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LT3965

更新时间： 2024-11-24 14:57:51
品牌 Logo 应用领域
亚德诺 - ADI 开关
页数 文件大小 规格书
26页 1836K
描述
8 开关矩阵 LED 调光器

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中文翻译

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LT3965 数据手册

 浏览型号LT3965的Datasheet PDF文件第2页浏览型号LT3965的Datasheet PDF文件第3页浏览型号LT3965的Datasheet PDF文件第4页浏览型号LT3965的Datasheet PDF文件第5页浏览型号LT3965的Datasheet PDF文件第6页浏览型号LT3965的Datasheet PDF文件第7页 
LT3965/LT3965-1  
8-Switch Matrix LED Dimmer  
FEATURES  
DESCRIPTION  
n
Eight Independent 17V 330mΩ NMOS Switches  
The LT®3965/LT3965-1 is an LED bypass switching  
device for dimming individual LEDs in a string using a  
common current source. It features eight individually  
controlled floating source 17V/330mΩ NMOS switches.  
The eight switches can be connected in parallel and/or  
in series to bypass current around one or more LEDs in  
a string. The LT3965 is initialized with all switches off  
(LEDs on), and the LT3965-1 is initialized with all switches  
on (LEDs off)The LT3965/LT3965-1 uses the I2C serial  
interface to communicate with the microcontroller. Each  
of the eight channels can be independently programmed  
to bypass the LED string in constant on or off, or PWM  
dimming with or without fade transition. Using the fade  
option provides 11-bit resolution logarithmic transition  
between PWM dimming states. The LT3965/LT3965-1  
provides an internal clock generator and also supports  
external clock source for PWM dimming. The LT3965/  
LT3965-1 reports fault conditions for each channel such  
as open LED and shorted LED. The four address select  
n
Independent On/Off/Dimming Control of 1 to 4 LEDs  
for Each Switch  
2
n
I C Multidrop Serial Interface with Programmable  
Open LED and Shorted LED Fault Reporting  
2
n
16 Unique I C Addresses  
n
V
Range: 2.7V to 5.5V and V Range: 8V to 60V  
DD  
IN  
n
n
n
Digital Programmable 256:1 PWM Dimming  
Fade Transition Between PWM Dimming States  
Optional Internal Clock Generator or External Clock  
Source for PWM Dimming  
n
n
n
Open LED Overvoltage Protection  
Flicker Free PWM Dimming  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Automotive LED Headlight Clusters  
n
Large LED Displays  
n
Automated Camera Flash Equipment  
RGBW Color Mixing Lighting  
2
pins allow 16 LT3965/LT3965-1 devices to share the I C  
bus. The device is available in a 28-lead TSSOP package.  
n
All registered trademarks and trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Matrix LED Dimmer Powered by a Buck Mode LED Driver  
BIAS UVLO DETECT  
BIAS  
750Ω  
Q2  
Q1  
1k  
49.9k  
M1  
1k  
D4  
+
LED  
1k  
BIAS  
IN  
0.5Ω  
V
+
IN  
Q3  
LED  
40V  
1µF  
EN/UVLO  
9.09k  
100V  
D2  
D3  
V
CC  
V
V
DD  
DRN8  
SRC8  
DRN7  
SRC7  
DRN6  
SRC6  
DRN5  
SRC5  
DRN4  
SRC4  
DRN3  
SRC3  
DRN2  
SRC2  
DRN1  
20k  
5V  
V
ISP  
ISN  
0.1µF  
IN  
10k  
10k  
10k  
EN/UVLO  
PWM  
INTV  
CC  
0.1µF  
100V  
SDA  
SCL  
SDA  
PWMOUT  
LT3965/  
LT3965-1  
SCL  
1µF  
2.2nF  
SYNC  
VMODE  
FB  
ALERT  
ALERT  
LT3955  
V
REF  
500mA  
EN/UVLO  
RTCLK  
EN/UVLO  
28k  
CTRL  
GND  
GNDK  
SW  
V
LED  
26V  
1µF  
50V  
500Hz DIMMING FREQUENCY  
PGND  
RT  
ADDR1  
ADDR2  
ADDR3  
ADDR4  
LEDREF  
DIM/SS VC  
28.7k  
375kHz  
L1: WURTH 744066330  
D1: DFLS260  
0.1µF  
0.01µF  
L1  
33µH  
D2, D3: CMSD6263S 2 IN 1 PACKAGE  
D4, D5: PMEG6010CEH  
D1  
M1: VISHAY Si7309DN  
SRC1  
GND  
–
LED  
IN4148  
Q1, Q3: ZETEX FMMT593  
28k  
D5  
Q2: ZETEX FMMT493  
3965 TA01  
Rev. B  
1
Document Feedback  
For more information www.analog.com  
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