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參數(shù)資料
| 型號： | LTC4259AIGW-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect; Package: SSOP; No of Pins: 36; Temperature Range: -40°C to +85°C |
| 中文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36 |
| 封裝： | 0.300 INCH, LEAD FREE, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 416K |
| 代理商： | LTC4259AIGW-1#TRPBF |
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LTC4259A-1
14
4259a1fa
APPLICATIO S I FOR ATIO
WU
UU
Figure 11. Power over Ethernet System Diagram
OVERVIEW
Over the years, twisted-pair Ethernet has become the most
commonly used method for local area networking. The
IEEE 802.3 group, the originator of the Ethernet standard,
has defined an extension to the standard, known as
802.3af, which allows DC power to be delivered simulta-
neously over the same cable used for data communica-
tion. This promises a whole new class of Ethernet devices,
including IP telephones, wireless access points, and PDA
charging stations, which do not require additional AC
wiring or external power transformers, a.k.a. “wall warts.”
With about 13W of power available, small data devices can
be powered by their Ethernet connections, free from AC
wall outlets. Sophisticated detection and power monitor-
ing techniques prevent damage to legacy data-only de-
vices, while still supplying power to newer, Ethernet-
powered devices over the twisted-pair cable.
A device that supplies power is called Power Sourcing
Equipment (PSE); a device that draws power from the
wire is called a Powered Device (PD). A PSE is typically an
Ethernet switch, router, hub, or other network switching
equipment that is commonly found in the wiring closets
where cables converge. PDs can take many forms: digital
IP telephones, wireless network access points, PDA or
notebook computer docking stations, cell phone charg-
ers, and HVAC thermostats are examples of devices that
can draw power from the network.
A PSE is required to provide a nominal 48V DC between
either the signal pairs or the spare pairs (but not both) as
shown in Figure 11. The power is applied as a voltage
between two of the pairs, typically by powering the center-
taps of the isolation transformers used to couple the
differential data signals to the wire. Since Ethernet data is
transformer coupled at both ends and is sent differentially,
a voltage difference between the transmit pairs and the
receive pairs does not affect the data. A 10base-T/
100base-TX Ethernet connection only uses 2 of the 4 pairs
in the cable. The unused or spare pairs can be powered
directly, as shown in Figure 11, without affecting the data.
However, 1000base-T uses all 4 pairs and power must be
connected to the transformer center taps if compatibility
with 1000base-T is required.
REGISTER FU CTIO S
U
way, the condition causing the LTC4259A-1 to pull the INT
pin down must be removed before the LTC4259A-1 will be
able to pull INT down again. This can be done by reading
and clearing the event registers or by writing a 1 into bit 7
of this register. Setting bit 7 releases the Interrupt pin,
clears all the Event registers and clears all the bits in the
Interrupt register.
4259A F11
SMAJ58A
58V
0.1
F
Tx
Rx
Tx
SMAJ58A
58V
DATA PAIR
VEE
SENSE GATE OUT
VDD
INT
SCL
SDAIN
SDAOUT
CMPD3003
10k
1k
0.1
F
100V
0.5
IRFM120A
S1B
SPARE PAIR
1/4
LTC4259A-1
DGND BYP
AGND
DETECT
I2C
3.3V
INTERRUPT
–48V
CAT 5
20
MAX
ROUNDTRIP
0.05
F MAX
RJ45
4
5
4
5
1
2
1
2
3
6
3
6
7
8
7
8
RJ45
1N4002
×4
1N4002
×4
PSE
PD
RCLASS
–48VIN
PWRGD
–48VOUT
LTC4257
GND
DC/DC
CONVERTER
5
F ≤ CIN
≤ 300F
+
–
VOUT
GND
0.47
F
100V
X7R
0.1
F
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相關代理商/技術參數(shù) |
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| LTC4259CGW-ES | 制造商:LINEAR_TECH 功能描述: |
| LTC4260 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:UV, OV and Reverse Supply Protection Controller Low Operating Current: 125μA |
| LTC4260CGN | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 24-Pin SSOP N |
| LTC4260CGN#PBF | 功能描述:IC CTLR HOT SWAP I2C 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內(nèi)部開關:無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4260CGN#TR | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 24-Pin SSOP N T/R |
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