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| 型号： | LT3755EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16-MSOP |
| 标准包装： | 37 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | 回扫，低端，PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 白色 LED |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 4.5 V ~ 40 V |
| 输出电压： | 75V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT3755/LT3755-1/LT3755-2
APPLICATIONS INFORMATION
R SENSE,BUCK ≤
R SENSE ? V LED ( V IN – V LED )
L BUCK =
L BUCK-BOOST =
R SENSE ? V IN ( V LED – V IN )
L BOOST =
SchottkyRectifierSelection
The power Schottky diode conducts current during the
interval when the switch is turned off. Select a diode rated
for the maximum SW voltage. If using the PWM feature for
dimming, it is important to consider diode leakage, which
increases with the temperature, from the output during the
PWM low interval. Therefore, choose the Schottky diode
with sufficiently low leakage current. Table 4 has some
recommended component vendors.
Table 4. Schottky Rectifier Manufacturers
VENDOR WEB
On Semiconductor www.onsemi.com
Diodes, Inc. www.diodes.com
Central Semiconductor www.centralsemi.com
Sense Resistor Selection
The resistor, R SENSE , between the source of the exter-
nal NMOS FET and GND should be selected to provide
adequate switch current to drive the application without
exceeding the 108mV (typical) current limit threshold on
the SENSE pin of LT3755. For buck mode applications,
select a resistor that gives a switch current at least 30%
greater than the required LED current. For buck mode,
select a resistor according to:
0.07V
I LED
For buck-boost, select a resistor according to:
(DCM) switching. It is always prudent to verify the peak
inductor current in the application to ensure the sense
resistor selection provides margin to the SENSE current
limit threshold.
The placement of R SENSE should be close to the source of
the NMOS FET and GND of the LT3755. The SENSE input
to LT3755 should be a Kelvin connection to the positive
terminal of R SENSE .
Inductor Selection
The inductor used with the LT3755 should have a saturation
current rating appropriate to the maximum switch current
selected with the R SENSE resistor. Choose an inductor value
based on operating frequency, input and output voltage to
provide a current mode ramp on SENSE during the switch
on-time of approximately 20mV magnitude. The following
equations are useful to estimate the inductor value for
continuous conduction mode operation:
V IN ? 0.02V ? f OSC
R SENSE ? V LED ? V IN
( V LED + V IN ) ? 0.02V ? f OSC
V LED ? 0.02V ? f OSC
Table 5 provides some recommended inductor vendors.
R SENSE,BUCK-BOOST ≤
V IN ? 0.07V
( V IN + V LED ) I LED
Table 5. Inductor Manufacturers
VENDOR
Sumida
WEB
www.sumida.com
≤ IN
R SENSE,BOOST
Forboost,selectaresistoraccordingto:
V ? 0.07V
V LED ? I LED
Würth Elektronik
Coiltronics
Vishay
Coilcraft
www.we-online.com
www.cooperet.com
www.vishay.com
www.coilcraft.com
These equations provide an estimate of the sense resistor
value based on reasonable assumptions about induc-
tor current ripple during steady state switching. Lower
values of sense resistor may be required in applications
where inductor ripple current is higher. Examples include
applications with current limited operation at high duty
cycle, and those with discontinuous conduction mode
Loop Compensation
The LT3755 uses an internal transconductance error ampli-
fier whose VC output compensates the control loop. The
external inductor, output capacitor and the compensation
resistor and capacitor determine the loop stability.
37551fd
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3755EMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:40VIN, 75VOUT LED Controller |
| LT3755EUD#PBF | 功能描述:IC LED DRVR HP CONST CURR 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3755EUD#TRPBF | 功能描述:IC LED DRVR HP CONST CURR 16-QFN 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 |
| LT3755EUD-1#PBF | 功能描述:IC LED DRVR HP CONST CURR 16-QFN 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 |
| LT3755EUD-1#TRPBF | 功能描述:IC LED DRVR HP CONST CURR 16-QFN 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 |
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