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LTC4267-1 PDF预览

LTC4267-1

更新时间： 2024-09-13 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 以太网开关光电二极管稳压器
页数 文件大小 规格书
32页 373K
描述
具集成型开关稳压器的以太网供电 IEEE 802.3af PD 接口

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中文翻译

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LTC4267-1 数据手册

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LTC4267-1  
Power over Ethernet  
IEEE 802.3af PD Interface with  
Integrated Switching Regulator  
DescripTion  
FeaTures  
n
Complete Power Interface Port for IEEE 802®.3af  
Powered Device (PD)  
The LTC®4267-1 combines an IEEE 802.3af compliant  
PoweredDevice(PD)interfacewithacurrentmodeswitch-  
ing regulator, providing a complete power solution for PD  
applications. The LTC4267-1 integrates the 25k signature  
resistor, classification current source, thermal overload  
protection, signaturedisableandpowergoodsignalalong  
with an undervoltage lockout optimized for use with the  
IEEE-required diode bridge. The LTC4267-1 provides an  
increased operational current limit, maximizing power  
available for class 3 applications.  
n
n
n
n
n
n
n
n
n
Onboard 100V, UVLO Switch  
Precision Dual Level Inrush Current Limit  
Integrated Current Mode Switching Regulator  
Onboard 25k Signature Resistor with Disable  
Programmable Classification Current (Class 0-4)  
Thermal Overload Protection  
Power Good Signal  
Integrated Error Amplifier and Voltage Reference  
Low Profile 16-Pin SSOP Package  
The current mode switching regulator is designed for  
driving a 6V rated N-channel MOSFET and features pro-  
grammable slope compensation, soft-start, and constant  
frequency operation, minimizing noise even with light  
loads. TheLTC4267-1includesanonboarderroramplifier  
and voltage reference allowing use in both isolated and  
nonisolated configurations.  
applicaTions  
n
IP Phone Power Management  
n
Wireless Access Points  
n
Security Cameras  
Power over Ethernet  
n
The LTC4267-1 is available in a space saving, low profile  
16-pin SSOP package.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
LTPoE is a trademark of Linear Technology Corporation. All other trademarks are the property  
++  
of their respective owners.  
Typical applicaTion  
Class 2 PD with 3.3V Isolated Power Supply  
PA1133 SBM1040  
3.3V  
1.5A  
10k  
+
–48V  
•
HD01  
FROM  
V
P
PORTP  
VCC  
+
320µF  
MIN  
P
CHASSIS  
DATA PAIR  
5µF  
VCC  
+
–
•
MIN  
4.7µF  
PWRGD  
LTC4267-1  
SMAJ58A  
NGATE  
SENSE  
/RUN  
Si3440  
10k  
0.1µF  
0.1Ω  
P
VCC  
R
I
TH  
CLASS  
470Ω  
22nF  
+
HD01  
R
–48V  
FROM  
SPARE PAIR  
CLASS  
68.1Ω  
6.8k  
V
FB  
1%  
–
100k  
SIGDISA  
PGND  
BAS516  
V
P
OUT  
PORTN  
PS2911  
60.4k  
TLV431  
42671 TA01  
42671fa  
1
For more information www.linear.com/4267-1  
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