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LTC4268CDKD-1-PBF PDF预览

LTC4268CDKD-1-PBF

更新时间： 2024-09-15 05:43:59
品牌 Logo 应用领域
凌特 - Linear 光电二极管控制器
页数 文件大小 规格书
48页 401K
描述
High Power PD with Synchronous NoOpto Flyback Controller

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中文翻译

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LTC4268CDKD-1-PBF 数据手册

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LTC4268-1  
High Power PD with  
Synchronous NoOpto  
Flyback Controller  
FEATURES  
DESCRIPTION  
The LTC®4268-1 is an integrated Powered Device (PD)  
controllerandswitchingregulatorintendedforIEEE802.3af  
and high power PoE applications up to 35W. By including  
a precision dual current limit, the LTC4268-1 keeps inrush  
below IEEE 802.3af current limit levels to ensure interop-  
erability success while enabling high power applications  
with a 750mA operational current limit.  
n
Robust 35W PD Front End  
n
IEEE 8X02.3af Compliant  
n
Rugged 750mA Power MOSFET with Precision Dual  
Level Current Limit  
n
High Performance Synchronous Flyback Controller  
n
IEEE Isolation Obtained without an Optoisolator  
n
Adjustable Frequency from 50kHz to 250kHz  
n
Tight Multi-Output Regulation with Load  
The LTC4268-1 synchronous, current-mode, flyback  
controller generates multiple supply rails in a single  
conversion providing for the highest system efficiency  
while maintaining tight regulation across all outputs. The  
LTC4268-1includesLinearTechnology’spatentedNoOpto  
feedback topology to provide full IEEE 802.3af isolation  
without the need of optoisolator circuitry.  
Compensation  
Onboard 25k Signature Resistor  
n
n
Programmable Classification Current to 75mA  
n
Complete Thermal and Over-Current Protection  
n
Available in Compact 32-Pin 7mm × 4mm DFN  
Package  
APPLICATIONS  
The oversized power path and high performance flyback  
controller of the LTC4268-1 combine to make the ultimate  
solutionforpowerhungryPoEapplicationssuchasWAPs,  
PTZ security cameras, RFID readers and ultra-efficient  
802.3af applications running near the 12.95W limit.  
n
VoIP Phones with Advanced Display Options  
n
Dual-Radio Wireless Access Points  
n
PTZ Security Cameras  
n
RFID Readers  
Industrial Controls  
n
The LTC4268-1 is available in a space saving 32-pin DFN  
package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 5841643.  
n
Magnetic Card Readers  
n
High Power PoE Systems  
TYPICAL APPLICATION  
35W High Efficiency PD Solution  
3.3V  
+
+
470μF  
×4  
•
≥5μF  
100pF  
56Ω  
28.7k  
1%  
BAS21  
20Ω  
T1  
47k  
47Ω  
•
T1  
SMAJ58A  
100k  
B0540W  
•
3.01k  
1%  
DF1501S  
FMMT618  
47μF  
Si4490DY  
Si7336ADP  
~ +  
–54V FROM  
DATA PAIR  
~ –  
FMMT718  
0.1μF  
+
V
PWRGD PWRGD UVLO I  
V
CC  
FB PG  
SENSE  
PORTP  
LIM_EN  
DF1501S  
~ +  
~ –  
1μF  
0.02Ω  
330Ω  
SHDN  
–54V FROM  
SPARE PAIR  
–
SENSE  
15Ω  
LTC4268-1  
R
CLASS  
SG  
2.2nF  
0.1μF  
10nF  
20k  
V
CMP  
T2  
V
V
NEG  
PGDLY  
t
SYNC  
R
ENDLY  
OSC GND SFST C  
CMP  
PORTN  
ON  
CMP  
•
•
R
10k  
12k  
169k  
100k  
47pF  
CLASS  
BAT54  
T1: PA1477NL  
T2: PA0184  
42681 TA01a  
0.033μF  
42681fa  
1
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中文翻译

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