收藏本站
LT3743
APPLICATIONS INFORMATION
V CC_INT Capacitor Selection
The bypass capacitor for the V CC_INT pin should be larger
than 5μF for stability and has no ESR requirement. It is
recommended that the ESR be lower than 50mΩ to reduce
noise within the LT3743. For driving MOSFETs with gate
charges larger than 10nC, use 0.5μF/nC of total gate charge.
60
50
40
30
20
LED Current Dimming
The LT3743 provides the capability of traditional zero to full
current PWM dimming as well as PWM dimming between
two regulated LED current states. When the PWM signal
is low, no switching occurs and the output capacitors
are disconnected from ground. When PWM is high and
CTRL_SEL is low, the inductor current is regulated to the
low current state. In this state, the PWMGL signal is high,
connecting the output capacitor for the low regulated
current state. When PWM and CTRL_SEL are both high,
the inductor current is regulated to the high current state.
In this state, the PWMGH signal is high, connecting the
output capacitor for the high regulated current state. The
transition time between each of the regulated inductor
currents is determined by the inductor size, V IN and V O .
Due to the use of the switched output capacitors, the LED
current will begin to flow within 130ns of the transition on
the CTRL_SEL pin. Figure 8 shows the LED and inductor
current waveforms with the various states of the control
signals.
PWM
10
0
0 0.5 1.0 1.5 2.0
V CTRL (V)
3743 F06
Figure 6. LED Current vs CTRL Voltage
V REF
LT3743 R2
CTRL_L
R1
3743 F07
Figure 7. Analog Control of LED Current
t PWM
t ON(PWM)
To adjust the regulated LED current for the two control
states, an analog voltage is applied to the CTRL_L and
CTRL_H pins. Figure 6 shows the regulated voltage across
the sense resistor for control voltages up to 2V. Figure 7
shows the CTRL_L voltage created by a voltage divider
from V REF to ground. When sizing the resistor divider,
please be aware that the V REF pin is current limited to
500μA. Above 1.5V, the control voltage has no effect on
the regulated LED current.
For the widest dimming range, use the highest switching
frequency possible and lowest PWM frequency. For con-
figuration with the maximum PWM range, please contact
factory for optimized component selection.
CTRL_SEL
INDUCTOR
CURRENT
PWMGH
PWMGL
LED
CURRENT
ICTRL_H
Figure 8. LED Current vs CTRL Voltage
3743 F08
ICTRL_L
3743fd
16
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LT3745IUJ#TRPBF IC LED DVR 16CH 50MA 40QFN
LT3746IUHH#TRPBF IC LED DRIVER 32CHANNEL 56-QFN
LT3754IUH#TRPBF IC LED DVR 16CH 50MA 32QFN
LT3755EMSE#PBF IC LED DRVR HP CONS CURR 16-MSOP
LT3760EFE#PBF IC LED DVR WHT/CLR BCKLT 28TSSOP
LT3799IMSE#PBF IC LED DRIVER TRIAC DIM 16-MSOP
LT3956EUHE#PBF IC LED DVR BUCK BOOST 36-VQFN
LTC3201EMS#TRPBF IC LED DRVR WHITE BCKLGT 10-MSOP
相关代理商/技术参数
LT3743EFE#PBF 制造商:Linear Technology 功能描述:IC LED DRIVER BUCK TSSOP-28
LT3743EFE#TRPBF 功能描述:IC LED DVR SYNC STEPDOWN 28TSSOP 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
LT3743EFEPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Synchronous Step-Down LED Driver with Three-State Control
LT3743EFETRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Synchronous Step-Down LED Driver with Three-State Control
LT3743EUFD#PBF 功能描述:IC LED DRVR HP CONST CURR 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C
LT3743EUFD#PBF 制造商:Linear Technology 功能描述:IC LED DRIVER BUCK QFN-28 制造商:Linear Technology 功能描述:IC, LED DRIVER, BUCK, QFN-28
LT3743EUFD#TRPBF 功能描述:IC LED DVR SYNC STEP-DOWN 28QFN 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
LT3743EUFDPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Synchronous Step-Down LED Driver with Three-State Control