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LT3781

更新时间： 2023-12-20 18:45:01
品牌 Logo 应用领域
亚德诺 - ADI 控制器晶体管
页数 文件大小 规格书
20页 254K
描述
?自举起动双晶体管同步正激式控制器

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中文翻译

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LT3781 数据手册

 浏览型号LT3781的Datasheet PDF文件第2页浏览型号LT3781的Datasheet PDF文件第3页浏览型号LT3781的Datasheet PDF文件第4页浏览型号LT3781的Datasheet PDF文件第5页浏览型号LT3781的Datasheet PDF文件第6页浏览型号LT3781的Datasheet PDF文件第7页 
LT3781  
“Bootstrap” Start Dual  
Transistor Synchronous Forward Controller  
U
FEATURES  
DESCRIPTIO  
The LT®3781 controller simplifies the design of high  
power synchronous dual transistor forward DC/DC con-  
verters. The part employs fixed frequency current mode  
control and supports both isolated and nonisolated to-  
pologies.TheIC drivesexternalN-channelpowerMOSFETs  
and operates with input voltages up to 72V.  
■
High Voltage Operation up to 72V  
Synchronizable Operating Frequency and Output  
Switch Phase for Multiple Controller Systems  
Synchronous Switch Output  
■
■
■
Undervoltage Lockout Protection with 6V Hysteresis  
for Self-Biased Power  
■
■
■
■
■
Fixed Frequency Operation to 350kHz  
Local ±1% Voltage Reference  
The LT3781 is ideal for output derived power schemes,  
through the use of a large undervoltage lockout hysteresis  
range. The part is also equipped with an 18V VCC shunt  
regulator, which prevents exceeding absolute maximum  
ratings while in trickle start applications.  
Input Overvoltage Protection  
Low Start-Up Current  
Programmable Start Inhibit for Power Supply  
Sequencing and Protection  
Optocoupler Support  
Soft-Start ControUl  
■
■
The LT3781’s operating frequency is programmable and  
can be synchronized up to 350kHz. Switch phase is also  
controlled during synchronized operation to accommo-  
date multiple-converter systems. Internal logic guaran-  
tees 50% maximum duty cycle operation to prevent trans-  
former saturation.  
APPLICATIO S  
■
Isolated Telecommunication Systems  
■
Personal Computers and Peripherals  
■
Distributed Power Step-Down Converters  
The LT3781 is available in a 20-lead SSOP package.  
■
Lead Acid Battery Backup Systems  
Automotive and Heavy Equipment  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
U
TYPICAL APPLICATIO  
36V-72V to 5V/7A DC/DC  
Synchronous Forward Converter (Quarter-Brick Footprint)  
V
I
= 5V  
L2  
4.7µH  
L1  
OUT  
OUT  
V
T1  
6
= 7A  
4.7µH  
+
+
V
OUT  
IN  
Q1  
MURS120T3  
1
2
3
7
5
8
4
10Ω  
0.25W  
+
C5  
MBR-  
0540T1  
+
C2  
22µF  
100V  
C4  
1.5µF  
100V  
330µF  
1nF  
100V  
10Ω  
0.25W  
MURS120T3  
Q3  
10V  
10  
11  
12  
1nF  
100V  
Q6  
R9  
0.025Ω  
1/2W  
C3  
1.5µF  
100V  
9
4.7Ω  
Q5  
–
–
V
V
OUT  
IN  
ZVN3310F  
BAT54  
1OV  
10k  
2k  
0.22µF  
100Ω  
BIAS  
1OV  
0.1µF  
FZT690  
BIAS  
50V  
MMBD914LT1  
330pF  
100V  
CMPZ5242B  
12V  
73.2k  
1%  
270k  
0.25W  
4.7µF  
16V  
5V  
BAS21  
20  
OUT  
20k  
19  
18  
15 11  
14  
13  
LTC1693-2  
CC1  
3.3k  
V
CC  
V
TG BSTREF BG SENSE  
LT3781  
PGND  
6
8
3
1
4
BST  
12  
SG  
V
V
CC2  
2
1
0.047µF  
OVLO  
SHDN  
5
7
2
9
IN2  
IN1  
OUT2  
OUT1  
V
THERM SYNC SGND SS V  
C
5V  
FSET  
FB  
REF  
5
51Ω  
3.01k  
1%  
6
3
7
4
8
10  
100Ω  
1nF  
1.24k  
1%  
0.1µF  
52.3k  
GND2 GND1  
C2:SANYO 100MV22AX  
L2: PANASONIC ETQP6F4R1LF4  
6.8k  
+
C3, C4: VITRAMON VJ1825Y155MXB Q1,Q3:100V SILICONIX SUD40N10-25  
C5: 4X KEMET T510X337KO10AS  
L1: COILCRAFT DO1608C-472  
68µF  
20V  
10k  
4.7nF  
1k  
1%  
Q5,Q6: SILICONIX Si4450  
T1:COILTRONICS VP5-1200  
1µF  
150pF  
0.01µF  
3781f  
1
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