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LT3837

更新时间： 2024-09-24 14:57:55
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
28页 316K
描述
隔离型无光隔离器同步反激式控制器

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中文翻译

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LT3837 数据手册

 浏览型号LT3837的Datasheet PDF文件第2页浏览型号LT3837的Datasheet PDF文件第3页浏览型号LT3837的Datasheet PDF文件第4页浏览型号LT3837的Datasheet PDF文件第5页浏览型号LT3837的Datasheet PDF文件第6页浏览型号LT3837的Datasheet PDF文件第7页 
LT3837  
Isolated No-Opto  
Synchronous Flyback Controller  
FEATURES  
DESCRIPTION  
The LT®3837 is an isolated switching regulator controller  
designed for medium power flyback topologies. A typical  
application is 10W to 60W with the part powered from a  
DC supply.  
n
Senses Output Voltage Directly from Primary Side  
Winding—No Optoisolator Required  
Synchronous Driver for High Efficiency  
Supply Voltage Range 4.5V to 20V  
Accurate Regulation Without User Trims  
Programmable Switching Frequency from  
50kHz to 250kHz  
n
n
n
n
The LT3837 is a current mode controller that regulates an  
output voltage based on sensing the secondary voltage  
via a transformer winding during flyback. This allows for  
tight output regulation without the use of an optoisolator,  
improving dynamic response and reliability. Synchronous  
rectification increases converter efficiency and improves  
output cross regulation in multiple output converters.  
n
n
n
n
Synchronizable  
Load Compensation  
Undervoltage Lockout  
Available in a Thermally Enhanced 16-Lead  
TSSOP Package  
The LT3837 operates in forced continuous conduction  
modewhichimprovescrossregulationinmultiplewinding  
applications. Switching frequency is user programmable  
and can be externally synchronized. The part also has load  
compensation, undervoltage lockout and soft-start circuitry.  
APPLICATIONS  
n
Isolated Medium Power (10W to 60W) Supplies  
n
Instrumentation Power Supplies  
Isolated Medical Supplies  
n
The LT3837 is available in a thermally enhanced 16-pin  
TSSOP package.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 6498466, 5841643.  
Efficiency vs Load Current  
TYPICAL APPLICATION  
90  
18V  
9V  
IN  
IN  
88  
9V –18V to 3.3V at 10A Isolated Converter  
86  
84  
82  
80  
V
IN  
22.1k  
10µF  
BAS16  
22µF  
100nH  
OUTPUT 3.3V/10A  
220µF  
2N3906  
•
47µF × 3  
2.2nF  
10Ω  
86.6k  
15k  
V
CC  
78  
76  
•
FB  
UVLO  
B0540W  
V
C
2
5
7
8
9
10  
3
4
6
3k  
1nF  
10Ω  
LT3837  
3837 TA01b  
LOAD CURRENT (A)  
47pF  
20k  
OSC  
SFST  
FMMT618  
1µF  
Regulation vs Load Current  
Si7336ADP  
3.3nF  
3.60  
3.50  
3.40  
3.30  
3.20  
3.10  
3.00  
Si7852DP  
PG  
+
100k  
12k  
FMMT718  
t
ON  
150k  
SENSE  
ENDLY  
PGDLY  
8mΩ  
0.1µF  
–
1.37k  
SENSE  
R
CMP  
2.2nF  
9V  
IN  
330Ω  
15Ω  
0.1µF  
SG  
C
18V  
CMP  
•
•
IN  
GND  
10k  
BAT54  
3837 TA01a  
2
5
7
8
9
10  
3
4
6
3837 TA01c  
LOAD CURRENT (A)  
3837fd  
1
1234567...28

中文翻译

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