C1048-AL

Document 452
SMT Power Transformer
For Linear Technology LT1725
Isolated Flyback Controller
• Can be used in isolated and non-isolated designs
• Operates with 36 – 72 Volts input; can be used for PoE.
• 1500 Vrms, one minute isolation between the primary and the
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 5.1 g
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°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 200 per 13″ reel Plastic tape: 44 mm wide,
0.35 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Leakage
Turns ratio
DCR max (Ohms)
L max5
Part L at 0 A2 L at Ipk3
Ipk3
1
4
number Power ±10% (µH) min (µH)
pri
sec bias
(µH)
pri : sec6 pri : bias(A)
C1048-AL_
13 W
94.0
84.6
0.210
0.01
1. When ordering, please specify packaging code:
C1048-ALD
Packaging:D =13″ machine ready reel. EIA-481 embossed plastic
tape (200 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, 0.3 Vrms, 0 Adc.
3. Peak primary current drawn at minimum input voltage.
1
Dot indicates pin 1
0.028
0,72
12
C1048-AL
0.677
max
17,20
3.9
Recommended
Land Pattern
12
0.07
1,79
0.335
max
8,51
0.590
14,98
0.693
17.60
5 V, 2 A
10
9
2
0.098
2,5
Primary
4
Secondary
11
12
6
7
0.865
max
21,97
1 : 0.12 1 : 0.47 1.2
4. DCR is for both windings of the secondary connected in parallel.
5. Leakage inductance is for the primary winding with the secondary windings shorted.
6. Turns ratio is with the secondary windings connected in parallel.
7. Output is with the secondary windings connected in parallel. Output of
the bias winding with a 15 V, 0.2 A.
8. Operating temperature range –40°C to +125°C.
9. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
XXXXY
6
0.079
2,01
1
0.098
2,5
0.453
Output7
0.135
3,43
0.665
16,88
Bias
1
Parts manufactured prior
to December 2011 may
be marked differently.
Secondary windings to be connected in
parallel on PC board
0.004 /0,10
Dimensions are in
inches
mm
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 452 Revised 12/21/11
© 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.
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