参数资料
型号: LT3476EUHF#PBF
厂商: Linear Technology
文件页数: 1/14页
文件大小: 0K
描述: IC LED DRVR HP CONST CURR 38-QFN
标准包装: 52
恒定电流:
拓扑: PWM,降压(降压),升压(升压)
输出数: 4
内部驱动器:
类型 - 主要: 车载,背光
类型 - 次要: 颜色,RGB
频率: 200kHz ~ 2MHz
电源电压: 2.8 V ~ 16 V
输出电压: 2.2 V ~ 36 V
安装类型: 表面贴装
封装/外壳: 38-WFQFN 裸露焊盘
供应商设备封装: 38-QFN(5x7)
包装: 管件
工作温度: -40°C ~ 85°C
产品目录页面: 1339 (CN2011-ZH PDF)

LT3476
High Current
Quad Output LED Driver
True Color PWM TM Dimming Delivers Up to 5000:1
LED Current Regulation with High-Side Sense
VADJ Pin Accurately Sets LED Current Sense
Four Independent Driver Channels with 1.5A, 36V
Frequency Adjust Pin: 200kHz to 2MHz
High Efficiency Conversion = Up to 96%
Open LED Protection
Low Shutdown Current < 10μA
Wide V IN Range: 2.8V to 16V
Thermally Enhanced, 38-Lead, 5mm × 7mm
RGGB Lighting
Automotive and Avionic Lighting
TFT LCD Backlighting
Constant-Current Sources
FEATURES
n
Dimming Ratio (In Boost Configuration)
n
n
Threshold Over Range 10mV to 120mV
n
Internal NPN Switches
n
n
n
n
n
n
QFN Package
APPLICATIONS
n
n
n
n
TYPICAL APPLICATION
100W Quad 1A × 8 LED Driver
DESCRIPTION
The LT ? 3476 is a quad output DC/DC converter designed
to operate as a constant-current source for driving high
current LEDs. A fixed frequency, current mode architecture
results in stable operation over a wide range of supply and
output voltages. A frequency adjust pin allows the user to
program switching frequency between 200kHz and 2MHz
to optimize efficiency and external component size.
The LT3476 senses output current at the high side of
the LED. High side current sensing is the most flexible
scheme for driving LEDs, allowing buck, boost or buck-
boost configurations. Each current monitor threshold is
trimmed to within 2.5% at the full scale of 105mV. With
an external sense resistor, the user programs the output
current range of each channel. Each of the four regulators
is independently operated by that channel’s PWM signal.
This PWM feature allows precise adjustment of the color
mixing or dimming ratio of the LED source. Dimming
ratios up to 1000:1 can be achieved.
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and True
Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
1000:1 PWM Dimming at 100Hz
PV IN
33V
CAP1
CAP2
CAP3
CAP4
100m
LED1
100m
LED2
100m
LED3
100m
LED4
PWM
5V/DIV
UP TO
8 LEDS
1A
0.22μF
0.22μF
1A
1A
0.22μF
0.22μF
1A
2.2μF
× 4
I LED
500mA/DIV
5μs/DIV
3476 TA02
10μH
10μH
10μH
10μH
V IN
2.8V TO 16V
PWM1-4
SHDN
2.2μF
SW1
CAP1-4
LED1-4
V IN
PWM1-4
SHDN
SW2
LT3476
GND
SW3
SW4
REF
VADJ1-4
VC1-4
RT
3476 TA01
21k
1.05V
1nF
4.99k
100k
3476fb
1
相关PDF资料
PDF描述
LT3477EFE#PBF IC LED DRVR HP CONS CURR 20TSSOP
LT3478IFE#PBF IC LED DRVR HP CONS CURR 16TSSOP
LT3486EFE#PBF IC LED DRVR WHITE BCKLGT 16TSSOP
LT3491EDC#TRMPBF IC LED DRIVER WHITE BCKLGT 6-DFN
LT3492IFE#TRPBF IC LED DVR HP CONST CURR 28TSSOP
相关代理商/技术参数
参数描述
LT3476EUHF-TR 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Quad Output LED Driver
LT3476EUHF-TRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Quad Output LED Driver
LT3476IUHF#PBF 功能描述:IC LED DRVR HP CONST CURR 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极,PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3476IUHF#TRPBF 功能描述:IC LED DRVR HP CONST CURR 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极,PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3477 制造商:LINER 制造商全称:Linear Technology 功能描述:Full-Featured LED Driver with 1.5A Switch Current