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LT3743IFEPBF

更新时间： 2024-11-06 05:43:35
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
28页 348K
描述
High Current Synchronous Step-Down LED Driver with Three-State Control

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中文翻译

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LT3743IFEPBF 数据手册

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LT3743  
High Current Synchronous  
Step-Down LED Driver with  
Three-State Control  
FEATURES  
DESCRIPTION  
The LT®3743 is a fixed frequency synchronous step-down  
DC/DCcontrollerdesignedtodrivehighcurrentLEDs. The  
average current mode controller will maintain inductor  
current regulation over a wide output voltage range of 0V  
n
PWM Dimming Provides Up to 3000:1 Dimming Ratio  
n
CTRL_SEL Dimming Provides Up to 3000:1 Dimming  
Ratio Between Any Current  
n
Three-State Current Control for Color Mixing  
n
6% Current Regulation Accuracy  
to (V – 2V). LED dimming is achieved through analog  
IN  
n
6V to 36V Input Voltage Range  
dimming on the CTRL_L, CTRL_H and CTRL_T pins and  
with PWM dimming on the PWM and CTRL_SEL pins.  
Through the use of externally switched load capacitors,  
the LT3743 is capable of changing regulated LED current  
levels within several μs, providing accurate, high speed  
PWM dimming between two current levels. The switching  
frequencyisprogrammablefrom200kHzto1MHzthrough  
an external resistor on the RT pin.  
n
Average Current Mode Control  
n
2μs Maximum Recovery Time Between Any Current  
Regulation State  
<1μA Shutdown Current  
n
n
Output Voltage Regulation and Open-LED Protection  
Thermally Enhanced 4mm × 5mm QFN and  
n
28-Pin FE Package  
Additional features include voltage regulation and  
overvoltage protection set with a voltage divider from the  
output to the FB pin. Overcurrent protection is provided  
and set by the CTRL_H pin.  
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.  
APPLICATIONS  
n
DLP Projectors  
High Power Architectural Lighting  
n
n
Laser Diodes  
TYPICAL APPLICATION  
92% Efficient 20A LED Driver  
V
IN  
10V TO 36V  
V
IN  
EN/UVLO  
PWM  
CTRL_SEL  
EN/UVLO  
PWM  
CTRL_SEL  
4.7μF  
s4  
1μF  
RT  
SYNC  
HG  
CTRL_SEL  
220nF  
82.5k  
40k  
5V/DIV  
V
OUT  
20A MAXIMUM  
CBOOT  
1.1μH  
2.5mΩ  
PWM  
5V/DIV  
V
REF  
SW  
LT3743  
2nF  
HOT  
20μF  
CTRL_L  
V
CC_INT  
SW  
20V/DIV  
1mF  
20μF  
R
LG  
CTRL_H  
CTRL_T  
40k  
1mF  
45.3k  
GND  
+
SENSE  
SENSE  
I
LED  
10A/DIV  
–
R
NTC  
680k  
PWMGH  
SS  
PWMGL  
10nF  
3743 TA01b  
V
= 24V  
20μs/DIV  
51k  
IN  
0A TO 2A TO 20A LED CURRENT STEP  
FB  
VCL  
VCH  
1mF  
10.0k  
3743 TA01a  
34k  
9nF  
34k  
9nF  
3743f  
1
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