Coupled Inductors
Document 704-1
Coupled Inductors – MSD1278T
For high temperature SEPIC applications
www.DataSheet4U.com
The MSD1278T...
Description
Document 704-1
Coupled Inductors – MSD1278T
For high temperature SEPIC applications
www.DataSheet4U.com
The MSD1278T series of coupled inductors was designed 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 topologies, the required inductance for each winding in a coupled inductor is half the value needed for two separate inductors, allowing selection of a part with lower DCR and higher current handling. These inductors provide high inductance, high efficiency and excellent current handling in a rugged, low cost part. They are well suited for use as VRM inductors in high-current DC-DC and VRM/VRD controllers. They can also be used as two single inductors connected 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
+ +
VOUT
0.484 max 12,3
123 X
VIN
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 1 4
0.177 4,5
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 wi...
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