參數(shù)資料
型號(hào)： LTC4278IDKD#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 11/42頁(yè)
文件大?。?/td> 0K
描述： IC PD IEEE 802.3AT 25.5W 32-DFN
產(chǎn)品培訓(xùn)模塊： Power over Ethernet
標(biāo)準(zhǔn)包裝： 52
控制器類(lèi)型： 供電設(shè)備接口控制器（PD）
接口： IEEE 802.3af
電源電壓： 4.5 V ~ 20 V
電流 - 電源： 6.4mA
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 32-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 32-DFN（7x4）裸露焊盤(pán)
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1338 (CN2011-ZH PDF)
LTC4278
19
4278fc
An input diode bridge must be rated above the maximum
current the PD application will encounter at the tempera-
ture the PD will operate. Diode bridge vendors typically
call out the operating current at room temperature, but
derate the maximum current with increasing temperature.
Consult the diode bridge vendors for the operating current
derating curve.
Asilicondiodebridgecanconsumeover4%oftheavailable
power in some PD applications. Using Schottky diodes can
help reduce the power loss with a lower forward voltage.
A Schottky bridge may not be suitable for some high
temperature PD application. The leakage current has a
voltagedependencythatcanreducetheperceivedsignature
resistance. In addition, the IEEE 802.3af/at specification
mandates the leakage back-feeding through the unused
bridge cannot generate more than 2.8V across a 100k
resistor when a PD is powered with 57V.
Sharing Input Diode Bridges
At higher temperatures, a PD design may be forced to
consider larger bridges in a bigger package because the
maximum operating current for the input diode bridge is
drastically derated. The larger package may not be accept-
able in some space-limited environments.
One solution to consider is to reconnect the diode bridges
so that only one of the four diodes conducts current in
each package. This configuration extends the maximum
operating current while maintaining a smaller package
profile. Figure 7 shows how to reconnect the two diode
bridges. Consult the diode bridge vendors for the derating
curve when only one of four diodes is in operation.
Input Capacitor
The IEEE 802.3af/at standard includes an impedance
requirement in order to implement the AC disconnect
function. A 0.1F capacitor (C14 in Figure 7) is used to
meet this AC impedance requirement.
Transient Voltage Suppressor
The LTC4278 specifies an absolute maximum voltage of
100V and is designed to tolerate brief overvoltage events.
However, the pins that interface to the outside world can
routinely see excessive peak voltages. To protect the
LTC4278, install a transient voltage suppressor (D3) be-
tween the input diode bridge and the LTC4278 as shown
in Figure 7.
APPLICATIONS INFORMATION
Figure 7. PD Front-End with Isolation Transformer, Diode Bridges,
Capacitors, and a Transient Voltage Suppressor (TVS)
14
13
12
1
2
3
RX–
6
RX+
3
TX–
2
TX+
RJ45
T1
COILCRAFT
ETHI - 230LD
4278 F07
1
7
8
5
4
10
9
11
5
6
4
D3
SMAJ58A
TVS
B1100
BR1
HD01
BR2
HD01
TO PHY
VPORTP
LTC4278
C1
VPORTN VNEG
SPARE–
SPARE+
C14
0.1F
100V
相關(guān)PDF資料
PDF描述
KSZ8873MML IC ETHERNET SWITCH 3PORT 64-LQFP
V72A3V3C264BG2 CONVERTER MOD DC/DC 3.3V 264W
V72A3V3C264BG CONVERTER MOD DC/DC 3.3V 264W
V72A3V3C264BF3 CONVERTER MOD DC/DC 3.3V 264W
KSZ8851-16MLLI IC MAC CTLR 1PORT W/BUS 48-TQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4278IDKDTRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support
LTC4280 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring
LTC4280CUFD 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring
LTC4280CUFD#PBF 功能描述:IC CONTROLLER HOT SWAP QFN-24 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤(pán) 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
LTC4280CUFD#TRPBF 功能描述:IC CTLR HOT SWAP I2C MON 24QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤(pán) 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*