E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
Providing Power to PoE devices with up to 6 Watts
S
CHEMATICS
Flyback transformers designed for PoE (IEEE802.3af)
powered devices with up to 6 Watts
Designed for 250kHz switching frequency with input of
36 - 72V
Low Leakage Inductance
Hipot voltage: 1500Vrms
Operating temperature -40°C to +85°C.
RoHS compliant version is available
Custom design is also available
E
LECTRICAL
S
PECIFICATION @
25°C
Part
Number
RoHS
Part
Number
Turns Ratio
Pri : Sec
Pri : Bias
Inductance
at 0A
(uH ± 10%)
Inductance Leakage
at Ipk
Inductance
(uH Min)
(nH Max)
DCR
(mOhm Max)
Pri
Sec
Bias
Ipk
(A)
Secondary
Output
Continuous mode
835-00820
835-00821
835-00822
835-00823
835-00824
835-00820F
835-00821F
835-00822F
835-00823F
835-00824F
1 : 0.063
1 : 0.083
1 : 0.100
1 : 0.143
1 : 0.333
1 : 0.344
1 : 0.333
1 : 0.333
1 : 0.343
1 : 0.333
167
177
184
193
204
150.3
159.3
165.6
173.7
183.6
7.8
7.0
4.0
8.0
5.8
303
353
286
344
293
17
27
26
43
83
570
660
515
660
545
0.62
0.60
0.57
0.55
0.52
Vout=1.8V,3.3A
Vout=2.5V,2.4A
Vout=3.3V,1.8A
Vout=5.0V,1.2A
Vout=12V,0.5A
Discontinuous mode
835-00825
835-00826
835-00827
835-00828
835-00829
835-00825F
835-00826F
835-00827F
835-00828F
835-00829F
1 : 0.063
1 : 0.083
1 : 0.100
1 : 0.143
1 : 0.333
1 : 0.344
1 : 0.333
1 : 0.333
1 : 0.357
1 : 0.333
75
80
85
90
95
67.5
72.0
76.5
81.0
85.5
6.7
5.0
4.0
3.1
2.4
311
219
285
271
265
18
17
26
33
74
575
388
530
529
484
1.0
0.95
0.90
0.85
0.80
Vout=1.8V,3.3A
Vout=2.5V,2.4A
Vout=3.3V,1.8A
Vout=5.0V,1.2A
Vout=12V,0.5A
Notes:
1. Inductance is measured at 250kHz, 0.5Vrms, 0Adc.
2. Peak primary current, Ipk, is drawn at minimum input voltage.
3. DCR for the primary and for the secondary are with the windings connected in parallel.
4. Leakage Inductance is for the primary winding with the secondary winding shorted.
5. Turns ratio are with the primary and secondary windings connected in parallel.
6. Output of the secondary is with the windings connected in parallel. Bias winding output is 12V, 0.2A.
7. Designed to remain in continuous mode operation at power levels of 3 watts and above.
8.Operating temperature range: -40°
C
to +125°C. The part temperature (ambient temperature + temperature rise)
should not exceed the upper limit of the operating temperature under worst case operating conditions. Circuit design,
component placement, PWB trace size and thickness, airflow and other cooling provisions all affect the part
temperature. Part temperature should be verified in the end application.
2/F Block A, 94 Tokwawan Road, Kowloon, Hong Kong
1
Tel: (852) 2765 3888
Fax: (852) 2954 3304
PX205(01)
Revised in 06/12
E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
Providing Power to PoE devices with up to 6 Watts
M
ECHANICAL
D
IMENSIONS
.492
12.50
.098
2.50
.098
2.50
7
.650
MAX
16.50
12
.709
18.00
.661
16.80MAX
EE
8xx-00xxx
(DATE)
.069
1.75
1
6
.028
REF
0.70
Recommended
Pad Layout
REFERENCE OR
GAUGE PLANE
.098 ±.008
2.50 ±0.20
.492 ±.008
12.50±0.20
.291
MAX
7.40
Notes:
9. All dimensions are specified in
inches
with higher precedence in inches.
mm
10. Unless otherwise specified, all tolerances are ±
.010
.
0.25
Weight (in gram)
Tape & Reel
:
:
2.9 typ.
300 / reel
11. Coplanarity:
.004
max.
0.10
S
CHEMATICS
5
4
9
8
Pri
2
3
Sec
10
11
1
Bias
6
FOR MORE INFORMATION, PLEASE CONTACT
HEADQUARTER
2/F Block A, Merit Industrial Centre,
94 Tokwawan Road, Kowloon,
Hong Kong
Tel: (852) 2765 3888
Fax: (852) 2954 3304
Email: eempl@eleceltek.com
Website: http://www.eleceltek.com
Information herein is for reference only and subject to change without notice. It does not constitute any representation, warranty or commitment of the company in respect
of the products in any aspect. All logos, brands and product names mentioned herein are trademarks or registered trademarks of their respective owners. The company
does not assume any liability arising out of the application or use of any product or circuit described herein. Copyrights 2006, E & E Magnetic Products Limited.
2/F Block A, 94 Tokwawan Road, Kowloon, Hong Kong
2
Tel: (852) 2765 3888
Fax: (852) 2954 3304
PX205(01)
Revised in 06/12
微控制器 MCU
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