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750811291

更新时间： 2024-11-26 12:21:31
品牌 Logo 应用领域
凌特 - Linear 光电控制器
页数 文件大小 规格书
20页 257K
描述
Isolated No Opto-Coupler Flyback Controller

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中文翻译

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750811291 数据手册

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LT3798  
Isolated No Opto-Coupler  
Flyback Controller  
with Active PFC  
FEATURES  
DESCRIPTION  
ꢀhe Lꢀ®3798 is a constant-voltage/constant-current iso-  
lated flyback controller that combines active power factor  
correction (PFC) with no opto-coupler required for output  
voltage feedback into a single-stage converter. A Lꢀ3798  
baseddesigncanachieveapowerfactorofgreaterthan0.97  
by actively modulating the input current, allowing compli-  
ance with most Harmonic Current Emission requirements.  
n
Isolated PFC Flyback with Minimum Number of  
External Components  
n
V and V  
Limited Only by External Components  
IN  
OUT  
n
n
n
n
n
n
n
Active Power Factor Correction  
Low Harmonic Distortion  
No Opto-Coupler Required  
Constant-Current and Constant-Voltage Regulation  
Accurate Regulated Voltage and Current (±±5 ꢀypical)  
Energy Star Compliant (<0.±W No Load Operation)  
ꢀhermally Enhanced 16-lead MSOP Package  
ꢀhe Lꢀ3798 is well suited for a wide variety of off-line  
applications. ꢀhe input range can be scaled up or down,  
depending mainly on the choice of external components.  
Efficiencies higher than 865 can be achieved with output  
powerlevelsupto100W.Inaddition,theLꢀ3798caneasily  
be designed into high DC input applications.  
APPLICATIONS  
n
Offline ±W to 100W+ Applications  
n
High DC V Isolated Applications  
IN  
L, Lꢀ, LꢀC, LꢀM, Linear ꢀechnology and the Linear logo are registered trademarks of Linear  
ꢀechnology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including ±438499 and 7471±22.  
n
Offline Bus Converter (12V, 24V or 48V Outputs)  
TYPICAL APPLICATION  
Universal Input 24W PFC Bus Converter  
VOUT vs IOUT  
24.±0  
90V  
ꢀO 26±V  
AC  
24.2±  
499k  
499k  
100k  
100k  
D2  
20Ω  
24.00  
23.7±  
23.±0  
4:1:1  
0.1μF  
4.7pF  
10μF  
2k  
D3  
VAC = 90V  
VAC = 120V  
VAC = 220V  
VAC = 265V  
D4  
90.9k  
4.99k  
V
DCM  
FB  
IN  
24V  
1A  
1M  
V
IN_SENSE  
EN/UVLO  
Z1  
0
0.2  
0.4  
0.6  
(A)  
0.8  
1
±60μF  
× 2  
22pF  
9±.3k  
100k  
I
OUꢀ  
D1  
Lꢀ3798  
3798 ꢀA01b  
V
REF  
20Ω  
Z2  
40.2k  
16.±k  
CꢀRL3  
CꢀRL2  
GAꢀE  
SENSE  
INꢀV  
CC  
CꢀRL1  
OVP  
0.0±Ω  
4.7μF  
2.2nF  
GND  
–
221k  
+
VC  
COMP COMP  
0.1μF  
2.2μF  
3798 ꢀA01a  
3798f  
1
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