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LT3478_15

更新时间： 2024-01-14 03:11:58
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 293K
描述
4.5A Monolithic LED Drivers with True Color PWM Dimming

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中文翻译

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LT3478_15 数据手册

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LT3478/LT3478-1  
4.5A Monolithic LED  
Drivers with True Color  
PWM Dimming  
U
DESCRIPTIO  
FEATURES  
The LT®3478/LT3478-1 are 4.5A step-up DC/DC convert-  
ers designed to drive LEDs with a constant current over  
a wide programmable range. Series connection of the  
LEDs provides identical LED currents for uniform bright-  
ness without the need for ballast resistors and expensive  
factory calibration.  
■
True Color PWM™ Dimming Delivers Constant LED  
Color with Up to 3000:1 Range  
■
Wide Input Voltage Range: 2.8V to 36V  
■
4.5A, 60mΩ, 42V Internal Switch  
■
Drives LEDs in Boost, Buck-Boost or Buck Modes  
■
Integrated Resistors for Inductor and LED Current  
Sensing  
Program LED Current:  
TheLT3478-1reducesexternalcomponentcountandcost  
by integrating the LED current sense resistor. The LT3478  
uses an external sense resistor to extend the maximum  
programmableLEDcurrentbeyond1Aandalsotoachieve  
greater accuracy when programming low LED currents.  
Operating frequency can be set with an external resistor  
from 200kHz up to 2.25MHz. Unique circuitry allows a  
PWM dimming range up to 3000:1 while maintaining  
constant LED color. The LT3478/LT3478-1 are ideal for  
highpowerLEDdriverapplicationssuchasautomotiveTFT  
LCD backlights, courtesy lighting and heads-up displays.  
One of two CTRL pins can be used to program maximum  
LED current. The other CTRL pin can be used to program  
a reduction in maximum LED current vs temperature to  
maximize LED usage and improve reliability.  
■
100mA to 1050mA (LT3478-1)  
(10mV to 105mV)/R  
Program LED Current De-Rating vs Temperature  
Separate Inductor Supply Input  
Inrush Current Protection  
Programmable Soft-Start  
(LT3478)  
SENSE  
■
■
■
■
■
■
■
Fixed Frequency Operation from 200kHz to 2.25MHz  
Open LED Protection (Programmable OVP)  
Accurate Shutdown/UVLO Threshold with  
Programmable Hysteresis  
■
16-Pin Thermally Enhanced TSSOP Package  
U
APPLICATIO S  
■
High Power LED Driver  
Automotive Lighting  
Additional features include inrush current protection,  
programmable open LED protection and programmable  
soft-start. Each part is available in a 16-pin thermally  
enhanced TSSOP Package.  
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Patents Pending.  
U
TYPICAL APPLICATIO  
Automotive TFT LCD Backlight  
Efficiency vs V  
IN  
100  
95  
90  
85  
80  
10µH  
V
IN  
8V TO 16V  
I
f
= 700mA  
= 500kHz  
PWM DUTY CYCLE = 100%  
LED  
OSC  
10µF  
4.7µF  
V
IN  
V
S
L
SW  
SHDN  
OUT  
V
REF  
0.1Ω  
SENSE  
(LT3478)  
R
45.3k  
CTRL2  
LT3478-1  
LED  
OVPSET  
54.9k  
130k  
CTRL1  
PWM  
700mA  
15W  
SS  
V
R
T
C
6 LEDs LUXEON III (WHITE)  
12 14 16  
(V)  
6 LEDs  
(WHITE)  
8
10  
1µF  
0.1µF  
69.8k  
V
IN  
3478 TA01b  
PWM DIMMING  
CONTROL  
3478 TA01  
34781f  
1
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