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AN2487 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2487
Description  power over Ethernet powered device demonstration board
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2487 Datasheet(HTML) 10 Page - STMicroelectronics

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Circuit descriptions
AN2487
10/32
3
Circuit descriptions
Figure 5.
Test and Ethernet source connection circuitry
3.1
Inputs
3.1.1
Power supplies
There are three methods of powering the demonstration board:
1.
Unused pairs (J1)
The unused twisted pairs in the Ethernet cable can carry power to RJ-45 pins 4 and 5,
and pins 7 and 8.
2.
Simplex leads (J1)
The transformer windings are center tapped, and power is carried over the same pairs
as the signal leads. The DC power current balances out in the transformer - saturation
of the core does not occur, and the signals can pass. Power is drawn off the centertaps
(simplex leads) and signals are coupled to another winding.
3.
Auxiliary DC input (TB1)
For convenience, this input method is provided for test and evaluation. Each input is
sent through its own bridge rectifier so that it is polarity insensitive.
48V-SW
U1
STHS4257A
/PG
6
RTN
5
CLASS
2
D1
DF02M
4
1
C1
0.1uF
100V
R1
DNI
1/8W
1%
R2
100K
1/8W
48V+
48V-SW
D2
DF02M
4
1
D4
DF02M
4
1
J3
Phoenix 2 pin
1
2
J2
RJ-45
1
2
3
4
5
6
7
8
/PG
TO POWER CONVERTER, SHEET 2 OF 2
D3
SMAJ58A
T2
POE Signal XFMR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
J1
RJ-45
1
2
3
4
5
6
7
8
TO POWER SOURCING EQUIPMENT
UNPOWERED, ISOLATED, SIMPLEX LOOPBACK
48V+
/PG



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