50 1.0 3.3 V, 4.0 A
C1585-AL_ 127 114.3 0.222 0.348 0.039 0.950 1 : 0.25 1 : 0.50 1.0 5.0 V, 2.6 A
C1586-AL_ 127 114.3 0.199 0.308 0.129 0.650 1 : 0.50 1 : 0.50 1.0 12 V, 1.08 A
1. When ordering, please specify packaging code:
C1586-ALD
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (175 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.
4
1
3
210
8
Bias
Pri Sec
7
9
2. Inductance is for the primary, measured at 250 kHz, 0.2 Vrms, 0 Adc.
3. Ipk is peak primary current drawn at minimum input voltage.
4. DCR for the secondary is per winding.
5. Leakage inductance measured between pins 3 and 4 with all other
pins shorted.
6. Turns ratio is with the secondary windings connected in parallel.
7. Output of the secondary is with the windings connected in parallel.
Bias winding output is 12 V, 20 mA.
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.080
2,03
1
0.500
12,70
0.530
13,46
0.039
1,00
0.512
13,00
0.699
17,75max
0.590
14,99
0.028
0,70
0.050
1,27
0.098
2,50
0.098
2,50
max
max
56
110
Recommended
Land Pattern
0.004 /0,10
Dot above pin1
Secondary windings to be connected
in parallel on the PC board
• Flyback transformers for 13 W PoE applications
• Designed to operate in continuous mode at 250 kHz with an
input of 36
–
72 Vdc
• 1500 Vrms isolation from primary and bias to secondary
Core material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 6.15 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
Tape and reel 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 175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick,
28 mm pocket spacing, 12.93 mm pocket depth
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf
Dimensions are in inches
mm
