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LT3475

更新时间： 2024-12-02 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 驱动驱动器
页数 文件大小 规格书
20页 243K
描述
双通道降压型 1.5A LED 驱动器

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中文翻译

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LT3475 数据手册

 浏览型号LT3475的Datasheet PDF文件第2页浏览型号LT3475的Datasheet PDF文件第3页浏览型号LT3475的Datasheet PDF文件第4页浏览型号LT3475的Datasheet PDF文件第5页浏览型号LT3475的Datasheet PDF文件第6页浏览型号LT3475的Datasheet PDF文件第7页 
LT3475/LT3475-1  
Dual Step-Down  
1.5A LED Driver  
U
DESCRIPTIO  
FEATURES  
True Color PWMTM Delivers Constant Color with  
The LT®3475/LT3475-1 are dual step-down DC/DC  
converters designed to operate as a constant-current  
source. An internal sense resistor monitors the output  
current allowing accurate current regulation ideal for  
driving high current LEDs. The high side current sense al-  
lowsgroundedcathodeLEDoperation.Highoutputcurrent  
accuracy is maintained over a wide current range, from  
50mA to 1.5A, allowing a wide dimming range. Unique  
PWM circuitry allows a dimming range of 3000:1, avoid-  
ing the color shift normally associated with LED current  
dimming.  
■
3000:1 Dimming Range  
■
Wide Input Range: 4V to 36V Operating, 40V  
Maximum  
■
Accurate and Adjustable Control of LED Current  
from 50mA to 1.5A  
■
High Side Current Sense Allows Grounded Cathode  
LED Operation  
■
Open LED (LT3475) and Short Circuit Protection  
■
LT3475-1 Drives LED Strings Up to 25V  
■
Accurate and Adjustable 200kHz to 2MHz  
Switching Frequency  
The high switching frequency offers several advantages,  
permitting the use of small inductors and ceramic capaci-  
tors. Small inductors combined with the 20 lead TSSOP  
surface mount package save space and cost versus  
alternative solutions. The constant switching frequency  
combined with low-impedance ceramic capacitors result  
in low, predictable output ripple.  
■
Anti-Phase Switching Reduces Ripple  
■
Uses Small Inductors and Ceramic Capacitors  
■
Available in the Compact 20-Lead TSSOP Thermally  
Enhanced Surface Mount Package  
U
APPLICATIO S  
■
Automotive and Avionic Lighting  
Withitswideinputrangeof4Vto36V,theLT3475/LT3475-1  
regulate a broad array of power sources. A current mode  
PWM architecture provides fast transient response and  
cycle-by-cycle current limiting. Frequency foldback and  
thermal shutdown provide additional protection.  
■
Architectural Detail Lighting  
■
Display Backlighting  
Constant-Current Sources  
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Patents Pending.  
U
TYPICAL APPLICATIO  
Dual Step-Down 1.5A LED Driver  
Efficiency  
V
IN  
5V TO 36V  
4.7μF  
95  
V
SHDN  
BOOST2  
IN  
V
= 12V  
TWO SERIES CONNECTED  
WHITE 1.5A LEDS  
IN  
BOOST1  
90  
85  
80  
0.22μF  
0.22μF  
LT3475  
10μH  
10μH  
SW1  
SW2  
SINGLE WHITE 1.5A LED  
OUT1  
LED1  
OUT2  
LED2  
75  
70  
*DIMMING  
CONTROL  
DIMMING*  
CONTROL  
PWM1  
PWM2  
V
C1  
V
C2  
65  
60  
55  
REF  
R
T
2.2μF  
0.1μF  
2.2μF  
0.1μF  
1.5A LED  
CURRENT  
1.5A LED  
CURRENT  
V
ADJ1  
V
ADJ2  
24.3k  
GND  
0.5  
1
0
1.5  
LED CURRENT (A)  
3475 TA01  
*SEE APPLICATIONS SECTION FOR DETAILS  
f
= 600kHz  
SW  
3475 TA01b  
3475fb  
1
1234567...20

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