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LT3952

更新时间： 2024-11-24 02:51:35
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
26页 2500K
描述
60V, 1.5A LED Driver with Internal Exponential Scale Dimming

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中文翻译

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LT3952 数据手册

 浏览型号LT3952的Datasheet PDF文件第2页浏览型号LT3952的Datasheet PDF文件第3页浏览型号LT3952的Datasheet PDF文件第4页浏览型号LT3952的Datasheet PDF文件第5页浏览型号LT3952的Datasheet PDF文件第6页浏览型号LT3952的Datasheet PDF文件第7页 
LT3950  
60V, 1.5A LED Driver with Internal  
Exponential Scale Dimming  
FEATURES  
DESCRIPTION  
The LT®3950 is a multitopology DC/DC converter designed  
specifically to drive high current LEDs. It contains a 1.5A,  
60V DMOS switch and supports an external PWM dim-  
ming PMOS. The LT3950 has an internal PWM generator  
for dimming that maps an analog control signal to an  
exponential scale used to define PWM dimming duty ratio.  
Using an exponential scale to define duty ratio preserves  
dimming resolution across a wide range of LED current.  
In addition to operating as a constant current source, the  
LT3950 also provides output voltage regulation. This can  
be used to prevent damage to the part in case of open LED  
events. A programmable switching frequency offers flex-  
ibility in design for higher efficiency or reduced compo-  
nent size. Enabling spread spectrum frequency modula-  
tion reduces EMI. The switching frequency can also easily  
be synchronized by driving the SYNC/SPRD pin with an  
external clock. LED current is programmed with a single  
external sense resistor and can be adjusted from zero to  
full-scale by an analog signal at the CTRL pin.  
n
Operates in Boost, SEPIC, Buck Mode and Buck-  
Boost Mode  
128:1 Internal Exponential Scale PWM Dimming  
Wide Input Voltage Range (3V to 60V)  
1.5A, 60V Internal Switch  
20000:1 External PWM Dimming at 100Hz  
2% LED Current and Output Voltage Regulation  
PMOS Switch Driver for PWM Dimming  
LED Short/Open Protection and Indication  
Constant Voltage and Constant Current Regulation  
Adjustable 300kHz to 2MHz Switching Frequency  
Adjustable 100Hz to 1kHz PWM Generator Frequency  
Internal Spread Spectrum Frequency Modulation  
Easy Synchronization to External Clock  
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Programmable V UVLO with Hysteresis  
Available in 16-Lead MSOP Package  
IN  
APPLICATIONS  
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Display Backlighting  
Automotive and Avionic Lighting  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. Patents, including 7199560, 7321203, 7746300, 8116045. Patents pending.  
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TYPICAL APPLICATION  
10W LED Driver for Automotive, 2MHz, 90% Efficient  
Efficiency and Power Loss with  
and without PWM Dimming  
V
10µH  
1Ω  
IN  
3V TO16V DC  
TRANSIENT  
TO 48V  
ꢀ00  
ꢀꢁ  
ꢀꢁ  
ꢀꢀ  
ꢀꢁ  
ꢀ0  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀ0  
ꢀ.000  
ꢀ.ꢁꢂ0  
ꢀ.ꢁ00  
ꢀ.ꢀꢁ0  
ꢀ.000  
ꢀ.ꢁꢂ0  
ꢀ.ꢁ00  
ꢀ.ꢁꢂ0  
ꢀ.000  
0.ꢀꢁ0  
0.ꢀ00  
2.2µF  
2.2µF  
V
SW  
ISP  
ISN  
ꢀꢁꢁꢂꢃꢂꢀꢄꢃꢅ ꢆ00ꢇ ꢈꢄ  
IN  
EN/UVLO  
1M  
100k  
ꢀꢁꢁꢂꢃꢂꢀꢄꢃꢅ ꢆꢀꢁꢁ.ꢇ ꢈꢉ  
ꢊ0ꢋ ꢌꢍꢎ ꢏꢂꢎꢎꢂꢄꢐ  
FAULT  
FAULT  
FB  
10W  
LED  
INTV  
CC  
24.9k  
LT3950  
POWER  
(DERATED  
BELOW  
ꢀ
ꢀ0ꢁ ꢂꢃꢄ ꢅꢆꢄꢄꢆꢇꢈ  
ꢀꢁꢂꢂꢃ ꢄꢅꢅ.  
1µF  
CTRL  
PWMTG  
VC  
V
= 7V)  
IN  
267k  
ꢀ
ꢀ00ꢁ ꢂꢃ  
ꢀꢁꢂꢂ  
PWM  
39k  
220pF  
SYNC/SPRD RP  
RT  
GND  
100k  
300Hz  
182k  
2MHz  
45.3k  
ꢀ0 ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢀ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀ0  
ꢀꢁꢂ  
ꢀ
ꢀꢁ  
3950 TA01a  
ꢀꢁꢂ0 ꢃꢄ0ꢅꢆ  
Rev. 0  
1
Document Feedback  
For more information www.analog.com  
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