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LT3512_11

更新时间： 2024-01-29 16:33:54
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
24页 227K
描述
Monolithic High Voltage Isolated Flyback Converter

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中文翻译

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LT3512_11 数据手册

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LT3512  
Monolithic High Voltage  
Isolated Flyback Converter  
FEATURES  
DESCRIPTION  
n
4.5V to 100V Input Voltage Range  
The LT3512 is a high voltage monolithic switching regula-  
tor specifically designed for the isolated flyback topology.  
No third winding or opto-isolator is required for regula-  
tion as the part senses output voltage directly from the  
primary-side flyback waveform. The device integrates a  
420mA, 150V power switch, high voltage circuitry, and  
control into a high voltage 16-lead MSOP package with  
four leads removed.  
n
Internal 420mA, 150V Power Switch  
n
Boundary Mode Operation  
n
No Transformer Third Winding or  
Opto-Isolator Required for Regulation  
n
Improved Primary-Side Winding Feedback  
Load Regulation  
n
V
Set with Two External Resistors  
OUT  
n
BIAS Pin for Internal Bias Supply and Power  
The LT3512 operates from an input voltage range of 4.5V  
to 100V and delivers up to 4.5W of isolated output power.  
Two external resistors and the transformer turns ratio  
easily set the output voltage. Off-the-shelf transformers  
are available for several applications. The high level of  
integrationandtheuseofboundarymodeoperationresults  
in a simple, clean, tightly regulated application solution to  
the traditionally tough problem of isolated power delivery.  
Switch Driver  
n
n
No External Start-Up Resistor  
16-Lead MSOP Package  
APPLICATIONS  
n
Isolated Telecom Power Supplies  
n
Isolated Auxiliary/Housekeeping Power Supplies  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
n
Isolated Industrial, Automotive and Medical Power  
Supplies  
and No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522.  
TYPICAL APPLICATION  
48V to 5V Isolated Flyback Converter  
Output Load and Line Regulation  
V
5.25  
5.20  
5.15  
5.10  
5.05  
5.00  
4.95  
4.90  
4.85  
4.80  
4.75  
+
–
IN  
V
OUT  
4:1  
36V TO 72V  
5V  
1μF  
1M  
0.5A  
V
t
IN  
EN/UVLO  
175μH  
11μH  
47μF  
t
43.2k  
V
= 48V  
IN  
V
= 36V  
169k  
IN  
V
LT3512  
OUT  
R
FB  
R
REF  
10k  
V
= 72V  
IN  
T
SW  
C
VC  
GND BIAS  
57.6k  
12.7k  
4.7nF  
0
200  
300  
400  
500  
100  
4.7μF  
LOAD CURRENT (mA)  
3512 TA01a  
3512 TA01b  
3512f  
1
1234567...24

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