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LT3474IFE-1-TRPBF

更新时间： 2024-12-01 05:43:31
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
20页 215K
描述
Step-Down 1A LED Driver

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中文翻译

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LT3474IFE-1-TRPBF 数据手册

 浏览型号LT3474IFE-1-TRPBF的Datasheet PDF文件第2页浏览型号LT3474IFE-1-TRPBF的Datasheet PDF文件第3页浏览型号LT3474IFE-1-TRPBF的Datasheet PDF文件第4页浏览型号LT3474IFE-1-TRPBF的Datasheet PDF文件第5页浏览型号LT3474IFE-1-TRPBF的Datasheet PDF文件第6页浏览型号LT3474IFE-1-TRPBF的Datasheet PDF文件第7页 
LT3474/LT3474-1  
Step-Down  
1A LED Driver  
FEATURES  
DESCRIPTION  
The LT®3474/LT3474-1 are fixed frequency step-down  
DC/DCconvertersdesignedtooperateasconstant-current  
sources. An internal sense resistor monitors the output  
current allowing accurate current regulation, ideal for  
driving high current LEDs. High output current accuracy  
is maintained over a wide current range, from 35mA to  
1A, allowing a wide dimming range.  
n
True Color PWM™ Delivers Constant Color with  
400:1 Dimming Range  
n
Wide Input Range: 4V to 36V  
n
Up to 1A LED Current  
Adjustable 200kHz–2MHz Switching Frequency  
n
n
Adjustable Control of LED Current  
Integrated Boost Diode  
n
n
High Output Current Accuracy is Maintained  
Unique PWM circuitry allows a dimming range of 400:1,  
avoiding the color shift normally associated with LED  
current dimming.  
Over a Wide Range from 35mA to 1A  
n
Open LED (LT3474) and Short-Circuit Protection  
n
High Side Sense Allows Grounded  
Cathode Connection  
The high switching frequency offers several advantages,  
permitting the use of small inductors and ceramic capaci-  
tors. Small inductors combined with the 16-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.  
n
Uses Small Inductors and Ceramic Capacitors  
n
LT3474-1 Drives LED Strings Up to 26V  
n
Compact 16-Lead TSSOP Thermally Enhanced  
Surface Mount Package  
APPLICATIONS  
With their wide input range of 4V to 36V, the LT3474/  
LT3474-1 regulate a broad array of power sources, from  
5V logic rails to unregulated wall transformers, lead acid  
batteries and distributed power supplies. A current mode  
PWM architecture provides fast transient response and  
cycle-by-cycle current limiting. Frequency foldback and  
thermal shutdown provide additional protection.  
■
Automotive and Avionic Lighting  
■
Architectural Detail Lighting  
■
Display Backlighting  
Constant Current Sources  
■
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are  
the property of their respective owners. Patent Pending  
TYPICAL APPLICATION  
Step-Down 1A LED Driver  
Efficiency  
95  
V
IN  
V
= 12V  
IN  
5V TO 36V  
TWO SERIES CONNECTED  
WHITE 1A LEDS  
90  
85  
80  
0.22μF  
10μH  
V
BOOST  
SW  
LT3474  
IN  
2.2μF  
SHDN  
ONE WHITE 1A LED  
R
BIAS  
OUT  
T
75  
70  
REF  
V
DIMMING*  
CONTROL  
PWM  
ADJ  
80.6k  
0.1μF  
2.2μF  
65  
60  
55  
V
LED  
C
GND  
LED1  
*SEE APPLICATIONS SECTION FOR DETAILS  
200  
400  
LED CURRENT (mA)  
800  
0
1000  
600  
3474 TA01a  
3474 G02  
3474fd  
1
1234567...20

中文翻译

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