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LTC3873EDDB-5-TRPBF PDF预览

LTC3873EDDB-5-TRPBF

更新时间： 2024-09-28 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 170K
描述
No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

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中文翻译

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LTC3873EDDB-5-TRPBF 数据手册

 浏览型号LTC3873EDDB-5-TRPBF的Datasheet PDF文件第2页浏览型号LTC3873EDDB-5-TRPBF的Datasheet PDF文件第3页浏览型号LTC3873EDDB-5-TRPBF的Datasheet PDF文件第4页浏览型号LTC3873EDDB-5-TRPBF的Datasheet PDF文件第5页浏览型号LTC3873EDDB-5-TRPBF的Datasheet PDF文件第6页浏览型号LTC3873EDDB-5-TRPBF的Datasheet PDF文件第7页 
LTC3873-5  
TM  
No R  
Constant  
SENSE  
Frequency Current Mode  
Boost/Flyback/SEPIC  
DC/DC Controller  
FEATURES  
DESCRIPTION  
The LTC®3873-5 is a constant frequency current mode  
controller for boost, flyback or SEPIC DC/DC converters  
designed to drive an N-channel MOSFET for high input  
and output voltage converter applications.  
n
V and V  
Limited Only by External Components  
IN  
OUT  
n
n
n
n
n
n
Internal or Programmable External Soft-Start  
Constant Frequency 200kHz Operation  
Adjustable Current Limit  
Current Sense Resistor Optional  
±±.5ꢀ Voltage Reference Accuracy  
Current Mode Operation for Excellent Line and Load  
Transient Response  
The LTC3873-5 provides ±±.5ꢀ output voltage accuracy  
and consumes only 300μA quiescent current during nor-  
mal operation and only 50μA during micropower start-up.  
Using a 9.3V internal shunt regulator, the LTC3873-5 can  
be powered from a high input voltage through a resistor  
or it can be powered directly from a low impedance DC  
voltage of 9V or less. Soft-start can be programmed using  
an external capacitor.  
n
4.±V Undervoltage Threshold for Logic Level  
MOSFET Applications  
n
n
Low Quiescent Current: 300ꢁA  
Low Profile (±mm) ThinSOTTM and (0.75mm)  
2mm × 3mm DFN Package  
The LTC3873-5 is available in 8-lead ThinSOT and 2mm  
× 3mm DFN packages.  
APPLICATIONS  
PARAMETER  
LTC3873  
8.4V  
LTC3873-5  
4.±V  
n
Telecom Power Supplies  
VCC UV+  
n
Automotive Power Supplies  
VCC UV–  
4V  
2.9V  
n
PoE Applications  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
No R  
and ThinSOT are trademarks of Linear Technology Corporation.  
SENSE  
All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Efficiency and Power Loss vs Load Current  
High Efficiency 5V Input, 12V Output Boost Converter  
±00  
90  
±0000  
±nF  
4.7nF  
80  
RUN/SS  
±±.8k  
47pF  
V
IN  
I
V
CC  
TH  
70  
5V  
±000  
±00  
±0  
±0ꢁF  
22ꢁF  
LTC3873-5  
60  
50  
±0ꢁH  
IPRG  
GND  
V
±2V  
2A  
OUT  
SW  
40  
30  
20  
±0  
0
±2k  
V
NGATE  
FB  
±08k  
38735 TA0±a  
±0  
±00  
±000  
I
(mA)  
OUT  
3873 TA0±b  
38735fb  
1
1234567...16

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