POEPHYTEREV-E National Semiconductor, POEPHYTEREV-E Datasheet - Page 33
POEPHYTEREV-E
Manufacturer Part Number
POEPHYTEREV-E
Description
BOARD EVAL LM5072, DP83848I
Manufacturer
National Semiconductor
Series
PHYTER®r
Datasheets
1.DP83848IVVNOPB.pdf
(84 pages)
2.LM5072MHX-50NOPB.pdf
(26 pages)
3.DP83848C-MAU-EK.pdf
(18 pages)
Specifications of POEPHYTEREV-E
Main Purpose
Special Purpose DC/DC, Power Over Ethernet
Outputs And Type
1, Isolated
Power - Output
24W
Voltage - Output
3.3V
Current - Output
7.3A
Voltage - Input
39 ~ 57V
Regulator Topology
Flyback
Frequency - Switching
250kHz
Board Type
Fully Populated
Utilized Ic / Part
DP83848, LM5072
Lead Free Status / RoHS Status
Not applicable / Not applicable
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5.0 Design Guidelines
5.1 TPI Network Circuit
Figure 11 shows the recommended circuit for a 10/100
Mb/s twisted pair interface. To the right is a partial list of
recommended transformers. It is important that the user
realize that variations with PCB and component character-
istics requires that the application be tested to ensure that
the circuit meets the requirements of the intended applica-
tion.
PLACE RESISTORS AND
CAPACITORS CLOSE TO
THE DEVICE.
RD+
RD-
TD-
TD+
49.9
49.9
49.9
49.9
Figure 11. 10/100 Mb/s Twisted Pair Interface
Vdd
Vdd
0.1 F
0.1 F
33
All values are typical and are +/- 1%
Pulse H1102
Pulse H2019
Pulse J0011D21
Pulse J0011D21B
Vdd
NOTE: CENTER TAP IS PULLED TO VDD
*PLACE CAPACITORS CLOSE TO THE
0.1µF*
0.1µF*
TRANSFORMER CENTER TAPS
COMMON MODE CHOKES
MAY BE REQUIRED.
1:1
1:1
T1
www.national.com
RD-
RD+
TD-
TD+
RJ45
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