E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
For National Semiconductor LM5071 & LM5072 PD Controllers
Designed to operate at frequency of 250kHz
S
CHEMATICS
with input
voltage of 36 - 72V
S
CHEMATICS
Can also accept a 12V input from auxiliary sources
Low Leakage Inductance
Hipot voltage between the primary and bias windings to
the secondary windings: 1500Vrms
Operating temperature -40°C to +125°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
1 : 0.20
Pri : Bias
1 : 0.60
L
at 0A
(uH
±10%)
55
L
at Ipk
(uH
Min)
40.2
Leakage
Inductance
(nH Max)
0.62
DCR
(Ohm Max)
Pri
0.026
Ipk
(A)
Bias
0.388
2.4
Output
Sec
0.0026
835-00962 835-00962F
3.3V, 3.3A
Notes:
1. Inductance is measured at 250kHz, 0.7Vrms.
2. Peak primary current, Ipk, is drawn at minimum input voltage.
3. DCR for the primary and for the secondary is measured with the corresponding windings connected in parallel.
4.Leakage Inductance for the primary winding is with all secondary pins shorted.
5. Turns ratio is with the primary windings and the secondary windings connected in parallel.
6. Hipot is measured from primary and auxilliary windings to secondary windings.
7.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
PX225(01)
Revised in 08/07
E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
For National Semiconductor LM5071 & LM5072 PD Controllers
M
ECHANICAL
D
IMENSIONS
.590
14.99
.860
MAX
21.84
12
7
.130
3.30
.118
3.00
EE
1.150
MAX
29.21
835-00962
(DATE)
1
.028
TYP
0.71
6
1.190
30.23
.060
1.52
Recommended
Pad Layout
.012 ±.008
0.30 ±0.20
.450
MAX
11.43
REFERENCE OR
GAUGE PLANE
.118±.010
3.00 ±0.25
.590 ±.010
14.99±0.25
.080 TYP
2.03
Notes:
8. All dimensions are specified in
inches
with higher precedence in inches.
mm
9. Unless otherwise specified, all tolerances are ±
.010
.
0.25
Weight (in gram)
Tape & Reel
:
:
13.2 typ.
140 / reel
10. Coplanarity:
.004
max.
0.10
S
CHEMATICS
1
2
12
11
10
Pri
4
3
Sec
9
8
5
7
Aux
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
PX225(01)
Revised in 08/07
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