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LTC4269CDKD-2-TRPBF PDF预览

LTC4269CDKD-2-TRPBF

更新时间: 2024-11-05 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
34页 383K
描述
IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support

LTC4269CDKD-2-TRPBF 数据手册

 浏览型号LTC4269CDKD-2-TRPBF的Datasheet PDF文件第2页浏览型号LTC4269CDKD-2-TRPBF的Datasheet PDF文件第3页浏览型号LTC4269CDKD-2-TRPBF的Datasheet PDF文件第4页浏览型号LTC4269CDKD-2-TRPBF的Datasheet PDF文件第5页浏览型号LTC4269CDKD-2-TRPBF的Datasheet PDF文件第6页浏览型号LTC4269CDKD-2-TRPBF的Datasheet PDF文件第7页 
LTC4269-2  
IEEE 802.3at High Power PD  
and Synchronous Forward  
Controller with AUX Support  
DescripTion  
FeaTures  
The LTC®4269-2 is an integrated Powered Device (PD)  
interfaceandpowersupplycontrollerfeaturing2-event  
classification signaling, flexible auxiliary power op-  
tions, and a power supply controller suitable for syn-  
chronously rectified forward supplies. These features  
make the LTC4269-2 ideally suited for an IEEE802.3at  
PD application.  
n
25.5W IEEE 802.3at Compliant (Type-2) PD  
+
n
PoE 2-Event Classification  
n
IEEE 802.3at High Power Available Indicator  
n
Integrated State-of-the-Art Synchronous Forward  
Controller  
– Isolated Power Supply Efficiency >94%  
n
Flexible Auxiliary Power Interface  
Superior EMI Performance  
n
n
The PD controller features a 100V MOSFET that isolates  
the power supply during detection and classification, and  
provides 100mA inrush current limit. Also included are  
power good outputs, an undervoltage/overvoltage lock-  
out and thermal protection. The current mode forward  
controller allows for synchronous rectification, resulting  
in an extremely high efficiency, green product. Soft-start  
for controlled output voltage start-up and fault recovery is  
included.Programmablefrequencyover100kHzto500kHz  
allows flexibility in efficiency vs size and low EMI.  
Robust 100V 0.7Ω (Typ) Integrated Hot Swap™  
MOSFET  
n
Integrated Signature Resistor, Programmable Class  
Current, UVLO, OVLO and Thermal Protection  
n
Short-Circuit Protection with Auto-Restart  
n
Programmable Switching Frequency from  
100kHz to 500kHz  
n
Thermally Enhanced 7mm × 4mm DFN Package  
applicaTions  
n
IP Phones with Large Color Screens  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
Hot Swap, ThinSOT are trademarks of Linear Technology Corporation. All other trademarks  
are the property of their respective owners.  
n
Dual Radio 802.11n Access Points  
n
PTZ Security Cameras  
Typical applicaTion  
PoE-Based Self-Driven Synchronous Forward Power Supply  
1mH  
6.8µH  
5V  
5A  
+
10µH  
10µF  
5.1Ω  
220µF  
+
33k  
4.7nF  
2.2µF  
237k  
0.1µF  
V
CC  
+
10.0k  
10µF  
~ +  
~ –  
54V FROM  
DATA PAIR  
10k  
133Ω  
4.7nF  
SD_V  
SEC  
PORTP  
V
S
OUT  
PWRGD  
IN  
OUT  
V
CC  
2k  
~ +  
~ –  
V
OC  
54V FROM  
SPARE PAIR  
11.3k  
1.5k  
33k  
50mΩ  
0.1µF  
I
SENSE  
10nF  
22k  
LTC4269-2  
R
CLASS  
COMP  
FB  
0.1µF  
30.9Ω  
SHDN  
V
1.2k  
V
REF  
PORTN  
T2P V  
NEG  
PGND GND BLANK DELAY  
R
SS_MAXDC  
22.1k  
OSC  
TLV431  
3.65k  
0.22µF  
82k  
332k 158k  
158k  
TO  
42692 TA01  
MICRO-  
CONTROLLER  
42692fb  

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