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參數資料
| 型號： | LM3909N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | LM3909 LED Flasher/Oscillator |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 149K |
| 代理商： | LM3909N |
TL/H/7969
L
February 1995
LM3909 LED Flasher/Oscillator
General Description
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.
Packaged in an 8-lead plastic mini-DIP, the LM3909 will op-
erate over the extended consumer temperature range of
b
25
§
C to
a
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.
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.
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
broad capacitance tolerances, for example
b
20% to
a
100%.
Features
Y
Operation over one year from one C size flashlight cell
Y
Bright, high current LED pulse
Y
Minimum external parts
Y
Low cost
Y
Low voltage operation, from just over 1V to 5V
Y
Low current drain, averages under 0.5 mA during
battery life
Y
Powerful; as an oscillator directly drives an 8
X
speaker
Y
Wide temperature range
Applications
Y
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
Y
Electronic applications such as trigger and sawtooth
generators
Y
Siren for toy fire engine, (combined oscillator, speaker
driver)
Y
Warning indicators powered by 1.4V to 200V
Schematic Diagram
Typical 1.5V Flasher
TL/H/7969–1
Connection Diagram
Dual-In-Line Package
TL/H/7969–2
Top View
Order Number LM3909N
See NS Package Number N08E
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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