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LT3965-1

更新时间： 2024-11-24 01:23:19
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
26页 337K
描述
8-Switch Matrix LED Dimmer

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中文翻译

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LT3965-1 数据手册

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LT3965/LT3965-1  
8-Switch Matrix LED Dimmer  
FEATURES  
DESCRIPTION  
n
Eight Independent 17V 330mΩ NMOS Switches  
TheLT®3965/LT3965-1isanLEDbypassswitchingdevice  
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)  
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  
2
The LT3965/LT3965-1 uses the I C 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 pins allow  
n
n
Open LED Overvoltage Protection  
Flicker Free PWM Dimming  
APPLICATIONS  
n
Automotive LED Headlight Clusters  
n
Large LED Displays  
n
Automated Camera Flash Equipment  
RGBW Color Mixing Lighting  
n
2
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog  
Devices, Inc. All other trademarks are the property of their respective owners.  
16 LT3965/LT3965-1 devices to share the I C bus. The  
device is available in a 28-lead TSSOP package  
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  
40V  
+
Q3  
LED  
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  
INTV  
0.1µF  
IN  
10k  
10k  
10k  
EN/UVLO  
PWM  
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  
–
IN4148  
Q1, Q3: ZETEX FMMT593  
28k  
LED  
D5  
Q2: ZETEX FMMT493  
3965 TA01  
39651fa  
1
For more information www.linear.com/LT3965  
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