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LM3909 PDF预览

LM3909

更新时间: 2024-11-17 22:51:51
品牌 Logo 应用领域
美国国家半导体 - NSC 振荡器
页数 文件大小 规格书
8页 151K
描述
LM3909 LED Flasher/Oscillator

LM3909 数据手册

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February 1995  
LM3909 LED Flasher/Oscillator  
General Description  
Features  
Y
Y
Y
Y
Y
Y
Operation over one year from one C size flashlight cell  
The LM3909 is a monolithic oscillator specifically designed  
to flash Light Emitting Diodes. By using the timing capacitor  
for voltage boost, it delivers pulses of 2 or more volts to the  
LED while operating on a supply of 1.5V or less. The circuit  
is inherently self-starting, and requires addition of only a bat-  
tery and capacitor to function as an LED flasher.  
Bright, high current LED pulse  
Minimum external parts  
Low cost  
Low voltage operation, from just over 1V to 5V  
Low current drain, averages under 0.5 mA during  
battery life  
Packaged in an 8-lead plastic mini-DIP, the LM3909 will op-  
erate over the extended consumer temperature range of  
Y
Y
Powerful; as an oscillator directly drives an 8X speaker  
Wide temperature range  
b
a
25 C to 70 C. It has been optimized for low power drain  
§
§
and operation from weak batteries so that continuous oper-  
ation life exceeds that expected from battery rating.  
Applications  
Y
Application is made simple by inclusion of internal timing  
resistors and an internal LED current limit resistor. As  
shown in the first two application circuits, the timing resis-  
tors supplied are optimized for nominal flashing rates and  
minimum power drain at 1.5V and 3V.  
Finding flashlights in the dark, or locating boat mooring  
floats  
Y
Sales and advertising gimmicks  
Y
Emergency locators, for instance on fire extinguishers  
Y
Toys and novelties  
Timing capacitors will generally be of the electrolytic type,  
and a small 3V rated part will be suitable for any LED flasher  
using a supply up to 6V. However, when picking flash rates,  
it should be remembered that some electrolytics have very  
Y
Electronic applications such as trigger and sawtooth  
generators  
Y
Siren for toy fire engine, (combined oscillator, speaker  
driver)  
b
broad capacitance tolerances, for example  
a
20% to  
Y
100%.  
Warning indicators powered by 1.4V to 200V  
Schematic Diagram  
Connection Diagram  
Typical 1.5V Flasher  
Dual-In-Line Package  
TL/H/7969–2  
Top View  
Order Number LM3909N  
See NS Package Number N08E  
TL/H/7969–1  
C
1995 National Semiconductor Corporation  
TL/H/7969  
RRD-B30M115/Printed in U. S. A.  

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