Document 833-1
Coupled Inductors
LPD6235
For Flyback, SEPIC, Zeta
and other Applications
Tight coupling (k
≥
0.97) makes the LPD6235 series of
coupled inductors ideal for use in a variety of circuits
including flyback, multi-output buck, SEPIC and Zeta.
These coupled miniature shielded inductors are 3.5 mm
high and 6.0 mm square. They provide high inductance,
high efficiency and excellent current handling in low cost
part.
They can be used as two single inductors connected in
series or parallel, as a common mode choke or as a 1 : 1
transformer.
+
D
+
L1
V
IN
C
SW
L2
C
V
OUT
–
–
Typical Flyback Converter
+
C
V
OUT
AUX
0.236 ±0.003
6,0 ±0,08
1
4
Dot indicates pin 1
L2
+
V
IN
SW
D
D
–
0.236 ±0.003
6,0 ±0,08
+
L1
2
XXX X
Dash
number
C
V
OUT
3
–
–
Typical Buck Converter with auxiliary output
Internal
code
+
0.138
max
3,5
D
+
C
V
OUT
L1
C1
Q
Recommended
Land Pattern
1
4
V
IN
C
L2
0.167 0.079
4,25 2,00
2
0.047
1,20
45°
typ
0.260
6,60
–
Typical SEPIC schematic
–
+
Q
V
IN
+
C1
L2
D
C
V
OUT
3
0.079
2,00
0.079
2,00
0.167
4,25
0.260
6,60
4
L2
3
C
L1
–
Typical Zeta schematic
–
1
L1
2
Dimensions are in
inches
mm
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 833-1
Revised 09/08/14
© Coilcraft Inc. 2018
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 833-2
Coupled Inductors – LPD6235 Series
Part number
1
LPD6235-682ME_
LPD6235-103ME_
LPD6235-223ME_
LPD6235-473ME_
LPD6235-104ME_
LPD6235-474ME_
LPD6235-105ME_
LPD6235-155ME_
LPD6235-205ME_
Inductance
2
±20% (µH)
6.8
10
22
47
100
470
1000
1500
2000
DCR
max
3
(Ohms)
0.120
0.157
0.300
0.620
1.20
3.50
7.00
10.8
16.0
SRF
typ
4
(MHz)
31
26
15
9.7
7.0
3.0
1.9
1.5
1.3
Coupling Leakage
5
coefficient
L typ
typ
(µH)
0.99
0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
0.10
0.12
0.15
0.21
0.45
0.61
1.05
1.70
2.10
10%
drop
2.80
2.50
1.50
0.90
0.62
Isat
(A)
6
20%
drop
3.00
2.70
1.67
0.98
0.72
30%
drop
3.12
2.80
1.73
0.99
0.74
Irms
(A)
both
one
windings
7
winding
8
1.40
1.98
1.30
1.83
0.85
1.20
0.60
0.85
0.40
0.25
0.15
0.14
0.11
0.56
0.35
0.21
0.20
0.16
0.18
0.12
0.12
0.08
0.22
0.14
0.12
0.11
0.23
0.15
0.13
0.12
1. Please specify
termination
and
packaging
codes:
LPD6235-205MEC
Termination: E
= RoHS compliant Silver-palladium-platinum-glass frit.
Special order:
T
= RoHS tin-silver-copper (95.5/4/0.5) or
S
= non-
RoHS tin-lead (63/37).
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic
tape (350 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 C instead.
D
= 13″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (1500 parts per
full reel).
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. Leakage inductance is for L1 and is measured with L2 shorted.
6. DC current, at which the inductance drops the specified amount from its
value without current. It is the sum of the current flowing in both wind-
ings.
7. Equal current when applied to each winding simultaneously that causes
a 40°C temperature rise from 25°C ambient. See temperature rise
calculation.
8. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
9. 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.
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.
Go to online calculator
.
Core material
Ferrite
Core and winding loss
Go to online calculator
Weight
420 – 480 mg
Environmental
RoHS compliant, halogen free
Terminations
RoHS compliant silver-palladium-platinum-glass frit.
Other terminations available at additional cost.
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.
Tape and reel packaging: –40°C to +80°C
Winding to winding isolation
100 Vrms, one minute
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
350/7″ reel; 1500/13″ reel Plastic tape: 16 mm wide,
0.3 mm thick, 12 mm pocket spacing, 3.68 mm pocket depth
Recommended pick and place nozzle
OD: 6.2 mm; ID:
≤
3.1 mm
PCB washing
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 833-2
Revised 009/08/14
© Coilcraft Inc. 2018
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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