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LTC4268-1_12 PDF预览

LTC4268-1_12

更新时间： 2024-09-15 12:23:03
品牌 Logo 应用领域
凌特 - Linear 光电光电二极管控制器
页数 文件大小 规格书
46页 424K
描述
High Power PD With Synchronous No-Opto Flyback Controller

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中文翻译

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LTC4268-1_12 数据手册

 浏览型号LTC4268-1_12的Datasheet PDF文件第2页浏览型号LTC4268-1_12的Datasheet PDF文件第3页浏览型号LTC4268-1_12的Datasheet PDF文件第4页浏览型号LTC4268-1_12的Datasheet PDF文件第5页浏览型号LTC4268-1_12的Datasheet PDF文件第6页浏览型号LTC4268-1_12的Datasheet PDF文件第7页 
LTC4268-1  
High Power PD With  
Synchronous No-Opto  
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 precisiondualcurrent limit, the LTC4268-1 keepsinrush  
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 802.3af Compliant  
n
Rugged 750mA Power MOSFET With Precision Dual  
Level Current Limit  
n
High Performance Synchronous Flyback Controller  
n
IEEE Isolation Obtained Without an Opto-Isolator  
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’spatentedNo-Opto  
feedback topology to provide full IEEE 802.3af isolation  
without the need of opto-isolator 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.  
n
Magnetic Card Readers  
n
High Power PoE Systems  
++  
L, LT, LTC, LTM and SwitcherCAD are registered trademarks and LTPoE and ThinSOT are  
trademarks of Linear Technology Corporation. All other trademarks are the property of their  
respective owners. Protected by U.S. Patents including 5841643.  
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
PGDLY  
t
SYNC  
R
ENDLY  
OSC GND SFST C  
CMP  
PORTN  
NEG  
ON  
CMP  
•
•
R
CLASS  
10k  
12k  
169k  
100k  
47pF  
BAT54  
T1: PA1477NL  
T2: PA0184  
42681 TA01a  
0.033µF  
42681fc  
1
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中文翻译

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