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LT3743_10

更新时间： 2024-09-16 12:20:23
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
28页 403K
描述
High Current Synchronous Step-Down LED Driver with Three-State Control

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LT3743_10 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
±±% 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 and True  
Color PWM is a trademark 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 30V  
V
IN  
EN/UVLO  
PWM  
CTRL_SEL  
EN/UVLO  
PWM  
CTRL_SEL  
4.7μF  
s4  
1μF  
M1  
RT  
SYNC  
HG  
CTRL_SEL  
220nF  
82.5k  
100k  
5V/DIV  
OUTPUT  
CBOOT  
1.1μH  
2.5mΩ  
20A MAXIMUM  
PWM  
5V/DIV  
V
REF  
SW  
LT3743  
2.2nF  
4.7μF  
CTRL_L  
V
330μF  
s3  
CC_INT  
SW  
20V/DIV  
22μF  
R
LG  
M2  
HOT  
CTRL_H  
CTRL_T  
100k  
330μF  
s3  
499ꢀ  
GND  
+
M3  
SENSE  
SENSE  
I
LED  
10A/DIV  
–
R
NTC  
10k  
PWMGH  
M4  
SS  
PWMGL  
10nF  
3743 TA01b  
V
= 24V  
20μs/DIV  
51.1k  
10.0k  
IN  
0A TO 2A TO 20A LED CURRENT STEP  
FB  
330μF  
s3  
VCL  
34k  
VCH  
3743 TA01a  
34k  
8.2nF  
M1, M2: SiR462DP  
M3, M4: Si7234DP  
8.2nF  
3743fb  
1
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