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LT1249IN8

更新时间： 2024-11-22 22:15:39
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
12页 146K
描述
Power Factor Controller

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中文翻译

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LT1249IN8 数据手册

 浏览型号LT1249IN8的Datasheet PDF文件第2页浏览型号LT1249IN8的Datasheet PDF文件第3页浏览型号LT1249IN8的Datasheet PDF文件第4页浏览型号LT1249IN8的Datasheet PDF文件第5页浏览型号LT1249IN8的Datasheet PDF文件第6页浏览型号LT1249IN8的Datasheet PDF文件第7页 
LT1249  
Power Factor Controller  
U
FEATURES  
DESCRIPTIO  
The 8-pin LT®1249 provides active power factor correc-  
tion for universal offline power systems with very few  
externalparts.ByusingfixedhighfrequencyPWMcurrent  
averaging without the need for slope compensation, the  
LT1249 achieves far lower line current distortion, with a  
smallermagneticelementthansystemsthatuseeitherpeak  
current detection or zero current switching approach, in  
both continuous and discontinuous modes of operation.  
■
Standard 8-Pin Packages  
■
High Power Factor Over Wide Load Range  
with Line Current Averaging  
■
International Operation Without Switches  
■
Instantaneous Overvoltage Protection  
■
Minimal Line Current Dead Zone  
■
Typical 250µA Start-Up Supply Current  
■
Rejects Line Switching Noise  
■
Synchronization Capability  
The LT1249 uses a multiplier containing a square gain  
function from the voltage amplifier to reduce the AC gain  
at light output load and thus maintains low line current  
distortion and high system stability. The LT1249 also  
provides filtering capability to reject line switching noise  
which can cause instability when fed into the multiplier.  
Line current dead zone is minimized with low bias voltage  
at the current input to the multiplier.  
■
Low Quiescent Current: 9mA  
■
Fast 1.5A Peak Current Gate Driver  
U
APPLICATIO S  
■
Universal Power Factor Corrected Power Supplies  
Preregulators up to 1500W  
■
The LT1249 provides many protection features including  
peak current limiting and overvoltage protection. The  
switching frequency is internally set at 100kHz.  
While the LT1249 simplifies PFC design with minimal  
parts count, the LT1248 provides flexibilities in switching  
frequency, overvoltage and current limit.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
W
BLOCK DIAGRA  
CA  
M
GND  
1
V
VA  
OUT  
OUT  
3
CC  
7
OUT  
2
5
7.5V  
REF  
V
R
4k  
MOUT  
+
–
7.5V  
V
SENSE  
6
+
–
V
RUN  
EA  
CC  
I
I
A
250µA MAX  
16V/10V  
MULTIPLIER  
2 I  
I
M
I
AC  
32k  
1V  
+
I
A
B
I
=
B
M
4
200µA2  
–
+
CA  
–
R
S
Q
GTDR  
8
15µA  
+
g
= 1/3k  
RUN  
m
+
0.7V  
M1  
–
OSC  
+
–
SYNC  
4k  
16V  
44µA  
22µA  
20µA  
35pF  
1249 BD  
1
1234567...12

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