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14245

更新时间: 2024-11-07 05:56:11
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
16页 191K
描述
Isolated Flyback Switching Regulator with 5V Output

14245 数据手册

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LT1424-5  
Isolated Flyback  
Switching Regulator  
with 5V Output  
U
FEATURES  
DESCRIPTIO  
The LT®1424-5 is a monolithic high power switching  
regulator specifically designed for the isolated flyback  
topology. 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  
Designed for Use with 1:1 Ratio Transformers  
Fixed, Application Specific 5V Output Voltage  
Regulation Maintained Well into Discontinuous  
Mode (Light Load)  
Load Compensation Provides Excellent  
Load Regulation  
The LT1424-5 operates with input supply voltages from  
3V to 20V and draws only 7mA quiescent current. It can  
deliver up to 400mA at 5V with no external power devices.  
By utilizing current mode switching techniques, it pro-  
vides excellent AC and DC line regulation.  
Available in 8-Pin PDIP and SO Packages  
Operating Frequency: 285kHz  
U
APPLICATIO S  
TheLT1424-5hasanumberoffeaturesnotfoundonother  
switching regulator ICs. Its unique control circuitry can  
maintain regulation well into discontinuous mode. Load  
compensation circuitry allows for improved load regula-  
tion. An externally activated shutdown mode reduces total  
supply current to 20µA typical for standby operation.  
Isolated Communication Supplies  
Industrial Automation  
Instrumentation Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
5V Output Isolated Power Supply  
Load Regulation  
5.25  
330pF  
47Ω  
ISOLATION  
BARRIER  
MBRS130LT3  
5V  
T1  
5V  
400mA  
+
C1  
100µF  
10V  
0.1µF  
6
3
4
1N5248  
47Ω  
330pF  
5.00  
+
C2  
1
2
8
7
SHDN  
R
1.8k  
100µF  
CCOMP  
V
IN  
10V  
V
C
MBR0540T4  
7
LT1424-5  
1
2
3
4
6
5
OUT  
COM  
SYNC  
SGND  
V
SW  
PGND  
1000pF  
1424-5 TA01  
0.1µF  
C1, C2: AVX TPS D107M010R0080  
T1: DALE LPE-4841-A307  
INPUT  
COM  
4.75  
0
100  
200  
300  
400  
OUTPUT CURRENT (mA)  
1424-5 TA02  
sn14245 14245fs  
1

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