參數(shù)資料
型號(hào)： LTC4263CDE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 微控制器/微處理器
英文描述： Single IEEE 802.3af Compliant PSE Controller with Internal Switch; Package: DFN; No of Pins: 14; Temperature Range: 0°C to +70°C
中文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PDSO14
封裝： 4 X 3 MM, LEAD FREE, PLASTIC, MO-229WGED-3, DFN-14
文件頁(yè)數(shù)： 4/24頁(yè)
文件大?。?/td> 349K
代理商： LTC4263CDE#PBF
LTC4263
12
4263fe
APPLICATIONS INFORMATION
Figure 4. Classication Load Lines
Classication
An IEEE 802.3af PD has the option of presenting a
classication signature to the PSE to indicate how much
power it will draw when operating. This signature consists
of a specic constant-current draw when the PSE port
voltage is between 15.5V and 20.5V, with the current level
indicating the power class to which the PD belongs. Per
the IEEE 802.3af specication, there are ve classes and
three power levels for a PD as shown in Table 1. Note that
class 4 is presently reserved by the IEEE for future use.
Figure 4 shows an example PD load line, starting with the
shallow slope of the 25k signature resistor below 10V, then
drawing the classication current (in this case, class 3)
between 15.5V and 20.5V. Also shown is the load line for
the LTC4263. It maintains a low impedance until reaching
current limit at 60mA (typ).
The LTC4263 will classify a port immediately after a
successful detection. It measures the PD classication
signature current by applying 18V (typ) to the port and
measuring the resulting current. The LTC4263 identies
the three IEEE power levels and stores the detected class
internally for use by the power management circuitry. In
addition, the LTC4263 allows selectable enforcement of
IEEE classication power levels. With the ENFCLS pin
high, the LTC4263 reduces the ICUT current threshold if it
detects class 1 or class 2, thereby insuring that PDs which
violate their advertised class are shut down.
Table 1. IEEE 802.3af Classication, PD Power Consumption, and LTC4263 Enforced Power Output
IEEE 802.3af
CLASS
CLASSIFICATION
CURRENT
MAXIMUM
IEEE ALLOWABLE
PD POWER
LTC4263
ENFORCED ICUT
THRESHOLD*
CLASS DESCRIPTION
0
0mA to 5mA
12.95W
375mA (typ)
PD Does Not Implement Classication, Unknown Power
1
8mA to 13mA
3.84W
100mA (typ)
Low Power PD
2
16mA to 21mA
6.49W
175mA (typ)
Medium Power PD
3
25mA to 31mA
12.95W
375mA (typ)
Full Power PD
4
35mA to 45mA
12.95W
375mA (typ)
Reserved, Power as Class 0
*Enforced ICUT active if ENFCLS pin is high. Otherwise, ICUT is 375mA (typ).
VDD48 – VOUT
0
CURRENT
(mA)
60
50
40
30
20
10
0
510
15
20
4263 F04
25
TYPICAL
CLASS 3
PD LOAD
LINE
48mA
33mA
PSE LOAD
LINE
23mA
14.5mA
6.5mA
CLASS 4
CLASS 2
CLASS 1
CLASS 0
CLASS 3
OVER
CURRENT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4263CDE-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single IEEE 802.3af Compliant PSE Controller with Internal Switch
LTC4263CS 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single IEEE 802.3af Compliant PSE Controller with Internal Switch
LTC4263CS#PBF 功能描述:IC IEEE 803.2AF CNTRLR 14-SOIC RoHS:是 類別: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:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
LTC4263CS#TRPBF 功能描述:IC IEEE 803.2AF CNTRLR 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件
LTC4263CS-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single IEEE 802.3af Compliant PSE Controller with Internal Switch
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