Document 402-1
Miniature Flyback Transformers for PoE
With a footprint roughly 16.5 mm square and with a
height less than 7.5 mm, these are very space-efficient
Power over Ethernet (PoE) transformers. They are
designed for 6 Watt, IEEE 802.3af-compliant applica-
tions for powered devices (PD).
These transformers feature interleaved primary and
secondary windings to minimize leakage inductance,
and a separate bias winding. Isolation is 1500 Vrms
between the primary and secondary windings.
There are versions for continuous and discontinuous
modes of operation, each designed to operate at a
250 kHz switching frequency. Input is 36 – 72 Volts and
the output of the bias winding is 12 V, 0.2 A.
Coilcraft Designer’s Kit C182 contains samples of all parts.
To order, contact Coilcraft or visit http://order.coilcraft.com
to purchase on-line.
Inductance Inductance
Leakage
at 0 A2
at Ipk3
inductance4
Ipk3 Secondary
DCR max (Ohms)
pri sec bias
Turns ratio
Part
Power
(W)
number1
10ꢀ (µH)
min (µH)
max (µH) pri/sec pri/bias (A) output
Continuous mode5
POE60C-18_
POE60C-25_
POE60C-33_
POE60C-50_
POE60C-12_
6
6
6
6
6
167.0
177.0
184.0
193.0
204.0
150.3
159.3
165.6
173.7
183.6
0.303 0.017 0.570
0.353 0.027 0.660
0.286 0.026 0.515
0.344 0.043 0.660
0.293 0.083 0.545
7.8
7.0
4.0
8.0
5.8
16
12
10
7
2.9
3.0
3.0
2.9
3.0
0.62 1.8 V, 3.3 A
0.60 2.5 V, 2.4 A
0.57 3.3 V, 1.8 A
0.55 5.0 V, 1.2 A
0.52 12.0 V, 0.5 A
3
Discontinuous mode
POE60D-18_
POE60D-25_
POE60D-33_
POE60D-50_
POE60D-12_
6
6
6
6
6
75.0
80.0
85.0
90.0
95.0
67.5
72.0
76.5
81.0
85.5
0.311 0.018 0.575
0.219 0.017 0.388
0.285 0.026 0.530
0.271 0.033 0.529
0.265 0.074 0.484
6.7
5.0
4.0
3.1
2.4
16
12
10
7
2.9
3.0
3.0
2.8
3.0
1.0
1.8 V, 3.3 A
0.95 2.5 V, 2.4 A
0.90 3.3 V, 1.8 A
0.85 5.0 V, 1.2 A
0.80 12.0 V, 0.5 A
3
1. When ordering, please specify packaging code:
POE60D-12D
9,8
Secondary
11,10
5,4
Primary
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (400 parts per full reel).
3,2
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.
1
Bias
2. Inductance is measured at 250 kHz, 0.5 Vrms.
3. Peak primary current drawn at minimum input voltage.
4. Leakage inductance is for the primary winding with the secondary
winding shorted.
6
5. Designed to remain in continuous mode operation at power levels of
3 Watts and above.
6. Operating temperature range –40°C to +125°C.
7. Electrical specifications at 25°C.
Specifications subject to change without notice. Document 402-1 Revised 10/12/04
© Coilcraft, Inc. 2005
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