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LT8302

更新时间： 2023-12-20 18:45:50
品牌 Logo 应用领域
亚德诺 - ADI 开关转换器
页数 文件大小 规格书
26页 1539K
描述
具有 65V/3.6A 开关的 42VIN 微功率 No-Opto 隔离型反激式转换器

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LT8302 数据手册

 浏览型号LT8302的Datasheet PDF文件第2页浏览型号LT8302的Datasheet PDF文件第3页浏览型号LT8302的Datasheet PDF文件第4页浏览型号LT8302的Datasheet PDF文件第5页浏览型号LT8302的Datasheet PDF文件第6页浏览型号LT8302的Datasheet PDF文件第7页 
LT8302/LT8302-3  
42V Micropower No-Opto  
IN  
Isolated Flyback Converter  
with 65V/3.6A Switch  
FEATURES  
DESCRIPTION  
The LT®8302/LT8302-3 is a monolithic micropower iso-  
lated flyback converter. By sampling the isolated output  
voltage directly from the primary-side flyback waveform,  
the part requires no third winding or opto-isolator for  
regulation. The output voltage is programmed with two  
external resistors and a third optional temperature com-  
pensation resistor. Boundary mode operation provides a  
small magnetic solution with excellent load regulation.  
Low ripple Burst Mode operation maintains high efficiency  
at light load while minimizing the output voltage ripple. A  
3.6A, 65V DMOS power switch is integrated along with all  
the high voltage circuitry and control logic into a thermally  
enhanced 8-lead SO package.  
n
3V to 42V Input Voltage Range  
n
3.6A, 65V Internal DMOS Power Switch  
n
Low Quiescent Current:  
n
106µA in Sleep Mode  
380µA in Active Mode  
n
n
Quasi-Resonant Boundary Mode Operation at  
Heavy Load  
Low Ripple Burst Mode® Operation at Light Load  
n
n
Minimum Load < 0.5% (Typ) of Full Output  
n
No Transformer Third Winding or Opto-Isolator  
Required for Output Voltage Regulation  
n
Accurate EN/UVLO Threshold and Hysteresis  
n
Internal Compensation and Soft-Start  
n
Temperature Compensation for Output Diode  
The LT8302/LT8302-3 operates from an input voltage  
range of 3V to 42V and delivers up to 18W of isolated  
output power. The high level of integration and the use of  
boundary and low ripple burst modes result in a simple to  
use, low component count, and high efficiency application  
solution for isolated power delivery.  
n
Output Short-Circuit Protection  
n
Thermally Enhanced 8-Lead SO Package  
n
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 5438499, 7463497, 7471522.  
Isolated Automotive, Industrial, Medical  
Power Supplies  
n
Isolated Auxiliary/Housekeeping Power Supplies  
TYPICAL APPLICATION  
3V to 32VIN/5VOUT Isolated Flyback Converter  
Efficiency vs Load Current  
ꢒꢋ  
+
V
V
IN  
OUT  
3V TO 32V  
3:1  
5V  
470pF  
9µH  
ꢐꢑ  
•
220µF  
1µH  
39Ω  
V
IN  
•
ꢐꢋ  
10µF  
–
V
EN/UVLO  
SW  
OUT  
LT8302/LT8302-3  
154k  
ꢗꢑ  
GND  
INTV  
R
FB  
10mA TO 1.1A (V = 5V)  
IN  
10mA TO 2.0A (V = 12V)  
IN  
R
REF  
ꢗꢋ  
ꢘꢑ  
ꢘꢋ  
CC  
10mA TO 2.9A (V = 24V)  
IN  
1µF  
115k  
10k  
ꢙ
ꢙ
ꢙ
ꢚ ꢑꢙ  
ꢚ ꢓꢔꢙ  
ꢚ ꢔꢛꢙ  
ꢍꢇ  
ꢍꢇ  
ꢍꢇ  
TC  
8302 TA01a  
ꢔ.ꢋ  
ꢀꢁꢂꢃ ꢄꢅRRꢆꢇꢈ ꢉꢂꢊ  
ꢕ.ꢋ  
ꢋ
ꢋ.ꢑ  
ꢓ.ꢋ  
ꢓ.ꢑ  
ꢔ.ꢑ  
ꢐꢕꢋꢔ ꢈꢂꢋꢓꢖ  
Rev. G  
1
Document Feedback  
For more information www.analog.com  
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