MSD1278-472ML Datasheet, PDF (1/3 Pages) Coilcraft lnc. – Coupled Inductors for SEPIC

Document 499-1
Coupled Inductors–MSD1278 ForSEPICandother
Applications
The excellent coupling coefficient (k ≥ 0.94) makes the
MSD1278 series of coupled inductors ideal for use in
SEPIC applications. In SEPIC topologies, the required
inductance for each winding in a coupled inductor is
half the value needed for two separate inductors, allow-
ing 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 a VRM
inductors in high-current DC-DC converters 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.
01.428,34max
01.428,34max
123
X
Dot indicates pin1
Dash number
Internal code
Parts manufactured
prior to Sept. 2007
were marked with
only the dash number.
0.317
8,05
max
0.197
5,0
0.197
5,0
34
21
0.138
3,5
0.059
1,5
Dimensions are in
inches
mm
Recommended
Land Pattern
0.157
4,0
0.217
5,5
2 1 _0.177
3 4 ^4,5
0.079
2,0
1
2
L1
L2
3
4
D1
+
+
L1
C1
V_IN
Q1
+
L2
C2
Load ^VOUT
–
–
Typical SEPIC schematic
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
Designer’s Kit C400 contains 3 each of all values.
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 +85°C with Irms current, +85°C to
+125°C with derated current
Storage temperature Component: –40°C to +125°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 499-1 Revised 10/08/08
© Coilcraft, Inc. 2010