- 您现在的位置：买卖IC网 > PDF目录14462 > LT3587EUD#PBF (Linear Technology)IC REG BOOST INV ADJ DL 20QFN PDF资料下载
参数资料
| 型号： | LT3587EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ DL 20QFN |
| 标准包装： | 121 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 ±32V |
| 输入电压： | 2.5 V ~ 6 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN 裸露焊盘（3x3） |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3587
APPLICATIONS INFORMATION
Besides acting as a fault output indicator, the Fault pin
is also an input pin. If this pin is externally forced low
below 400mV, the LT3587 behaves as if a fault event has
been detected and all the channels turn off. In order to
turn the part back on, remove the external voltage that
forces the pin low and reset the part. Figure 11 shows the
waveforms when the Fault pin is externally forced low and
the subsequent resetting of the part.
Since the programmed V OUT3 current is proportional to
the current through R IFB3 , the LED current can be adjusted
according to the following formula:
I VOUT3 = (0.8V – V DAC-OUT ) ? 200/R IFB3
A higher DAC output voltage level results in lower LED
current and hence lower overall brightness. Conversely,
a lower DAC output voltage results in higher LED current
and higher brightness. Note that the DAC output impedance
V FLT
5V/DIV
ENSS1/ENSS3
5V/DIV
V VOUT1
10V/DIV
V NEG
10V/DIV
V VOUT3
20V/DIV
FLTFORCED LOW
PART RESET
should be low enough to be able to sink approximately
1/200 of the desired maximum LED current without any
appreciable error for accurate dimming control.
Note also that the maximum output current is limited by
the output disconnect current limit to 110mA (typ).
PWM Dimming
100ms/DIV
3587 F11
Changing the forward current ?owing in the LEDs not
only changes the brightness intensity of the LEDs, it also
Figure 11. Waveforms When the
Fault Pin is Externally Forced Low
Dimming Control For Boost3 Current Regulator as an
LED Driver
As shown on the front page application and the Block Dia-
gram, one of the most common applications for the Boost3
channel when con?gured as a boost current regulator is
a backlight LED driver. In an LED driver application, there
are two different ways to implement a dimming control of
changes the color. The chromaticity of the LEDs changes
with the change in forward current. Many applications
cannot tolerate any shift in the color of the LEDs. Control-
ling the intensity of the LEDs with a direct PWM signal
allows dimming of the LEDs without changing the color.
In addition, direct PWM dimming offers a wider dimming
range to the user.
V VIN
2.5V TO 5V
10 μ H
the LED string. The LED current can be adjusted either by
using a digital to analog converter (DAC) with a resistor
R IFB3 or by using a PWM signal.
V IN
LT3587
SW3
CAP3
V OUT3
1 μ F
LED DRIVER
Using a DAC and a Resistor
I FB3
EN/SS3
For some applications, the preferred method of brightness
control is using a DAC and a resistor. The Boost3 con?gura-
DAC
LTC2630
V DAC-OUT
R IFB3
8.06k
tion for using this method is shown in Figure 12.
3587 F12
Figure 12. Dimming Using a DAC and a Resistor
3587fc
16
相关PDF资料 |
PDF描述 |
|---|---|
| VE-BWB-EW-F4 | CONVERTER MOD DC/DC 95V 100W |
| 1130-392K-RC | CHOKE RF HI CURR 3900UH 10% RAD |
| 1130-391K-RC | CHOKE RF HI CURR 390UH 10% RAD |
| RCB34DHLR | CONN EDGECARD 68POS DIP .050 SLD |
| RCB34DHFT | CONN EDGECARD 68POS .050 SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3587EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Monolithic Inverter and Dual Boost |
| LT3590 | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V Triple Step-Down LED Driver Programmable Temperature Protection |
| LT3590EDC#PBF | 制造商:Linear Technology 功能描述:IC LED DRIVER BULK MODE 48V 制造商:Linear Technology 功能描述:IC, LED DRIVER, BULK MODE, 48V |
| LT3590EDC#TRMPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 6-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 |
| LT3590EDC#TRPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 6-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 |
发布紧急采购，3分钟左右您将得到回复。