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LTC1698

更新时间： 2023-12-20 18:45:55
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
24页 1052K
描述
隔离式副端同步整流器控制器

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中文翻译

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LTC1698 数据手册

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LTC1698  
Isolated Secondary  
Synchronous Rectifier Controller  
U
FEATURES  
DESCRIPTIO  
The LTC®1698 is a precision secondary-side forward  
converter controller that synchronously drives external  
N-channel MOSFETs. It is designed for use with the  
LT®3781 primary-side synchronous forward converter  
controller to create a completely isolated power supply.  
The LT3781 synchronizes the LTC1698 through a small  
pulse transformer and the LTC1698 drives a feedback  
optocoupler to close the feedback loop. Output accuracy  
of ±0.8% and high efficiency over a wide range of load  
currents are obtained.  
■
High Efficiency Over Wide Load Current Range  
■
±0.8% Output Voltage Accuracy  
■
Dual N-Channel MOSFET Synchronous Drivers  
■
Pulse Transformer Synchronization  
■
Optocoupler Feedback Driver  
■
Programmable Current Limit Protection  
■
±5% Margin Output Voltage Adjustment  
■
Adjustable Overvoltage Fault Protection  
■
Power Good Flag  
Auxiliary 3.3V Logic Supply  
■
■
Available in 16-LUead SSOP and SO Packages  
The LTC1698 provides accurate secondary-side current  
limit using an external current sense resistor. The input  
voltage at the MARGIN pin provides ±5% output voltage  
adjustment. A power good flag and overvoltage input are  
provided to ensure proper power supply conditions. An  
auxiliary 3.3V logic supply is included that supplies up to  
10mA of output current.  
APPLICATIO S  
■
48V Input Isolated DC/DC Converters  
■
Isolated Telecommunication Power Systems  
■
Distributed Power Step-Down Converters  
■
Industrial Control Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Automotive and Heavy Equipment  
U
TYPICAL APPLICATIO  
L1  
V
IN  
36V to 72V  
V
OUT  
+
R2  
C
OUT  
Q1  
R1  
V
BIAS  
DD  
+
D1  
1
10  
T1  
R
C
R5  
V
PWRGD  
V
C
DD  
2
8
6
Q4  
Q3  
CG  
FB  
C
C
16  
Q2  
D2  
FG  
LTC1698  
C
FB  
12  
R
V
I
PRISEN  
COMP  
I
SNS  
R
SECSEN  
C
CILM  
R
CILM  
11  
15  
13  
9
I
SNSGND  
COMP  
C
SG  
SYNC  
TG BG  
SYNC  
OVPIN  
SG  
R4  
T2  
R
SYNC  
7
MARGIN  
V
MARGIN  
LT3781  
R
V
K
AUX  
14  
5
OPTODRV  
PGND  
3
V
3.3V  
AUX  
C
K
10mA  
O.1µF  
+
–
REF  
FB  
GND  
V
4
1681 F01  
V
C
R
E
R
F
C
F
ISOLATION  
BOUNDARY  
PLEASE REFER TO FIGURE 12 IN THE TYPICAL APPLICATIONS  
SECTION FOR THE COMPLETE 3.3V/15A APPLICATION SCHEMATIC  
Figure 1. Simplified 2-Transistor Isolated Forward Converter  
1698f  
1
1234567...24

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