LM3909

更新时间： 2024-11-04 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

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数据手册

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LM3909 数据手册

February 1995

LM3909 LED Flasher/Oscillator

General Description

Features

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

Powerful; as an oscillator directly drives an 8X speaker

Wide temperature range

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

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

Sales and advertising gimmicks

Emergency locators, for instance on fire extinguishers

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

Electronic applications such as trigger and sawtooth

generators

Siren for toy fire engine, (combined oscillator, speaker

driver)

broad capacitance tolerances, for example

20% to

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

1995 National Semiconductor Corporation

TL/H/7969

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7 8

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