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LTC3706

更新时间： 2024-09-16 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
20页 189K
描述
Secondary-Side Synchronous Forward Controller with PolyPhase Capability

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中文翻译

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LTC3706 数据手册

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LTC3706  
Secondary-Side Synchronous  
Forward Controller with  
PolyPhase Capability  
DESCRIPTION  
The LTC®3706 is a PolyPhase capable secondary-side  
controllerforsynchronousforwardconverters.Whenused  
in conjunction with the LTC3705 gate driver and primary-  
side controller, the part creates a complete isolated power  
supply that combines the power of PolyPhase operation  
with the speed of secondary-side control.  
FEATURES  
n
Secondary-Side Control for Fast Transient Response  
n
Self-Starting Architecture Eliminates Need for  
Separate Bias Regulator  
n
Proprietary Gate Drive Encoding Scheme Reduces  
System Complexity  
PolyPhase® Operation Reduces C Requirements  
n
IN  
n
Current Mode Control Ensures Current Sharing  
The LTC3706 has been designed to simplify the design  
of highly efficient, secondary-side forward converters.  
Working in concert with the LTC3705, the LTC3706 forms  
a robust, self-starting converter that eliminates the need  
for the separate bias regulator that is commonly used in  
secondary-side control applications. In addition, a pro-  
prietary scheme is used to multiplex gate drive signals  
and DC bias power across the isolation barrier through a  
single, tiny pulse transformer.  
n
PLL Fixed Frequency: 100kHz to 500kHz  
n
1% Output Voltage Accuracy  
n
True Remote Sense Differential Amplifier  
n
Power Good Output Voltage Monitor  
n
High Voltage Linear Regulator Controller  
n
Wide Supply Range: 5V to 30V  
n
Available in a Narrow 24-Lead SSOP Package  
APPLICATIONS  
The LTC3706 provides remote sensing, accurate power  
goodandovervoltagemonitoringcircuitstosupportpreci-  
sion,highcurrentapplications.Alinearregulatorcontroller  
with thermal protection is also provided to simplify the  
generation of secondary-side bias voltage.  
n
Isolated 48V Telecommunication Systems  
n
Internet Servers and Routers  
n
Distributed Power Step-Down Converters  
Automotive and Heavy Equipment  
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
PolyPhase is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
The LTC3706 is available in a 24-lead SSOP package.  
Protected by U.S. Patents including 6144194, other patents pending.  
TYPICAL APPLICATION  
36V-72V to 3.3V/20A Isolated Forward Converter  
+
+
V
V
OUT  
IN  
T1  
L1  
1.2μH  
•
•
Si7852DP  
1.2Ω  
MURS120  
Si7852DP  
Si7336ADP  
s2  
1μF  
100V  
s3  
330μF  
6.3V  
s3  
Si7336ADP  
MURS120  
CMPSH1-4  
2mΩ  
2W  
30mΩ  
1W  
10μF  
25V  
–
–
V
V
OUT  
IN  
CZT3019  
100k  
BAS21  
2.2μF  
16V  
102k  
1%  
FQT7N10  
L1: COILCRAFT SER2010-122  
T1: PULSE PA0807  
0.22μF  
T2: PULSE PA0297  
FG  
SW SG  
V
NDRV  
V
CC  
IN  
–
+
I
I
S
S
365k  
1%  
FS/SYNC  
1μF  
NDRV  
UVLO  
BOOST TG TS BG IS  
T2  
+
+
FB  
FB/IN  
PT  
•
•
LTC3706  
ITH  
680pF  
LTC3705  
V
CC  
2.2μF  
25V  
–
–
FS/IN  
PT  
SS/FLT  
22.6k  
1%  
RUN/SS GND PGND PHASE SLP MODE REGSD  
GND PGND VSLMT  
15k  
1%  
20k  
162k  
33nF  
33nF  
3706 TA01  
3706fb  
1
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中文翻译

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