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MSD1278T-562ML

Description
Coupled Inductors
File Size230KB,3 Pages
ManufacturerCOILCRAFT
Websitehttp://www.coilcraft.com/
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MSD1278T-562ML Overview

Coupled Inductors

Document 704-1
Coupled Inductors – MSD1278T
For high temperature
SEPIC applications
The MSD1278T series of coupled inductors was de-
signed for high temperature applications – up to 125°C.
The excellent coupling coefficient (k
0.94) makes it
ideal for use in SEPIC applications. In SEPIC topolo-
gies, the required inductance for each winding in a
coupled inductor is half the value needed for two sepa-
rate inductors, allowing selection of a part with lower
DCR and higher current handling.
These inductors provide high inductance, high effi-
ciency and excellent current handling in a rugged, low
cost part. They are well suited for use as VRM induc-
tors in high-current DC-DC and VRM/VRD controllers.
They can also be used as two single inductors con-
nected in series or parallel, as a common mode choke
or as a 1 : 1 transformer.
0.484
max
12,3
D1
+
L1
C1
Dot indicates pin1
Dash number
Internal code
+
+
V
OUT
0.484
max
12,3
123
X
V
IN
Q1
L2
C2
Load
Typical SEPIC schematic
0.308 ±0.010
7,8 ±0,25
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
Recommended
Land Pattern
0.197
5,0
0.138
3,5
0.197
5,0
3
2
4
1
0.217
5,5
0.157
4,0
2
3
0.177
4,5
4
1
0.059
1,5
0.079
2,0
Dimensions are in
inches
mm
1
L1
3
2
L2
4
Core material
Ferrite
Terminations
RoHS compliant matte tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight:
3.7 – 4.4 g
Ambient temperature
–40°C to +125°C with
Irms
current, +125°C
to +165°C with derated current
Storage temperature
Component: –40°C to +165°C.
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
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
500/13″ reel; Plastic tape: 24 mm wide, 0.4 mm thick,
16 mm pocket spacing, 8.1 mm pocket depth
PCB washing
Only pure water or alcohol recommended
Specifications subject to change without notice.
Please check our website for latest information.
Document 704-1
Revised 08/31/09
© Coilcraft, Inc. 2010
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