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LTC3766

更新时间： 2024-09-25 01:22:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
48页 732K
描述
Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters

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中文翻译

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LTC3766 数据手册

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LT8311  
Synchronous Rectifier  
Controller with Opto-Coupler  
Driver for Forward Converters  
DESCRIPTION  
FEATURES  
The LT®8311 is used on the secondary side of a forward  
converter to provide synchronous MOSFET control and  
output voltage feedback through an opto-coupler. The  
LT8311’s unique preactive mode allows control of the  
secondary-side MOSFETs without requiring a traditional  
pulse transformer for primary- to secondary-side com-  
munication.Inpreactivemode,theoutputinductorcurrent  
operates in discontinuous conduction mode (DCM) at  
light load. If forced continuous mode (FCM) operation is  
desiredatlightload,theLT8311can,alternatively,beused  
in SYNC mode, where a pulse transformer is required to  
send synchronous control signals from the primary-side  
IC to the LT8311.  
n
Wide Input Supply Range: 3.7V to 30V  
n
Preactive Mode:  
n
No Pulse Transformer Required  
n
DCM Operation at Light Load  
n
SYNC Mode:  
n
FCM or DCM Operation at Light Load  
Achieves Highest Efficiency  
n
n
1.5% Feedback Voltage Reference  
10mA Opto-Coupler Driver  
Output Power Good Indicator  
n
n
n
Integrated Soft-Start Function  
APPLICATIONS  
n
Offline and HV Car Battery Isolated Power Supplies  
The LT8311 offers a full featured opto-coupler controller,  
incorporating a 1.5% reference, a transconductance error  
amplifieranda10mAopto-driver. Powergoodmonitoring  
and output soft-start/overshoot control are also included.  
The LT8311 is available in a 16-lead FE package with pins  
removed for high voltage spacing requirements.  
n
48V Isolated Power Supplies  
n
Industrial, Automotive and Military Systems  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
18V to 72V, 12V/8A Active Clamp Isolated Forward Converter  
4:4  
6.8µH  
V
V
OUT  
IN  
18V to  
72V  
12V  
+
4.7µF  
× 3  
68pF  
22µF  
× 2  
20k  
•
•
100k  
470µF  
V
IN  
2.2µF  
100V  
UVLO_VSEC  
OVLO  
100nF  
2.2nF  
100k  
2k  
5.9k  
100nF  
FSW  
FG  
AOUT  
OUT  
FB  
2k  
11.3k  
1.82k  
CSW  
LT3753  
10k  
LT8311  
1.78k  
CSP  
CG  
IVSEC  
RT  
SYNC  
V
IN  
V
OUT  
240kHz  
2k  
71.5k  
100k  
1.78k  
1.5k  
ISENSEP  
OC  
31.6k  
CSN  
PGOOD  
INTV  
S
OUT  
6mΩ  
OPTO  
COMP  
SYNC  
SS  
CC  
TAO  
ISENSEN  
4.7µF  
TAS  
TOS  
TBLNK  
GND SS1  
PMODE  
TIMER GND  
15nF  
49.9k  
INTV  
CC  
COMP  
SS2 FB  
2.2µF  
100Ω  
4.7µF  
100k  
100k  
124k  
1µF  
2.94k  
10pF  
1µF  
0.47µF  
34k  
1µF  
8311 TA01  
1k  
2.2nF  
8311f  
1
For more information www.linear.com/LT8311  
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