Document 922-1
For SEPIC
Coupled Inductors
–
MSC1278 Applications
The MSC1278 coupled inductors are designed with
high leakage inductance for use in SEPIC applications.
The loosely coupled windings (K ≈ 0.8) improve SEPIC
efficiency by reducing circulating current and provide
twice the ripple current reduction of separate inductors.
These inductors offer high efficiency and excellent cur-
rent handling in a rugged, low cost part. They are well
suited for use as aVRM inductors in high-current DC-DC
converters and VRM/VRD controllers.
They can also be used as two single inductors connected
in series or parallel.
0.484
12,3
D1
max
+
+
L1
Q1
C1
Dot indicates pin1
Dash number
+
1 2 3
V
V
OUT
L2
C2
Load
IN
0.484
12,3
max
X
Internal code
–
–
Typical SEPIC schematic
Refer to Application Note, Document 639,
0.317
8,05
max
“Selecting Coupled Inductors for SEPIC Applications.”
Visit http://www.coilcraft.com/apps/sepic/selector_2.cfm
for the Coilcraft on-line SEPIC Inductor Selector tool.
Recommended
Land Pattern
0.217
5,5
0.197
5,0
Core material Ferrite
Core and winding loss Go to online calculator
0.157
4,0
0.138
3,5
Terminations RoHS compliant matte tin over nickel over phos
bronze. Other terminations available at additional cost.
2
3
1
4
3
4
1
0.197
5,0
0.177
4,5
Ambient temperature –40°C to +85°C with Irms current, +85°C to
+125°C with derated current
2
Storage temperature Component: –40°C to +125°C.
0.059
1,5
0.079
2,0
Tape and reel packaging: –40°C to +80°C
Winding to winding isolation 500 Vrms
Resistance to soldering heat Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
1
2
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
inches
mm
Dimensions are in
L1
L2
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
4
3
1 : 1
Packaging 500/13″ reel; Plastic tape: 24 mm wide, 0.4 mm thick,
16 mm pocket spacing, 8.1 mm pocket depth
PCB washing Tested with pure water or alcohol only. For other
solvents, see Doc787_PCB_Washing.pdf.
Document 922-1 Revised 06/24/11
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
© Coilcraft Inc. 2020
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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