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LT1425

更新时间： 2023-12-20 18:46:14
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
20页 2295K
描述
隔离型反激式开关稳压器

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中文翻译

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LT1425 数据手册

 浏览型号LT1425的Datasheet PDF文件第2页浏览型号LT1425的Datasheet PDF文件第3页浏览型号LT1425的Datasheet PDF文件第4页浏览型号LT1425的Datasheet PDF文件第5页浏览型号LT1425的Datasheet PDF文件第6页浏览型号LT1425的Datasheet PDF文件第7页 
LT1425  
Isolated Flyback Switching Regulator  
FEATURES  
DESCRIPTION  
The LT®1425 is a monolithic high power switching regula-  
tor specifically designed for the isolated flyback topology.  
No “third winding” or optoisolator is required; the inte-  
grated circuit senses the isolated output voltage directly  
from the primary side flyback waveform. A high current,  
high efficiency switch is included on the die along with all  
oscillator, control and protection circuitry.  
n
No Transformer “Third Winding” or Optoisolator  
Required  
5ꢀ ꢁAAurate Output Voltage Without User Trims  
(See CirAuit Below)  
Resistor Programmable Output Voltage  
Regulation Maintained Well Into DisAontinuous  
Mode (Light Load)  
Optional Load Compensation  
Operating Frequency: 285kHz  
Easily Synchronized to External Clock  
Available in 16-Pin Narrow SO Package  
n
n
n
n
n
n
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The LT1425 operates with input supply voltages from  
3V to 20V and draws only 7mA quiescent current. It can  
deliver output power up to 6W with no external power  
devices. By utilizing current mode switching techniques,  
it provides excellent AC and DC line regulation.  
APPLICATIONS  
The LT1425 has a number of features not found on other  
switching regulator ICs. Its unique control circuitry can  
maintain regulation well into discontinuous mode in most  
applications. Optional load compensation circuitry allows  
for improved load regulation. An externally activated  
shutdown mode reduces total supply current to 15µA for  
standby operation.  
n
Isolated Flyback Switching Regulators  
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Ethernet Isolated 5V to –9V Converters  
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Medical Instruments  
Isolated Telecom Supplies  
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All registered trademarks and trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Load Regulation  
5V to Isolated –9VOUT  
ꢑ.ꢐ  
ꢑ.ꢔ  
ꢑ.ꢕ  
ꢑ.ꢖ  
500V  
ISOLATION BARRIER  
5V  
T1*  
–
V
+
C1  
100μF  
10V  
C2  
ISOLATED  
D1  
1N5819  
12  
47μF  
–9V 5% AT  
ꢑ.ꢗ  
ꢑ.ꢋ  
ꢏ.ꢑ  
ꢏ.ꢏ  
ꢏ.ꢒ  
ꢏ.ꢓ  
ꢏ.ꢐ  
+
16V  
20mA TO 200mA  
V
IN  
11  
3
•
•
V
SW  
R1  
22.6k  
1%  
F
LT1425  
*DALE LPE 4841-330MB  
15  
R
SHDN  
FB  
R2  
3.01k  
1%  
6
SYNC  
5
4
R
V
C
REF  
C3  
1000pF  
14  
13  
ꢋ
ꢐꢋ  
ꢗꢋꢋ  
ꢗꢐꢋ  
ꢖꢋꢋ  
R
OCOMP  
ꢀꢁꢂꢃꢁꢂ ꢄꢁRRꢅꢆꢂ ꢇꢈꢉꢊ  
R3  
15k  
R
CCOMP  
C4  
0.1μF  
ꢗꢔꢖꢐ ꢂꢉꢋꢖ  
SGND PGND  
10  
7
1425 TA01  
Rev. B  
1
Document Feedback  
For more information www.analog.com  
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