LM3909N National Semiconductor, LM3909N Datasheet

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LM3909N

Manufacturer Part Number
LM3909N
Description
IC LED FLASHER/OSCILLATOR 8-DIP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM3909N

Frequency
*
Voltage - Supply
*
Operating Temperature
*
Package / Case
*
Count
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM3909N
LM3909

Available stocks

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Price
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C 1995 National Semiconductor Corporation
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
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
a
Schematic Diagram
25 C to
100%
a
70 C It has been optimized for low power drain
TL H 7969
Typical 1 5V Flasher
b
20% to
Features
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Y
Y
Y
Operation over one year from one C size flashlight cell
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
Powerful as an oscillator directly drives an 8
Wide temperature range
Finding flashlights in the dark or locating boat mooring
floats
Sales and advertising gimmicks
Emergency locators for instance on fire extinguishers
Toys and novelties
Electronic applications such as trigger and sawtooth
generators
Siren for toy fire engine (combined oscillator speaker
driver)
Warning indicators powered by 1 4V to 200V
TL H 7969 – 1
Connection Diagram
See NS Package Number N08E
Order Number LM3909N
Dual-In-Line Package
Top View
RRD-B30M115 Printed in U S A
February 1995
TL H 7969 – 2
speaker

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LM3909N Summary of contents

Page 1

... Electronic applications such as trigger and sawtooth Y generators Siren for toy fire engine (combined oscillator speaker Y driver) 20 Warning indicators powered 200V Y Connection Diagram Order Number LM3909N See NS Package Number N08E TL H 7969 – 1 February 1995 speaker Dual-In-Line Package TL H 7969 – 2 Top View RRD-B30M115 Printed ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Power Dissipation V a Voltage Electrical Characteristics Parameter Supply Voltage (In Oscillation) Operating Current Flash Frequency 300 F 5% Capacitor High Flash Frequency ...

Page 3

Typical Applications (Continued)(See applications notes below) Warning Flasher High Voltage Powered Note Nominal flash rate 1 Hz APPLICATIONS NOTES Note 1 All capacitors shown are electrolytic unless marked otherwise Note 2 Flash rates and frequencies assume a 5% capacitor tolerance ...

Page 4

Typical Applications (Continued) (See applications notes on previous page) 3V Flasher Note Nominal flash rate 1 Hz Average DRAIN Fast Blinker Note Nominal flash rate Average DRAIN ...

Page 5

Typical Applications (Continued) (See applications notes above) Note LM3909 capacitor and LED are installed in a white translucent cap on the flashlight’s back end Only one contact strip (in addition to the case connection) is needed for flasher power Drawing ...

Page 6

Typical Applications (Continued) (See applications notes above) ‘‘Buzz Box’’ Continuity and Coil Checker Note Differences between shorts coils and a few ohms of resistance can be heard 1 kHz Square Wave Note Output voltage through a 10k load to ground ...

Page 7

Typical Applications (Continued) (See applications notes above) LED Booster Note High efficiency 4 mA drain Continuous appearing light obtained by supplying short high current pulses (2 kHz) to LEDs with higher than battery voltage available Incandescent Bulb Flasher TL H ...

Page 8

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Molded Dual-In-Line Package (N) Order Number LM3909N NS Package Number N08E 2 A critical component is any component of a life ...

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