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| 型号： | LT3743IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR SYNC STEP-DOWN 28QFN |
| 标准包装： | 2,500 |
| 拓扑： | 高端，低端，PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 频率： | 200kHz ~ 1MHz |
| 电源电压： | 6 V ~ 36 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x5） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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LT3743
High Current Synchronous
Step-Down LED Driver with
Three-State Control
FEATURES
DESCRIPTION
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PWM Dimming Provides Up to 3000:1 Dimming Ratio
CTRL_SEL Dimming Provides Up to 3000:1 Dimming
Ratio Between Any Current
Three-State Current Control for Color Mixing
±6% Current Regulation Accuracy
6V to 36V Input Voltage Range
Average Current Mode Control
2μs Maximum Recovery Time Between Any Current
Regulation State
<1μA Shutdown Current
Output Voltage Regulation and Open-LED Protection
Thermally Enhanced 4mm × 5mm QFN and
28-Pin FE Package
The LT ? 3743 is a fixed frequency synchronous step-down
DC/DC controller designed to drive high current LEDs. The
average current mode controller will maintain inductor
current regulation over a wide output voltage range of 0V
to (V IN – 2V). LED dimming is achieved through analog
dimming on the CTRL_L, CTRL_H and CTRL_T pins and
with PWM dimming on the PWM and CTRL_SEL pins.
Through the use of externally switched load capacitors,
the LT3743 is capable of changing regulated LED current
levels within several μs, providing accurate, high speed
PWM dimming between two current levels. The switching
frequency is programmable from 200kHz to 1MHz through
an external resistor on the RT pin.
DLP Projectors
High Power Architectural Lighting
Laser Diodes
APPLICATIONS
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TYPICAL APPLICATION
92% Efficient 20A LED Driver
Additional features include voltage regulation and
overvoltage protection set with a voltage divider from the
output to the FB pin. Overcurrent protection is provided
and set by the CTRL_H pin.
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. Protected by U.S. Patents including 7199560, 7321203,
8120335 and others pending.
EN/UVLO
PWM
CTRL_SEL
EN/UVLO
PWM
CTRL_SEL
V IN
1μF
4.7μF
× 4
V IN
10V TO 30V
V CC_INT
CTRL_H
2.2nF
R HOT
499?
82.5k
100k
100k
R NTC
10k
RT HG
SYNC
CBOOT
V REF LT3743 SW
CTRL_L
LG
GND
CTRL_T SENSE +
SENSE –
PWMGH
220nF
22μF
M1
1.1μH
M2
2.5m
OUTPUT
20A MAXIMUM
4.7μF
330μF
× 3
330μF
× 3
M3
M4
CTRL_SEL
5V/DIV
PWM
5V/DIV
SW
20V/DIV
I LED
10A/DIV
10nF
SS
V CL
PWMGL
FB
V CH
3743 TA01a
330μF
× 3
51.1k
10.0k
V IN = 24V 20μs/DIV
0A TO 2A TO 20A LED CURRENT STEP
3743 TA01b
34k
8.2nF
34k
8.2nF
M1, M2: SiR462DP
M3, M4: Si7234DP
3743fd
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3745 | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Channel 50mA LED |
| LT3745-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Channel 50mA LED |
| LT3745EUJ#PBF | 功能描述:IC LED DVR 16CH 50MA 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| LT3745EUJ#TRPBF | 功能描述:IC LED DVR 16CH 50MA 40QFN 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 |
| LT3745EUJ-1#PBF | 功能描述:IC LED DRVR 16CH 50MA 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
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