- 您现在的位置：买卖IC网 > PDF目录11577 > LTC4267CGN#TRPBF (Linear Technology)IC POE 802.3AF INTERFACE 16SSOP PDF资料下载
参数资料
| 型号： | LTC4267CGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 32/32页 |
| 文件大小： | 0K |
| 描述： | IC POE 802.3AF INTERFACE 16SSOP |
| 标准包装： | 2,500 |
| 控制器类型： | 以太网供电控制器（POE） |
| 接口： | IEEE 802.3af |
| 电流 - 电源： | 3mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
| 相关产品： | 732-2437-6-ND - TRANS FLYBACK POE 40UH SMD 732-2436-6-ND - TRANS FLYBACK POE 35UH SMD 732-2435-6-ND - TRANS FLYBACK POE 127UH SMD 732-2434-6-ND - TRANS FLYBACK POE 127UH SMD 732-2433-6-ND - TRANS FLYBACK POE 127UH SMD 732-2432-6-ND - TRANS FLYBACK POE 127UH SMD 732-2431-6-ND - TRANS FLYBACK POE 127UH SMD 732-2430-6-ND - TRANS FLYBACK POE 127UH SMD 732-2437-1-ND - TRANS FLYBACK POE 40UH SMD 732-2436-1-ND - TRANS FLYBACK POE 35UH SMD 更多... |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页当前第32页
LTC4267
9
4267fc
BLOCK DIAGRAM
4267 BD
VPORTN
BOLD LINE INDICATES HIGH CURRENT PATH
POUT
–
+
PGND
RCLASS
PWRGD
CONTROL
CIRCUITS
INPUT
CURRENT
LIMIT
POWER GOOD
CLASSIFICATION
CURRENT LOAD
1.237V
EN
375mA
140mA
9k
16k
–
+
EN
25k
SIGNATURE
RESISTOR
VPORTP
SIGDISA
–
+
–
+
SLOPE
COMP
CURRENT
RAMP
PVCC
GATE
DRIVER
NGATE
SENSE
200kHz
OSCILLATOR
UNDERVOLTAGE
LOCKOUT
Q
R
CURRENT
COMPARATOR
SHUTDOWN
COMPARATOR
SHUTDOWN
S
20mV
ITH/RUN
ERROR
AMPLIFIER
VFB
SOFT-
START
CLAMP
VCC
SHUNT
REGULATOR
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
0.28V
PVCC <
VTURNON
0.3A
PVCC
–
+
1.2V
800mV
REFERENCE
OVERVIEW
The LTC4267 is partitioned into two major blocks: a
Powered Device (PD) interface controller and a current
mode yback switching regulator. The Powered Device
(PD) interface is intended for use as the front end of a
PD adhering to the IEEE 802.3af standard, and includes
a trimmed 25kΩ signature resistor, classication current
source, and an input current limit circuit. With these
functions integrated into the LTC4267, the signature and
power interface for a PD can be built that meets all the
requirements of the IEEE 802.3af specication with a
minimum of external components.
The switching regulator portion of the LTC4267 is a con-
stant frequency current mode controller that is optimized
for Power over Ethernet applications. The regulator is
designed to drive a 6V N-channel MOSFET and features
soft-start and programmable slope compensation. The
integrated error amplier and precision reference give the
PD designer the option of using a nonisolated topology
without the need for an external amplier or reference. The
LTC4267 has been specically designed to interface with
both IEEE compliant Power Sourcing Equipment (PSE)
and legacy PSEs which do not meet the inrush current
requirement of the IEEE 802.3af specication. By setting
the initial inrush current limit to a low level, a PD using
the LTC4267 minimizes the current drawn from the PSE
during start-up. After powering up, the LTC4267 switches
to the high level current limit, thereby allowing the PD to
consume up to 12.95W if an IEEE 802.3af PSE is present.
This low level current limit also allows the LTC4267 to
charge arbitrarily large load capacitors without exceeding
the inrush limits of the IEEE 802.3af specication. This
dual level current limit provides the system designer with
exibility to design PDs which are compatible with legacy
PSEs while also being able to take advantage of the higher
power available in an IEEE 802.3af system.
Using an LTC4267 for the power and signature interface
functions of a PD provides several advantages. The
LTC4267 current limit circuit includes an onboard 100V,
400mA power MOSFET. This low leakage MOSFET is
APPLICATIO S I FOR ATIO
WU
UU
相关PDF资料 |
PDF描述 |
|---|---|
| 031-4237 | CONN BNC RCPT BULKHEAD REAR MNT |
| VI-2NJ-CV-S | CONVERTER MOD DC/DC 36V 150W |
| VI-2NF-CV-S | CONVERTER MOD DC/DC 72V 150W |
| 083-59SP | CONN PLUG UHF CRIMP RG59,140 |
| VI-2N4-CV-S | CONVERTER MOD DC/DC 48V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4267IDHC | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH -57V 16-Pin DFN EP |
| LTC4267IDHC#PBF | 功能描述:IC POE 802.3AF INTERFACE 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4267IDHC#TRPBF | 功能描述:IC POE 802.3AF INTERFACE 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4267IDHC-1#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LTC4267IDHC-3#PBF | 功能描述:IC POE 802.3AF W/REG 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
发布紧急采购，3分钟左右您将得到回复。