C1587-AL Datasheet, PDF (1/1 Pages) Coilcraft lnc. – Flyback Transformers

Document 458
Flyback Transformers ForNationalSemiconductor
LM5070 PoE Interface – 7 Watt
• Flyback transformers for 7 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 over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 3.85 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°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: 32 mm wide, 0.5 mm
thick, 24 mm pocket spacing, 11.2 mm pocket depth
PCB washing Only pure water or alcohol recommended
Inductance
Part
at 0 A²
number¹ ±10% (µH)
C1587-AL_
155
C1588-AL_
155
C1589-AL_
155
Inductance
at Ipk³
min (µH)
139.5
139.5
139.5
DCR max (Ohms)⁴
pri bias sec
0.414 0.822 0.036
0.414 0.822 0.060
0.414 0.822 0.343
Leakage
inductance
max (µH)⁵
4.00
3.60
3.25
Turns ratio⁶
pri : sec pri : bias
1 : 0.19
1 : 0.262
1 : 0.667
1 : 0.667
1 : 0.667
1 : 0.667
Ipk³
(A) Output⁷
0.65 3.3 V, 2.12 A
0.65 5.0 V, 1.4 A
0.65 12 V, 0.6 A
1. When ordering, please specify packaging code:
C1589-ALD
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.
Dot above pin1
2. Inductance is for the primary, measured at 10 kHz, 0.1 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.
0.433
11,00
max
0.041
1,05
1
0.50
12,7
max
4
0.600
15,24
max
0.413
10,50
0.004 /0,10
0.024
0,60
8
0.080
2,03
Recommended
Land Pattern
0.460
11,68
0.050
1,27
3
Pri
4
2
Bias
6
5
Sec
7
8
5
0.098
2,50
1
Dimensions are in
inches
mm
0.098
2,50
1
Secondary windings to be connected
in parallel on the PC board
Specifications subject to change without notice.
Please check our website for latest information.
Document 458 Revised 10/29/08
© Coilcraft, Inc. 2009