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LT3478EFE-1#TR PDF预览

LT3478EFE-1#TR

更新时间： 2023-06-15 00:00:00
品牌 Logo 应用领域
凌特 - Linear 驱动光电二极管接口集成电路
页数 文件大小 规格书
24页 288K
描述
LED Driver, 6-Segment, PDSO16

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中文翻译

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LT3478EFE-1#TR 技术参数

是否Rohs认证：不符合生命周期：Obsolete
包装说明：4.40 MM, PLASTIC, TSSOP-16Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.05Is Samacsys：N
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：R-PDSO-G16
JESD-609代码：e0长度：5 mm
湿度敏感等级：1复用显示功能：NO
功能数量：1区段数：6
端子数量：16最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：HTSSOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：1.1 mm
最大供电电压：36 V最小供电电压：2.8 V
标称供电电压：2.7 V表面贴装：YES
温度等级：AUTOMOTIVE端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL处于峰值回流温度下的最长时间：20
宽度：4.4 mmBase Number Matches：1

LT3478EFE-1#TR 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
1234567...24

中文翻译

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