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| 型号： | LT3478IFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16TSSOP |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 频率： | 200kHz ~ 2.25MHz |
| 电源电压： | 2.8 V ~ 36 V |
| 输出电压： | 42V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1339 (CN2011-ZH PDF) |
LT3478/LT3478-1
4.5A Monolithic LED
Drivers with True Color
PWM Dimming
FEATURES
DESCRIPTIO
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True Color PWM? Dimming Delivers Constant LED
Color with Up to 3000:1 Range
Wide Input Voltage Range: 2.8V to 36V
4.5A, 60m Ω , 42V Internal Switch
Drives LEDs in Boost, Buck-Boost or Buck Modes
Integrated Resistors for Inductor and LED Current
Sensing
Program LED Current:
100mA to 1050mA (LT3478-1)
(10mV to 105mV)/R SENSE (LT3478)
Program LED Current De-Rating vs Temperature
Separate Inductor Supply Input
Inrush Current Protection
Programmable Soft-Start
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
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.
The LT3478-1 reduces external component count and cost
by integrating the LED current sense resistor. The LT3478
uses an external sense resistor to extend the maximum
programmable LED current beyond 1A and also to achieve
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
high power LED driver applications such as automotive TFT
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
APPLICATIO S
a reduction in maximum LED current vs temperature to
maximize LED usage and improve reliability.
■
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High Power LED Driver
Automotive Lighting
Additional features include inrush current protection,
programmable open LED protection and programmable
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents Pending.
TYPICAL APPLICATIO
Automotive TFT LCD Backlight
soft-start. Each part is available in a 16-pin thermally
enhanced TSSOP Package.
Ef?ciency vs V IN
V IN 8V TO 16V
10 μ H
100
I LED = 700mA
4.7 μ F
V IN
SHDN
V S
L
SW
OUT
10 μ F
95
f OSC = 500kHz
PWM DUTY CYCLE = 100%
V REF
0.1 ?
45.3k
CTRL2
LT3478-1
LED
R SENSE
(LT3478)
90
OVPSET
54.9k
CTRL1
700mA
85
130k
PWM DIMMING
PWM
1 μ F
SS
V C
0.1 μ F
R T
69.8k
15W
6 LEDs
(WHITE)
80
8
10
6 LEDs LUXEON III (WHITE)
12 14 16
V IN (V)
3478 TA01b
CONTROL
3478 TA01
34781f
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3479 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LT3479EDE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.5V to 24V 14-Pin DFN EP |
| LT3479EDE#PBF | 功能描述:IC REG BOOST INV ADJ 3A 14DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3479EDE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER CURRENT MODE 制造商:Linear Technology 功能描述:DC-DC CONVERTER, CURRENT MODE, 3.5MHZ, D |
| LT3479EDE#TRPBF | 功能描述:IC REG BOOST INV ADJ 3A 14DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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