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LT3519

更新时间： 2024-09-25 05:43:31
品牌 Logo 应用领域
凌特 - Linear 驱动器肖特基二极管
页数 文件大小 规格书
16页 240K
描述
LED Driver with Integrated Schottky Diode

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中文翻译

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LT3519 数据手册

 浏览型号LT3519的Datasheet PDF文件第2页浏览型号LT3519的Datasheet PDF文件第3页浏览型号LT3519的Datasheet PDF文件第4页浏览型号LT3519的Datasheet PDF文件第5页浏览型号LT3519的Datasheet PDF文件第6页浏览型号LT3519的Datasheet PDF文件第7页 
LT3519  
LED Driver with Integrated  
Schottky Diode  
FEATURES  
DESCRIPTION  
The LT®3519 are fixed frequency step-up DC/DC convert-  
ers designed to drive LEDs. They feature an internal 45V,  
750mA low side switch and Schottky diode. Combining a  
traditional voltage feedback and a unique floating current  
sense feedback allows these converters to operate as a  
constant-voltagesourceorconstant-currentsource.Inter-  
nal compensation simplifies applications. These devices  
feature floating LED current sense pins that provide the  
most flexibility in choosing a converter configuration to  
drive the LEDs. The LED current is externally program-  
mable with a 250mV sense resistor. The external PWM  
provides up to 3000:1 PWM dimming and the CTRL input  
provides analog dimming.  
n
™
Up to 3000:1 True Color PWM Dimming  
n
Wide Input Voltage Range  
Operation from 3V to 30V  
Transient Protection to 40V  
n
n
n
n
n
Floating LED Current Sense from 0V to 45V  
45V, 750mA Internal Switch  
Internal Schottky Diode  
Constant-Current and Constant-Voltage Regulation  
Boost, SEPIC, Buck-Boost Mode or Buck Mode  
Topology  
n
n
n
n
n
n
n
Open LED Protection and Open LED Status Pin  
Programmable Undervoltage Lockout with Hysteresis  
Fixed Frequency: 400kHz (LT3519)  
Internal Compensation  
CTRL Pin Provides Analog Dimming  
Low Shutdown Current: <1μA  
16-Lead MSOP Package  
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.  
APPLICATIONS  
n
Automotive  
n
Industrial  
n
Constant Current Source  
Current Limited Constant Voltage Source  
n
TYPICAL APPLICATION  
4W Boost Automotive LED Driver  
LED Current vs VIN  
68μH  
V
OUT  
V
120  
100  
IN  
V
= 6V AND ABOVE  
IN  
6V TO 30V  
1μF  
4.7μF  
SW ANODE CATHODE  
V
ISP  
IN  
80  
60  
1M  
2.5Ω  
100k  
ISN  
FB  
SHDN/UVLO  
LT3519  
1M  
243k  
1M  
V
REF  
40  
20  
0
38V LED  
100mA  
CTRL  
29.4k  
137k  
OPENLED  
GND  
PWM  
0
10  
20  
30  
V
(V)  
IN  
M1  
3519 TA01b  
PWM  
3519 TA01a  
3519f  
1
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