Document 982F-1
For Flyback, SEPIC, Zeta
and other applications
Coupled Chip Inductors PFD3215
The PFD3215 has a footprint less than 3.2 2.3 mm,
making this shielded coupled inductor ideal for applica-
tions with limited board space. It is designed for use in
a variety of circuits including flyback, multi-output buck,
SEPIC and Zeta.
These inductors provide high efficiency and excellent cur-
rent handling in a rugged, low cost part.
They can also be used as two single inductors connected
in series or parallel, as a wideband transformers or as a
common mode choke.
+ +
D
C
V
L1 L2
OUT
C
V
IN
SW
Typical Flyback Converter
+
D
V
OUT
0.131 1 4 C
AUX
L2
max
3,32
L1 L2
0.059
max
++
1,5
2 3
L1
V
V C OUT
D
0.078 IN
SW
0.006
1,98
0,15
Typical Buck Converter with auxiliary output
0.088
0.014 0.003 0.024
0,356 0,0762 0,610 2,24
0.030 D
0,762
++
12 4 3
L1 C1
0.092
max
2,33 V
V C Q L2 C OUT
IN
4
3 12
Recommended
0.028
0.025
Typical SEPIC schematic
Land Pattern 0,711
0,635
inches
Dimensions are in
mm
++
L2
C1
Q
V
D
V CCL1 OUT
IN
Typical Zeta schematic
Specifications subject to change without notice.
US +1-847-639-6400 sales@coilcraft.com Document 982F-1 Revised 12/05/12
US +1-847-639-6400 sales@coilcraft.com
Please check our website for latest information.
UK +44-1236-730595 sales@coilcraft-europe.com
UK +44-1236-730595 sales@coilcraft-europe.com Coilcraft Inc. 2017 Coilcraft Inc. 2017
This product may not be used in medical or high
This product may not be used in medical or high
TTaiwanaiwan +886-2-2264 3646 sales@coilcraft.com.tw+886-2-2264 3646 sales@coilcraft.com.tw
risk applications without prior Coilcraft approval.
risk applications without prior Coilcraft approval.
China +86-21-6218 8074 sales@coilcraft.com.cn
China +86-21-6218 8074 sales@coilcraft.com.cn
Specification subject to change without notice.
Specification subject to change without notice.
Singapore + 65-6484 8412 sales@coilcraft.com.sg Please check web site for latest information.
Singapore + 65-6484 8412 sales@coilcraft.com.sg Please check web site for latest information.Document 982F-2
PFD3215 Coupled Inductors for SEPIC applications
6
Isat (A) Irms (A)
DCR SRF Coupling Leakage
2 3 4 5
Inductance max typ coefficient inductance 10% 20% 30% both one
1 7 8
Part number 20% (H) (Ohms) (MHz) typ typ (H) drop drop drop windings winding
PFD3215-391ME_ 0.39 0.070 600 0.89 0.08 2.10 2.30 2.40 0.98 1.39
PFD3215-102ME_ 1.0 0.123 400 0.95 0.09 1.35 1.55 1.65 0.85 1.20
PFD3215-182ME_ 1.8 0.250 230 0.97 0.11 1.00 1.20 1.30 0.60 0.85
PFD3215-222ME_ 2.2 0.265 270 0.97 0.13 0.95 1.05 1.15 0.57 0.81
PFD3215-332ME_ 3.3 0.360 190 0.98 0.14 0.75 0.83 0.90 0.55 0.78
PFD3215-472ME_ 4.7 0.450 175 0.98 0.17 0.65 0.75 0.80 0.51 0.72
PFD3215-682ME_ 6.8 0.630 155 0.98 0.25 0.55 0.65 0.70 0.40 0.57
PFD3215-103ME_ 10 1.25 110 0.98 0.31 0.45 0.50 0.55 0.27 0.38
1. When ordering, please specify packaging code:
Coupled Inductor Core and Winding Loss Calculator
This web-based utility allows you to enter frequency,
PFD3215-103MEC
peak-to-peak (ripple) current, and Irms current to predict
Packaging: C = 7 machine-ready reel. EIA-481 embossed plastic tape
temperature rise and overall losses, including core loss.
(2000 parts per full reel).
Go to online calculator.
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. Fac-
tory order only, not stocked (7500 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 the primary winding with the secondary windings
shorted.
6. DC current, at which the inductance drops the specified amount from its value
without current. It is the current flowing in one winding.
7. Equal current when applied to each winding simultaneously that causes a 40C
temperature rise from 25C ambient. See temperature rise calculation.
8. Maximum current when applied to one winding that causes a 40C temperature
rise from 25C ambient. See temperature rise calculation.
9. Electrical specifications at 25C.
Refer to Doc 639 Selecting Coupled Inductors for SEPIC Applications.
Refer to Doc 362 Soldering Surface Mount Components before soldering.
PFD3215 Coupled Inductors for Flyback applications
Inductance Inductance DCR Leakage
2 3 4 3
at 0 A at Ipk A max inductance Turns Ipk
1
Part number 20% (H) 20% (H) (Ohms) typ (H) ratio (A)
PFD3215-391ME_ 0.39 0.27 0.070 0.08 1 : 1 2.40
PFD3215-102ME_ 1.0 0.70 0.123 0.09 1 : 1 1.65
PFD3215-182ME_ 1.8 1.26 0.250 0.11 1 : 1 1.30
PFD3215-222ME_ 2.2 1.54 0.265 0.13 1 : 1 1.15
PFD3215-332ME_ 3.3 2.31 0.335 0.14 1 : 1 0.90
PFD3215-472ME_ 4.7 3.29 0.442 0.17 1 : 1 0.80
PFD3215-682ME_ 6.8 4.76 0.600 0.25 1 : 1 0.70
PFD3215-103ME_ 10 7.00 1.25 0.31 1 : 1 0.55
1. When ordering, please specify packaging code: 2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc on
an Agilent/HP 4284A LCR meter or equivalent.
PFD3215-103MEC
3. Peak primary current drawn at minimum input voltage.
Packaging: C = 7 machine-ready reel. EIA-481 embossed plastic
4. Leakage inductance is for the primary winding with the secondary
tape (2000 parts per full reel).
windings shorted.
B = Less than full reel. In tape, but not machine ready.
5. Electrical specifications at 25C.
To have a leader and trailer added ($25 charge), use
Refer to Doc 362 Soldering Surface Mount Components before soldering.
code letter D instead.
D = 13 machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (7500 parts per
full reel).
Specifications subject to change without notice.
Document 982F-2 Revised 12/05/12
US +1-847-639-6400 sales@coilcraft.com
Please check our website for latest information.
UK +44-1236-730595 sales@coilcraft-europe.com Coilcraft Inc. 2017
This product may not be used in medical or high
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
risk applications without prior Coilcraft approval.
China +86-21-6218 8074 sales@coilcraft.com.cn
Specification subject to change without notice.
Singapore + 65-6484 8412 sales@coilcraft.com.sg Please check web site for latest information.