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LT3741

更新时间： 2024-11-05 05:43:35
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
24页 321K
描述
High Power, Constant Current, Constant Voltage, Step-Down Controller

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中文翻译

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LT3741 数据手册

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LT3741  
High Power, Constant  
Current, Constant Voltage,  
Step-Down Controller  
FeaTures  
DescripTion  
The LT®3741 is a fixed frequency synchronous step-down  
DC/DCcontrollerdesignedtoaccuratelyregulatetheoutput  
current at up to 20A. The average current-mode controller  
willmaintaininductorcurrentregulationoverawideoutput  
n
Control Pin Provides Accurate Control of Regulated  
Output Current  
n
1.5% Voltage Regulation Accuracy  
n
±±% Current Regulation Accuracy  
6V to 36V Input Voltage Range  
Wide Output Voltage Range Up to (V – 2V)  
Average Current Mode Control  
n
voltage range of 0V to (V – 2V). The regulated current is  
IN  
n
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. The regulated  
voltage and overvoltage protection are set with a voltage  
dividerfromtheoutputtotheFBpin.Soft-Startisprovided  
to allow a gradual increase in the regulated current during  
startup. The switching frequency is programmable from  
200kHz to 1MHz through an external resistor on the RT  
pin or through 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  
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.  
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.  
n
Super-Cap Charging  
n
Applications Needing Extreme Short-Circuit  
Protection and/or Accurate Output Current Limit  
n
Constant Current or Constant Voltage Source  
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  
s2  
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  
3741f  
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