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參數資料
| 型號： | PTB48540CAZ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 10 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PACKAGE-13 |
| 文件頁數： | 12/12頁 |
| 文件大?。?/td> | 219K |
| 代理商： | PTB48540CAZ |
Application Notes
For technical support and further information visit http://power.ti.com
16
15
14
1
2
3
TX1+
TX1–
TXCT
TD+
TD-
TCT
11
10
9
6
7
8
RX1+
RX1–
RXCT
RD+
RD-
RCT
5
4
12
13
N/C
1:1
PoE Interface Transformer
H2019 (Pulse Engineering)
J1
RJ-45
Ethernet
Connection
from PSE
PD
Circuitry
N/C
PTB48540B
10
Data Line B
9
Spare Line A
4
Spare Line B
8
Input Ref
7
A - Detect - B
A - Class - B
Output Inhibit
Data Line A
+V
OUT
V
OUT Adj
–V
OUT
3
2
1
5612
11
13
+3.3 V
0 V
L1
T1
T2
1
2
3
4
5
6
7
8
Figure 4-1; Power-Over-Ethernet Application Schematic
PTB48540 Series
Using the PTB48540 Series Module in a
Power-Over-Ethernet (PoE) Application
The schematic of Figure 4-1 shows an example of how a
PTB48540 module may be connected to a PoE compliant
system. The connector J1 is the input from the PoE source.
In a Power-over-Ethernet (PoE) application, the power
and high-frequency data signals share the same conductors
in the Ethernet cable. The data and power signals must
be separated using an IEEE 802.3af compliant PoE mag-
netic module.
The magnetic module incorporates the customary isola-
tion transformers, T1 and T2. The transformers each
include a center tap, across which the dc current from the
Ethernet power source equipment (PSE) is conveniently
extracted. The transmit and receive hf Ethernet data
appear as differential signals to each transformer. These
signals are isolated by the transformers, allowing the
Ethernet communication content to flow freely between
the connector and the powered device (PD) circuitry.
The common-mode inductor, L1, is a popular addition
to off-the-shelf PoE magnetic modules. The inductor
provides additional rejection to common mode noise
currents, which may otherwise be present on either the
data or power signals.
The PTB48540 module complies with the PoE protocols,
provides the required isolation, and converts the raw
power from the PSE to a precision regulated 3.3-VDC
power source for the remote PD circuitry.
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相關代理商/技術參數 |
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| PTB48550AAH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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