Document 509
Flyback Transformer
For TI LM5071 & LM5072
PD Controllers
• Dual-output flyback transformer for Power over Ethernet
• Operates in continuous mode at 250 kHz with 14 – 60 V input
• 2000 Vrms isolation from primary and auxiliary to secondaries
Core material
Ferrite
Terminations
RoHS compliant tin-silver over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight
6.35g
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
Part
number
1
DA2257-AL_
L at 0 A
2
±10% (µH)
35.0
L at
Ipk
3
min (µH)
30.0
DCR max
(Ohms)
0.225 (aux)
0.138 (gate)
0.010 (sec 1)
0.018 (sec 2)
0.062 (pri)
Leakage L
4
max (µH)
0.95
Turns
ratios
2
:
1 (pri
:
aux)
3.6
:
1 (pri
:
gate)
6
:
1 (pri
:
sec1)
3.6
:
1 (pri
:
sec 2)
Ipk
3
(A)
2.7
Outputs
10 V, 0.05 A (aux)
5.5 V, 0.05 A (gate)
3.3 V, 2.0 A (sec 1)
5.0 V, 1.0 A (sec 2)
1. When ordering, please specify
packaging
code:
Packaging:
DA2257-ALD
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.
Dot above pin1
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. Leakage inductance is for the primary winding with all other pins
shorted.
5. Electrical specifications at 25°C.
9
5
Gate
8
Sec 1
7
10
Sec 2
6
Pri
4
0.004 /0,10
0.500 max
12,70
0.039
1,00
1
Aux
0.699 max
17,75
0.512
13,00
5
0.028
0,70
6
0.061
1,55
1
0.590
14,99
0.050
1,27
2
0.530 max
13,46
1
10
Recommended
Land Pattern
0.098
2,50
Dimensions are in
inches
mm
0.098
2,50
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 509
Revised 10/29/08
© Coilcraft Inc. 2014
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.
