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| 型号： | LT3590ESC8#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SC-70-8 |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压） |
| 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： | 650kHz ~ 1.05MHz |
| 电源电压： | 4.5 V ~ 55 V |
| 输出电压： | 55V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFSOP（0.492"，1.25mm 宽） |
| 供应商设备封装： | SC-70-8 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
| 其它名称： | LT3590ESC8#TRMPBFDKR |
LT3590
APPLICATIONS INFORMATION
V IN ? V LED
R 1 =
I LED =
,when V CTRL > 1.5V
=
,when V CTRL < 1.25V
I LED
Programming LED Current
The feedback resistor (R1 in Figure 1) and the sense volt-
age (V IN - V LED ) control the LED current.
I LED =
R 1
The CTRL pin controls the sense reference voltage as
shown in the Typical Performance Characteristics. For
CTRL higher than 1.5V, the sense reference is 200mV,
which results in full LED current. In order to have accu-
rate LED current, precision resistors are preferred (1%
is recommended). The formula and table for R1 selection
are shown below.
200mV
I LED
Table 3. R1 Theoretical Value for 200mV Sense
Using a DC Voltage
For some applications, the preferred method of brightness
control is a variable DC voltage to adjust the LED current.
The CTRL pin voltage can be modulated to set the dim-
ming of the LED string. As the voltage on the CTRL pin
increases from 0V to 1.5V, the LED current increases from
0 to I LED . As the CTRL pin voltage increases beyond 1.5V,
it has no effect on the LED current.
The LED current can be set by:
200mV
R1
V CTRL
6.25 ? R1
Feedback voltage variation versus control voltage is
shown in Figure 4.
I LED (mA)
10
20
30
40
50
R1 (Ω)
20
10
6.8
5.0
4.0
Using a Filtered PWM Signal
A variable duty cycle PWM can be used to control the
brightness of the LED string. The PWM signal is ?ltered
(Figure 5) by a RC network and fed to the CTRL pin.
The corner frequency of R1, C1 should be much lower
Dimming Control
There are three different types of dimming control circuits.
The LED current can be set by modulating the CTRL pin
than the frequency of the PWM signal. R1 needs to be
much smaller than the internal impedance in the CTRL
pin which is 100kΩ.
with a DC voltage, a ?ltered PWM signal or directly with
a PWM signal.
PWM
R1
10k
LT3590
CTRL
0.25
kHz TYP
C1
1 μ F
0.20
0.15
0.10
0.05
3590 F05
Figure 5. Dimming Control Using a Filtered PWM Signal
0
0
0.5
1.0
1.5
2.0
V CTRL (V)
3590 F04
Figure 4. Dimming and Shutdown Using CTRL Pin
3590f
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3590ESC8-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN |
| LT3591 | 制造商:LINER 制造商全称:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| LT3591EDDB#PBF | 制造商:Linear Technology 功能描述:LED DRVR 10Segment 3.3V/5V/9V 8-Pin DFN EP 制造商:Linear Technology 功能描述:LED DRIVER BOOST PWM/ANALOGU 制造商:Linear Technology 功能描述:LED DRIVER, BOOST, PWM/ANALOGUE, 1MHZ, DFN-8; Topology:Boost (Step Up); No. of Outputs:1; Output Voltage:42V; Driver Case Style:DFN; Input Voltage Min:2.5V; Input Voltage Max:12V; Dimming Control Type:PWM / Analogue ;RoHS Compliant: Yes |
| LT3591EDDB#TRMPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 8-DFN 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 |
| LT3591EDDB#TRPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 8-DFN 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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