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LT3574IMSTRPBF PDF预览

LT3574IMSTRPBF

更新时间： 2024-09-18 05:43:31
品牌 Logo 应用领域
凌特 - Linear 转换器光电
页数 文件大小 规格书
24页 284K
描述
Isolated Flyback Converter Without an Opto-Coupler

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中文翻译

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LT3574IMSTRPBF 数据手册

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LT3574  
Isolated Flyback Converter  
Without an Opto-Coupler  
Features  
Description  
The LT®3574 is a monolithic switching regulator specifi-  
cally designed for the isolated flyback topology. No third  
winding or opto-isolator is required for regulation. The  
part senses the isolated output voltage directly from the  
primary side flyback waveform. A 0.65A, 60V NPN power  
switch is integrated along with all control logic into a  
16-lead MSOP package.  
n
3V to 40V Input Voltage Range  
n
0.65A, 60V Integrated NPN 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  
The LT3574 operates with input supply voltages from  
3V to 40V, and can deliver output power up to 3W with  
no external power switch. The LT3574 utilizes boundary  
mode operation to provide a small magnetic solution with  
improved load regulation.  
n
BIAS Pin for Internal Bias Supply and Power  
NPN Driver  
Programmable Soft-Start  
n
n
n
Programmable Power Switch Current Limit  
16-Lead MSOP Package  
The output voltage is easily set with two external resistors  
andthetransformerturnsratio.Off-the-shelftransformers  
are available for many applications.  
applications  
n
Industrial, Automotive and Medical Isolated  
Power Supplies  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
and No R  
and ThinSOT are trademarks of Linear Technology Corporation. All other  
SENSE  
trademarks are the property of their respective owners.  
typical application  
5V Isolated Flyback Converter  
Load Regulation  
V
IN  
B340A  
5.6µH  
+
12V TO 24V  
V
OUT  
1.0  
0.5  
0
10µF  
3:1  
5V  
0.35A  
22µF  
357k  
0.22µF  
2k  
V
IN  
•
50µH  
SHDN/UVLO  
V
= 24V  
IN  
•
51.1k  
PMEG6010  
80.6k  
–
V
OUT  
V
= 12V  
IN  
R
FB  
LT3574  
R
REF  
TC  
6.04k  
R
ILIM  
–0.5  
SS  
SW  
VC  
GND TEST BIAS  
10k  
59k  
1nF  
–1.0  
28.7k  
0
100 200 300 400 500 600 700  
(mA)  
I
4.7µF  
10nF  
OUT  
3574 TA01b  
3574 TA01  
3574f  
ꢀ
1234567...24

中文翻译

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