Coupled Inductors - Coilcraft lnc
Description
Document 704-1
Coupled Inductors – MSD1278T
For high temperature SEPIC applications
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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 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 S...
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