- 您现在的位置：买卖IC网 > Datasheet目录338 > LTC3452EUF#TRPBF (Linear Technology)IC LED DRIVER PHOTO FLASH 20-QFN Datasheet资料下载
参数资料
| 型号： | LTC3452EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH 20-QFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 7 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 900kHz ~ 1.1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 4.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3452
APPLICATIO S I FOR ATIO
Unused Outputs
If fewer than 7 LED pins are to be used, unused LEDx pins
should be connected to V OUT . The LTC3452 senses which
current source outputs are not being used and shuts off
the corresponding output currents to save power. A small
trickle current (10 μ A: low power bank, 30 μ A: high power
bank) is still applied to unused outputs to detect if a white
LED is later switched in and also to distinguish unused
outputs from used outputs during start-up.
LED Failure Modes
If an individual LED fails as a short circuit, the current
source biasing it is shut off to save power. This is the same
initially designated unused at power-up by connecting its
LEDx pin to V OUT ). Efficiency is not materially affected.
If an individual LED fails as an open circuit, the control loop
will initially attempt to regulate off of its current source
feedback signal, since it will appear to be the one requiring
the largest forward voltage drop to run at its programmed
current. This will drive V OUT higher. As the open circuited
LED will never accept its programmed current, V OUT must
be voltage-limited by means of a secondary control loop.
The LTC3452 limits V OUT to 4.5V in this failure mode. The
other LEDs will still remain biased at the correct pro-
grammed current but the overall circuit efficiency will
decrease.
operation as described previously (if the output were
3452f
14
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3453EUF#TRPBF | IC LED DRIVER PHOTO FLASH 16-QFN |
| LTC3454EDD#TRPBF | IC LED DRIVER PHOTO FLASH 10-DFN |
| LTC3490EDD#PBF | IC LED DRIVER PHOTO FLASH 8-DFN |
| LTC3783EFE#PBF | IC LED DRVR PWM CONTROL 16-TSSOP |
| LV5026MC-AH | IC LED DRIVER 1CH HV 10SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3453 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LTC3453EUF | 制造商:Linear Technology 功能描述:LED DRVR 4Segment 3.3V/5V 16-Pin QFN EP |
| LTC3453EUF#PBF | 功能描述:IC LED DRIVER PHOTO FLASH 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 |
| LTC3453EUF#TRPBF | 功能描述:IC LED DRIVER PHOTO FLASH 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 |
| LTC3454 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Synchronous Buck-Boost High Current LED Driver |
发布紧急采购，3分钟左右您将得到回复。