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LT3741-1_15 PDF预览

LT3741-1_15

更新时间： 2024-09-16 01:22:55
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 390K
描述
High Power, Constant Current, Constant Voltage, Step-Down Controller

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中文翻译

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LT3741-1_15 数据手册

 浏览型号LT3741-1_15的Datasheet PDF文件第2页浏览型号LT3741-1_15的Datasheet PDF文件第3页浏览型号LT3741-1_15的Datasheet PDF文件第4页浏览型号LT3741-1_15的Datasheet PDF文件第5页浏览型号LT3741-1_15的Datasheet PDF文件第6页浏览型号LT3741-1_15的Datasheet PDF文件第7页 
LT3741/LT3741-1  
High Power, Constant  
Current, Constant Voltage,  
Step-Down Controller  
FeaTures  
DescripTion  
The LT®3741 and LT3741-1 are fixed frequency synchro-  
nous step-down DC/DC controllers designed to accurately  
regulatetheoutputcurrentatupto20A.Theaveragecurrent-  
mode controller will maintain inductor current regulation  
n
Control Pin Provides Accurate Control of Regulated  
Output Current  
n
±1ꢀ.5 Voltage Regulation Accuracy  
n
±±5 Current Regulation Accuracy  
6V to 36V Input Voltage Range  
Wide Output Voltage Range Up to (V – 2V)  
Average Current Mode Control  
n
over a wide output voltage range of 0V to (V – 2V). The  
IN  
n
regulated current is set by an analog voltage on the CTRL  
pins and an external sense resistor. Due to its unique  
topology, the LT3741 is capable of sourcing and sinking  
current. If sinking current is not required, or for parallel  
applications, use the LT3741-1. The regulated voltage and  
overvoltage protection are set with a voltage divider from  
the output to the FB pin. Soft-Start is provided to allow a  
gradual increase in the regulated current during startup.  
The switching frequency is programmable from 200kHz to  
1MHzthroughanexternalresistorontheRTpinorthrough  
the use of the SYNC pin and an external clock signal.  
IN  
n
n
<1µA Shutdown Current  
Up to 94% Efficiency  
n
n
Additional Pin for Thermal Control of Load Current  
n
Thermally Enhanced 4mm × 4mm QFN and 20-Pin  
FE Package  
applicaTions  
n
General Purpose Industrial  
n
Super-Cap Charging  
Additional Features include an accurate external reference  
voltage for use with the CTRL pins, an accurate UVLO/EN  
pin that allows for programmable UVLO hysteresis, and  
thermal shutdown.  
n
Applications Needing Extreme Short-Circuit  
Protection and/or Accurate Output Current Limit  
n
Constant Current or Constant Voltage Source  
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.  
Protected by U.S. Patents including 7199560, 7321203 and others pending.  
Typical applicaTion  
10V/20A Constant Current, Constant Voltage Step-Down Converter  
VOUT vs IOUT  
V
IN  
V
EN/UVLO  
82.5k  
EN/UVLO  
RT  
SYNC  
IN  
14V TO 36V  
12  
10  
8
1µF  
100µF  
HG  
LT3741  
220nF  
V
REF  
CBOOT  
SW  
2.2µH  
V
10V  
20A  
2.5mΩ  
10nF  
OUT  
CTRL1  
VC  
6
V
CC_INT  
22µF  
39.2k  
5.6nF  
4
R
LG  
HOT  
150µF  
×2  
45.3k  
GND  
V
V
I
= 18V  
2
IN  
OUT  
+
–
CTRL2  
SS  
SENSE  
SENSE  
= 10V  
= 20A  
88.7k  
12.1k  
LIMIT  
0
R
NTC  
FB  
0
2
4
6
8
10 12 14 16 18 20 22  
(A)  
10nF  
I
OUT  
3741 TA01b  
3741 TA01a  
37411fe  
1
For more information www.linear.com/LT3741  
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