Coilcraft MSD1278-683ML Coupled inductors for sepic Datasheet

Document 499-1
Coupled Inductors–MSD1278
For SEPIC and other
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, 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 a VRM
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, as a common mode choke
or as a 1 : 1 transformer.
0.484
max
12,3
D1
+
+
L1
0.484
max
12,3
123
X
C1
Dot indicates pin1
Parts manufactured
prior to Sept. 2007
were marked with
only the dash number.
Dash number
Internal code
VIN
L2
Q1
C2
+
Load
–
VOUT
–
Typical SEPIC schematic
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
0.317
max
8,05
Recommended
Land Pattern
0.217
5,5
0.197
5,0
0.138
3,5
0.197
5,0
0.157
4,0
3
4
2
1
2
1
3
4
0.059
1,5
Dimensions are in
inches
mm
0.177
4,5
0.079
2,0
1
L1
3
2
L2
4
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.
© Coilcraft, Inc. 2010
Document 499-1
Revised 10/08/08
Document 499-2
Coupled Inductors for SEPIC – MSD1278 Series
SRF typ4
(MHz)
Isat5
(A)
Irms (A)
both
one
windings6
winding7
Part
number1
Inductance2
(µH)
DCR max3
(Ohms)
MSD1278-472ML_
MSD1278-562ML_
MSD1278-682ML_
MSD1278-822ML_
MSD1278-103ML_
4.7 ±20%
5.6 ±20%
6.8 ±20%
8.2 ±20%
10 ±20%
0.038
0.046
0.048
0.050
0.058
32.0
25.0
24.0
18.0
16.5
14.9
13.4
13.1
10.8
10.5
3.16
2.87
2.81
2.76
2.56
4.47
4.06
3.98
3.90
3.62
MSD1278-123ML_
MSD1278-153ML_
MSD1278-183ML_
MSD1278-223ML_
12
15
18
22
±20%
±20%
±20%
±20%
0.062
0.072
0.080
0.096
14.5
11.8
10.5
9.0
9.6
9.1
8.0
6.8
2.48
2.30
2.18
1.99
3.50
3.25
3.08
2.81
MSD1278-273ML_
MSD1278-333ML_
MSD1278-393ML_
MSD1278-473ML_
MSD1278-563ML_
27
33
39
47
56
±20%
±20%
±20%
±20%
±20%
0.120
0.150
0.160
0.180
0.190
8.4
7.6
6.5
6.0
5.6
6.5
5.6
5.5
5.2
4.5
1.78
1.59
1.54
1.45
1.41
2.52
2.25
2.18
2.05
2.00
MSD1278-683ML_
MSD1278-823ML_
MSD1278-104ML_
MSD1278-124KL_
MSD1278-154KL_
68
82
100
120
150
±20%
±20%
±20%
±10%
±10%
0.210
0.280
0.300
0.410
0.460
5.0
4.1
3.6
3.2
3.0
4.1
3.8
3.4
3.2
2.8
1.35
1.16
1.13
0.96
0.91
1.90
1.65
1.59
1.36
1.29
MSD1278-184KL_
MSD1278-224KL_
MSD1278-274KL_
MSD1278-334KL_
MSD1278-394KL_
180
220
270
330
390
±10%
±10%
±10%
±10%
±10%
0.510
0.690
0.900
1.02
1.12
2.7
2.5
2.1
2.0
1.8
2.5
2.3
2.1
1.9
1.7
0.86
0.74
0.65
0.61
0.58
1.22
1.05
0.92
0.86
0.82
MSD1278-474KL_
MSD1278-564KL_
MSD1278-684KL_
MSD1278-824KL_
MSD1278-105KL_
470
560
680
820
1000
±10%
±10%
±10%
±10%
±10%
1.43
1.69
2.29
2.55
2.83
1.6
1.5
1.4
1.3
1.1
1.6
1.5
1.3
1.2
1.1
0.50
0.47
0.41
0.39
0.37
0.70
0.67
0.58
0.55
0.52
Temperature rise calculation based on specified Irms
1. When ordering, please specify termination and packaging code:
MSD1278-105KLD
Termination: L = RoHS compliant matte tin over nickel over phos
bronze
Special order: T = RoHS tin-silver-copper (95.5/4/0.5)
or S = non-RoHS tin-lead (63/37).
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (500 parts per full reel).
B = Less than full reel. In tape, but not machine ready.
To have a leader and trailer added ($25 charge), use
code letter D instead.
2. Inductance shown for each winding, measured at 100 kHz, 0.1 Vrms, 0
Adc on an Agilent/HP 4284A LCR meter or equivalent. When leads are
connected in parallel, inductance is the same value. When leads are
connected in series, inductance is four times the value.
3. DCR is for each winding. When leads are connected in parallel, DCR is
half the value. When leads are connected in series, DCR is twice the
value.
4. SRF measured using an Agilent/HP 4191A or equivalent. When leads
are connected in parallel, SRF is the same value.
5. DC current, at which the inductance drops 30% (typ) from its value
without current. It is the sum of the current flowing in both windings.
6. Equal current when applied to each winding simultaneously that causes
a 40°C temperature rise from 25°C ambient. See temperature rise
calculation.
7. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
8. Electrical specifications at 25°C.
Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.”
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Winding power loss = (IL12 + IL22 ) × DCR in Watts (W)
52.6°C
Temperature rise (Δt) = Winding power loss ×
W
52.6°C
Δt = (IL12 + IL22 ) × DCR ×
W
Example 1. MSD1278-153ML (Equal current in each winding)
Winding power loss = (2.3 2 + 2.3 2) × 0.072 = 0.761 W
52.6°C
= 40°C
Δt = 0.761 W ×
W
Example 2. MSD1278-153ML (IL1 = 2.4 A, IL2 = 1.3 A)
Winding power loss = (2.4 2 + 1.3 2) × 0.072 = 0.536 W
Δt = 0.536 W ×
52.6°C
= 28.2°C
W
Coupled Inductor Core and Winding Loss Calculator
This web-based utility allows you to enter frequency, peak-to-peak (ripple)
current, and Irms current to predict temperature rise and overall losses,
including core loss. Visit www.coilcraft.com/coupledloss.
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2010
Document 499-2
Revised 10/08/08
Document 499-3
Coupled Inductors for SEPIC – MSD1278 Series
Typical L vs Current
Typical L vs Frequency
10000
10000
-105
-474
-104
100
-473
-103
10
-105
1000
Inductance (µH)
Inductance (µH)
1000
-474
-104
100
-473
-103
10
-472
-472
1
1
0.1
10
1
100
0.01
Current (A)
0.1
1
10
Frequency (MHz)
Current Derating
100
90
80
70
60
50
40
30
20
25°C
Percent of rated current
120
110
Isat
Irms
10
0
-40
-20
0
20
40
60
80
100
120 140
Ambient temperature (°C)
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2010
Document 499-3
Revised 10/08/08
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