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LTC3873ETS8

更新时间： 2024-09-28 05:43:59
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管控制器
页数 文件大小 规格书
16页 176K
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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LTC3873ETS8 数据手册

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LTC3873  
TM  
No R  
Constant  
SENSE  
Frequency Current Mode  
Boost/Flyback/SEPIC  
DC/DC Controller  
FEATURES  
DESCRIPTION  
The LTC®3873 is a constant frequency current mode,  
boost, flyback or SEPIC DC/DC controller that drives an  
N-channel power MOSFET in high input and output volt-  
ageconverterapplications. Soft-startcanbeprogrammed  
using an external capacitor.  
n
V and V  
Limited Only by External Components  
IN  
OUT  
n
n
n
n
n
n
n
Internal or Programmable External Soft-Start  
Constant Frequency 200kHz Operation  
Adjustable Current Limit  
Current Sense Resistor Optional  
Maximum 60V on SW Node with R  
±±.ꢀ5 Voltage Reference Accuracy  
Current Mode Operation for Excellent Line and Load  
Transient Response  
Low Quiescent Current: 300ꢁA  
Sensing  
DS(ON)  
TheLTC3873provides±±.ꢀ5outputvoltageaccuracyand  
consumes only 300μA quiescent current during normal  
operation and only ꢀꢀμA during micropower start-up.  
Using a 9.3V internal shunt regulator, the LTC3873 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.  
n
n
Low Profile (±mm) ThinSOTTM and (0.7ꢀmm)  
2mm × 3mm DFN Package  
The LTC3873 is available in 8-lead ThinSOT and 2mm ×  
APPLICATIONS  
3mm DFN packages.  
PARAMETER  
LTC3873  
8.4V  
LTC3873-5  
3.9V  
n
Telecom Power Supplies  
42V and ±2V Automotive Power Supplies  
VCC UV+  
n
VCC UV–  
4V  
2.9V  
n
Portable Electronic Equipment  
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  
5V Output Nonisolated Telecom Power Supply  
V
IN  
36V TO 72V  
±00  
90  
3000  
D2  
V
OUT  
ꢀV  
T±  
EFFICIENCY  
•
2ꢀ00  
2000  
±ꢀ00  
±000  
ꢀ00  
±00ꢁF  
6.3V  
XꢀR  
s3  
2A MAX  
4.7ꢁF  
±00V  
XꢀR  
80  
22±k  
D±  
70  
•
±0ꢁF  
±0V  
XꢀR  
60  
ꢀ0  
V
CC  
POWER LOSS  
40  
30  
20  
±0  
0
M±  
I
NGATE  
LTC3873  
TH  
7.ꢀk  
2.2nF  
V
V
V
V
= 72V  
= 60V  
= 48V  
= 36V  
RUN/SS  
GND  
IN  
IN  
IN  
IN  
0.±ꢁF  
SW  
IPRG  
68mΩ  
±0  
±000  
V
FB  
±0  
±2.±k  
38.3k  
LOAD CURRENT (mA)  
3873 TA0±a  
3873 TA0±b  
3873fa  
1
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