E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
For Linear Technology LT1725 Isolated Flyback Controller
S
CHEMATICS
Operates with 36 - 72V input
Can be used in isolated and non-isolated designs
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 : 0.12
Pri : Bias
1 : 0.47
L
at 0A
(uH
±10%)
94.0
L
at Ipk
(uH
Min)
84.6
Leakage
Inductance
(nH Max)
3.9
DCR
(Ohm Max)
Pri
0.210
Ipk
(A)
Bias
0.453
1.2
Output
Sec
0.01
835-00952 835-00952F
5V, 2A
Notes:
1. Inductance is measured at 250kHz, 0.3Vrms.
2. Peak primary current, Ipk, is drawn at minimum input voltage.
3. DCR for the secondary is with the windings connected in parallel.
4.Leakage Inductance for the primary winding is with the secondary windings shorted.
5. Turns ratio is with the secondary windings connected in parallel.
6. Output of the secondary is with the windings connected in parallel. Bias winding output is 15V, 0.2A.
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
PX215(01)
Revised in 08/07
E & E Magnetic Products Limited
POWER TRANSFORMER
Flyback Transformer for PoE
For Linear Technology LT1725 Isolated Flyback Controller
M
ECHANICAL
D
IMENSIONS
.492
12.50
.089
2.26
.675
17.15 MAX
12
7
.098
2.50
EE
.865
21.97 MAX
.900
22.86
835-00952
(DATE)
.060
1.52
Pin 1
location
1
6
.028
0.71
Recommended
Pad Layout
.012±.008
0.30±0.20
.330
MAX
8.38
REFERENCE OR
GAUGE PLANE
.098±.010
2.50±0.25
.492±.010
12.50±0.25
.050-.080
1.27-2.03
Notes:
8. All dimensions are specified in
inches
with higher precedence in inches.
mm
9. Unless otherwise specified, all tolerances are ±
.010
.
0.25
.004
max.
10. Coplanarity:
0.10
Weight (in gram)
Tape & Reel
:
:
6.2 typ.
250 / reel
S
CHEMATICS
2
Primary
4
6
11
10
9
Sec
Bias
1
12
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
PX215(01)
Revised in 08/07
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