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參數資料
| 型號： | LM3552 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅動器 |
| 英文描述： | 1A White LED Driver with Flash Timeout Protection |
| 中文描述： | 第1A白光LED閃光驅動器超時保護 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 756K |
| 代理商： | LM3552 |
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3552SD | 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 |
| LM3552SD/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 |
| LM3552SDEV | 功能描述:電源管理IC開發工具 LM3552SD EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3552SDX | 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 |
| LM3552SDX/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 |
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