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3598 PDF预览

3598

更新时间: 2024-11-24 06:21:55
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
20页 342K
描述
6-String 30mA LED Driver with 1.5% Current Matching

3598 数据手册

 浏览型号3598的Datasheet PDF文件第2页浏览型号3598的Datasheet PDF文件第3页浏览型号3598的Datasheet PDF文件第4页浏览型号3598的Datasheet PDF文件第5页浏览型号3598的Datasheet PDF文件第6页浏览型号3598的Datasheet PDF文件第7页 
LT3598  
6-String 30mA LED Driver  
with 1.5% Current Matching  
FEATURES  
DESCRIPTION  
TheLT®3598isaxedfrequencystep-upDC/DCconverter  
designed to drive up to six strings of LEDs at an output  
voltage up to 44V. LED dimming can be achieved with  
analog dimming on the CTRL pin, and with pulse width  
modulation dimming on the PWM pin. The LT3598 accu-  
rately regulates LED current even when the input voltage  
is higher than the LED output voltage. The switching fre-  
quency is programmable from 200kHz to 2.5MHz through  
an external resistor.  
n
True Color PWMDimming Delivers Up to 3000:1  
Dimming Ratio  
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Drives Six Strings of LEDs at Up to 30mA  
n
1.5% Accurate LED Current Matching  
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Wide Input Voltage Range: 3.2V to 30V  
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Output Voltage Up to 44V  
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Regulates Current Even When V > V  
IN  
OUT  
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Disconnects LEDs in Shutdown  
Programmable Open LED Protection (Regulated)  
OPENLED Alert Pin  
Additional features include programmable overvoltage  
protection, switching frequency synchronization to an  
external clock, LED current derating based on junction  
temperature and/or LED temperature, LED string disable  
control, OPENLED alert pin and output voltage limiting  
when all LED strings are disconnected. The LT3598 is  
available in a thermally enhanced 24-pin (4mm × 4mm)  
QFN package.  
Programmable LED Current Derating  
Adjustable Frequency: 200kHz to 2.5MHz  
Synchronizable to an External Clock  
Parallel Channels for Higher Current per LED String  
Thermally Enhanced 4mm × 4mm QFN Package  
APPLICATIONS  
n
Notebook Computer Display  
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. Protected by U.S. Patents, including 7199560, 7321203.  
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Medium Size Displays  
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Automotive LCD Display  
TYPICAL APPLICATION  
LED Current Matching  
90% Efficient LED Driver for 60 White LEDs  
PV  
IN  
8V TO 40V  
10μH  
1.5  
ALL SIX LED STRINGS  
4.7μF  
2.2μF  
SW  
V
OUT  
V
1.0  
IN  
V
V
O_SW  
IN  
5V  
1.00M  
30.9k  
100k  
2.2μF  
0.5  
OPENLED  
SHDN  
PWM  
FB  
SHDN  
0
PWM  
SYNC  
LT3598  
–0.5  
–1.0  
–1.5  
SYNC  
RT  
51.1k  
V
REF  
10k  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
–25  
0
25  
50  
75 100 125  
–50  
CTRL  
TEMPERATURE (°C)  
20mA  
3598 TA01b  
100k  
T
I
V
C
SS  
GND  
SET SET  
60.4k  
10nF  
2.61k  
15nF  
47pF  
14.7k  
100k  
3598 TA01a  
3598f  
1

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