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參數資料
型號: LM3551SD
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 顯示驅動器
英文描述: 1A White LED Driver with Flash Timeout Protection
中文描述: LED DISPLAY DRIVER, QCC14
封裝: 4 X 4 MM, LLP-24
文件頁數: 1/15頁
文件大小: 756K
代理商: LM3551SD
LM3551/LM3552
1A White LED Driver with Flash Timeout Protection
General Description
The LM3551 and LM3552 are fixed frequency, current mode
step-up DC/DC converters with two integrated NFETs that
can be used for precision LED brightness control. The de-
vices are capable of driving loads up to 1A from a single-cell
Li-Ion battery.
The LM3551 and LM3552 can drive one or more high current
flash LEDs either in a high power Flash mode or a lower
power Torch mode using the TORCH/FLASH pin.Aprogram-
mable Timeout function on the FTO pin forces the internal
NFETs to turn off after a certain user defined time. An
external SD pin (LM3551) or EN pin (LM3552) is available to
put the device into low power shutdown mode. During shut-
down, the feedback resistors and the load are disconnected
from the input to avoid leakage current paths to ground.
User programmable soft-start circuitry has been integrated
to eliminate large inrush currents at start-up. Over-voltage
protection circuitry and a 1.25MHz switching frequency allow
for the use of small, low-cost output capacitors with lower
voltage ratings.
The LM3551 and LM3552 are available in a low profile 14 pin
LLP package.
Features
n
Up to 1A total drive current
n
Flash timeout protection
n
Independent Torch/Flash/Shutdown modes
n
LED disconnect in shutdown
n
Programmable soft-start limits inrush current
n
Over-voltage protection
n
Wide voltage range 2.7 to 5.5V
n
1.25MHz constant switching frequency
n
Small, low profile package, non-pullback LLP14 (4mm x
4mm)
Applications
n
White LED Camera Flash
n
White LED Torch (Flashlight)
n
DSC (Digital Still Camera) Flash
n
Cellular Camera Phone Flash
n
PDA Camera Flash
n
Camcorder Torch (Flashlight) lamp
Typical Application Circuits
20151205
August 2005
L
2005 National Semiconductor Corporation
DS201512
www.national.com
相關PDF資料
PDF描述
LM3551SDX 1A White LED Driver with Flash Timeout Protection
LM3552SD 1A White LED Driver with Flash Timeout Protection
LM3552SDX 1A White LED Driver with Flash Timeout Protection
LM3552 1A White LED Driver with Flash Timeout Protection
LM3551 1A White LED Driver with Flash Timeout Protection
相關代理商/技術參數
參數描述
LM3551SD 制造商:Texas Instruments 功能描述:LED DRIVER BOOST POWERWISE LLP-14
LM3551SD/NOPB 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
LM3551SDX 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
LM3551SDX/NOPB 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
LM3552 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1A White LED Driver with Flash Timeout Protection
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