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LT3710

更新时间： 2024-09-13 22:46:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
12页 220K
描述
Secondary Side Synchronous Post Regulator

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中文翻译

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LT3710 数据手册

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LT3710  
Secondary Side  
Synchronous Post Regulator  
U
FEATURES  
DESCRIPTIO  
The LT®3710 is a high efficiency step-down switching  
regulator intended for auxiliary outputs in single second-  
ary winding, multiple output power supplies.  
■
Generates a Regulated Auxiliary Output in Isolated  
DC/DC Converters  
■
0.8V ±1.5% Accurate Voltage Reference  
■
Dual N-Channel MOSFET Synchronous Drivers  
TheLT3710drivesdualsynchronousN-channelMOSFETs  
and achieves high efficiency. With leading edge modula-  
tion, it operates well with either primary side peak current  
or voltage mode control. It is synchronized to the falling  
edge of the transformer secondary winding and can be  
used in both single-ended and double-ended isolated  
power converter topologies. A high speed operational  
amplifier is incorporated to achieve optimum compensa-  
tion and fast transient response. A user selectable discon-  
tinuous conduction mode improves light load efficiency.  
■
High Switching Frequency: Up to 500kHz  
■
Programmable Current Limit Protection  
■
Programmable Soft-Start  
■
Automatic Frequency Synchronization  
■
Small 16-Pin Thermally Enhanced TSSOP Package  
U
APPLICATIO S  
■
48V Isolated DC/DC Converters  
■
Multiple Output Supplies  
TheLT3710isavailableinathermallyenhancedTSSOP-16  
exposed pad power package.  
■
Offline Converters  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
L1  
V
OUT1  
3.3V  
AT 10A  
V
V
CC  
BIAS  
IN  
36V  
TO 72V  
10k  
V
V
CC  
BOOST  
CMDSH-3  
DD  
SYNC GBIAS  
V
COMP  
•
•
10pF  
4.7µF  
CG  
FG  
LT3710  
L2  
Q1  
Q2  
V
FB  
CSET  
TG  
C
S
1.8µH  
V
0.006Ω  
OUT2  
680pF  
0.1µF  
1.8V  
SW  
AT 10A  
+
I
SNS  
LTC1698  
C
OUT2  
4700pF  
3.01k  
B340A  
ILCOMP BG  
SS  
VA  
OUT  
10k  
180pF  
0.01µF  
3.3k  
BGS  
220Ω  
SYNC  
TG BG  
LT3781  
SG  
33nF  
•
•
PGND  
CL  
V
FB  
CL  
–
+
2.32k  
3710 F01  
OPTODRV  
GND  
V
V
REF  
+
–
V
C
FB  
C
: POSCAP, 680µF/4V  
PLEASE REFER TO FIGURE 3  
IN THE APPLICATIONS SECTION  
FOR THE COMPLETE SCHEMATIC  
OUT2  
ISOLATION  
BOUNDARY  
L2: SUMIDA CEP125-IR8MC-H  
Q1, Q2: SILICONIX Si7440DP  
Figure 1. Simplified Single Secondary Winding 3.3V and 1.8V Output Isolated DC/DC Converter  
3710f  
1
1234567...12

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