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参数资料
| 型号： | LTC4269CDKD-2#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| 封装： | 7 X 4 MM, PLASTIC, M0-229, DFN-32 |
| 文件页数： | 5/34页 |
| 文件大小： | 383K |
| 代理商： | LTC4269CDKD-2#TR |
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LTC4269-2
42692fb
applicaTions inForMaTion
OVERVIEW
Power over Ethernet (PoE) continues to gain popularity
as more products are taking advantage of having DC
power and high speed data available from a single RJ45
connector. As PoE continues to grow in the marketplace,
Powered Device (PD) equipment vendors are running into
the 12.95W power limit established by the IEEE 802.3af
standard.
The IEE802.3at standard establishes a higher power
allocation for Power over Ethernet while maintaining
backwards compatibility with the existing IEEE 802.3af
systems. Power Sourcing Equipment (PSE) and Powered
Devices are distinguished as Type 1 complying with the
IEEE 802.3af power levels, or Type 2 complying with the
IEEE 802.3at power levels. The maximum available power
of a Type 2 PD is 25.5W.
The IEEE 802.3at standard also establishes a new method
of acquiring power classification from a PD and communi-
cating the presence of a Type 2 PSE. A Type 2 PSE has the
option of acquiring PD power classification by performing
2-event classification (Layer 1) or by communicating with
the PD over the data line (Layer 2). In turn, a Type 2 PD
must be able to recognize both layers of communications
and identify a Type 2 PSE.
The LTC4269-2 is specifically designed to support a PD
that must operate under the IEEE 802.3at standard. In
particular, the LTC4269-2 provides the T2P indicator bit
which recognizes 2-event classification. This indicator
bit may be used to alert the LTC4269-2 output load that
a Type 2 PSE is present. With an internal signature resis-
tor, classification circuitry, inrush control, and thermal
shutdown, the LTC4269-2 is a complete PD interface
solution capable of supporting in the next generation PD
applications.InadditiontothePDfrontend,theLTC4269-2
also incorporates a high efficiency synchronous forward
controllerthatminimizescomponentsizeswhilemaximiz-
ing output power.
MODES OF OPERATION
The LTC4269-2 has several modes of operation depend-
ing on the input voltage applied between the VPORTP and
VPORTN pins. Figure 1 presents an illustration of voltage
DETECTION V1
CLASSIFICATION
ON
UVLO
POWER
BAD
UVLO
ON
= RLOAD C1
PWRGD TRACKS
VPORTN
DETECTION V2
50
TIME
40
30
V PORTP
(V)
20
10
50
40
30
20
10
TIME
V PORTP
–
V
NEG
(V)
–10
TIME
–20
–30
V PORTP
–
PWRGD
(V)
PWRGD
–
V
NEG
(V)
–40
–50
20
10
PD
CURRENT
INRUSH
dV
dt
INRUSH
C1
=
POWER
BAD
PWRGD
TRACKS
VPORTP
PWRGD
TRACKS
VPORTP
POWER
BAD
POWER
BAD
TIME
POWER
GOOD
POWER
GOOD
DETECTION I1
CLASSIFICATION
ICLASS
DETECTION I2
LOAD, ILOAD
42692 F01
ICLASS DEPENDENT ON RCLASS SELECTION
INRUSH = 100mA
I1 = V1 – 2 DIODE DROPS
25k
ILOAD =
VPORTP
RLOAD
I2 = V2 – 2 DIODE DROPS
25k
VPORTP
PSE
IIN
RLOAD
RCLASS
C1
RCLASS
PWRGD
LTC4269-2
VNEG
VPORTN
IN DETECTION
RANGE
Figure 1. Output Voltage, PWRGD, PWRGD and
PD Current as a Function of Input Voltage
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| LTC4269CDKD-2 | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| LTC4269IDKD-2#TR | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| LTC4412IS6#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4269CDKD-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4269IDKD-1#PBF | 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4269IDKD-1#TRPBF | 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4269IDKD-1-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller |
| LTC4269IDKD-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller |
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