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LT1425 PDF预览

LT1425

更新时间： 2024-09-29 22:51:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 344K
描述
Isolated Flyback Switching Regulator

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中文翻译

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LT1425 数据手册

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LT1425  
Isolated Flyback  
Switching Regulator  
U
FEATURES  
DESCRIPTION  
The LT®1425 is a monolithic high power switching regu-  
lator specifically designed for the isolated flyback topol-  
ogy. No “third winding” or optoisolator is required; the  
integrated 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.  
■
No Transformer “Third Winding” or Optoisolator  
Required  
■
±5% Accurate Output Voltage Without User Trims  
(See Circuit Below)  
Resistor Programmable Output Voltage  
■
■
Regulation Maintained Well Into Discontinuous  
Mode (Light Load)  
■
Optional Load Compensation  
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. Byutilizingcurrentmodeswitchingtechniques, it  
provides excellent AC and DC line regulation.  
■
Operating Frequency: 285kHz  
■
Easily Synchronized to External Clock  
■
Available in 16-Pin Narrow SO Package  
U
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 shut-  
down mode reduces total supply current to 15µA for  
standby operation.  
■
Isolated Flyback Switching Regulators  
■
Ethernet Isolated 5V to –9V Converters  
■
Medical Instruments  
Isolated Telecom Supplies  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
5V to Isolated –9VOUT  
Load Regulation  
500V  
9.5  
9.4  
9.3  
9.2  
9.1  
9.0  
8.9  
8.8  
8.7  
8.6  
8.5  
ISOLATION BARRIER  
5V  
T1*  
–
V
+
C1  
100µF  
10V  
C2  
ISOLATED  
–9V ±5% AT  
20mA TO 200mA  
D1  
1N5819  
12  
47µF  
+
16V  
V
IN  
11  
3
•
•
V
SW  
R1  
22.6k  
1%  
F
LT1425  
*DALE LPE 4841-330MB  
15  
R
FB  
SHDN  
R2  
3.01k  
1%  
6
SYNC  
5
4
R
V
C
REF  
C3  
1000pF  
14  
13  
R
OCOMP  
0
50  
100  
150  
200  
R3  
15k  
R
CCOMP  
C4  
0.1µF  
OUTPUT CURRENT (mA)  
SGND PGND  
10  
1425 TA02  
7
1425 TA01  
1
1234567...20

中文翻译

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