E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
For National Semiconductor LM5020 PWM Controller
S
CHEMATICS
Designed to operate at frequencies up to 1MHz with input
voltage of 36 - 72V
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 : 0.23
Pri : Bias
1 : 0.69
L
at 0A
(uH
±10%)
110
L
at Ipk
(uH
Min)
99.0
Cap
Leakage -acitance
Inductance
(pF
(nH Max)
Max)
1.11
110
DCR
(Ohm Max)
Pri
0.133
Ipk
(A)
Bias
0.656
1.5
Output
Sec
0.019
835-00958 835-00958F
3.3V, 4.5A
Notes:
1. Inductance is measured at 10kHz, 0.1Vrms.
2. Peak primary current, Ipk, is drawn at minimum input voltage.
3. DCR for the secondary is per winding.
4.Leakage Inductance is measured between pins 4 and 6 with all other pins shorted.
5. Turns ratio is with the secondary windings connected in parallel.
6. Capacitance is measured between pin 3 and 4 with other pins shorted.
7. Hipot is measured from pin 4 to pin 1 and from pin 4 to pins 7, 8, and 9.
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
PX221(01)
Revised in 08/07
E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
For National Semiconductor LM5020 PWM Controller
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
835-00958
(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:
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
:
:
13.2 typ.
140 / reel
11. Coplanarity:
.004
max.
0.10
S
CHEMATICS
4
12
11
10
Pri
6
Sec
9
8
1
7
Bias
3
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
PX221(01)
Revised in 08/07
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