LM3909 [NSC]

LM3909 LED Flasher/Oscillator; LM3909 LED闪光器/振荡器
LM3909
型号: LM3909
厂家: National Semiconductor    National Semiconductor
描述:

LM3909 LED Flasher/Oscillator
LM3909 LED闪光器/振荡器

振荡器
文件: 总8页 (文件大小:151K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
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.  
Absolute Maximum Ratings  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales  
Office/Distributors for availability and specifications.  
b
a
25 C to 70 C  
Operating Temperature Range  
§
§
Lead Temperature (Soldering, 10 sec.)  
260 C  
§
Power Dissipation  
Va Voltage  
500 mW  
6.4V  
Electrical Characteristics  
Conditions  
Parameter  
Min  
Typ  
Max  
Units  
(Applications Note 3)  
Supply Voltage  
(In Oscillation)  
1.15  
6.0  
0.75  
1.3  
V
mA  
Hz  
kHz  
V
Operating Current  
Flash Frequency  
0.55  
1.0  
300 mF, 5% Capacitor  
0.65  
1.35  
High Flash Frequency  
Compatible LED Forward Drop  
Peak LED Current  
Pulse Width  
0.30 mF, 5% Capacitor  
1 mA Forward Current  
350 mF Capacitor  
1.1  
2.1  
45  
mA  
ms  
350 mF Capacitors at (/2 Amplitude  
6.0  
Typical Applications (See applications notes on following page)  
Triac Trigger  
es at about 8 kHz.  
nsformer isolated if  
TL/H/7969–3  
2
Typical Applications (Continued)(See applications notes below)  
Warning Flasher High Voltage Powered  
Typical Operating Conditions  
Nominal  
Flash Hz  
Va  
C
T
R
S
R
FB  
Va  
RANGE  
6V  
2
2
400 mF  
1k  
1.5k  
1k  
5V25V  
15V  
180 mF 3.9k  
13V50V  
43k  
180 mF  
100V  
1.7  
1k  
85V200V  
1W  
TL/H/7969–4  
1.5V Flasher  
TL/H/7969–6  
Estimated Battery Life  
(Continuous 1.5V Flasher Operation)  
TL/H/7969–5  
Type  
Size Cell  
Note: Nominal flash rate: 1 Hz.  
Standard  
Alkaline  
AA  
C
3 months  
7 months  
1.3 years  
6 months  
15 months  
2.6 years  
D
Note: Estimates are made from our tests and manufacturers  
data. Conditions are fresh batteries and room temperature. Clad  
or ‘‘leak-proof’’ batteries are recommended for any application  
of five months or more. Nickel Cadmium cells are not recom-  
mended.  
APPLICATIONS NOTES  
Note 1: All capacitors shown are electrolytic unless marked otherwise.  
b
a
Note 2: Flash rates and frequencies assume a 5% capacitor tolerance. Electrolytics may vary 20% to 100% of their stated value.  
g
Note 3: Unless noted, measurements above are made with a 1.4V supply, a 25 C ambient temperature, and an LED with a forward drop of 1.5V to 1.7V at 1 mA  
§
forward current.  
Note 4: Occasionally a flasher circuit will fail to oscillate due to an LED defect that may be missed because it only reduces light output 10% or so. Such LEDs can  
be identified by a large increase in conduction between 0.9V and 1.2V.  
3
Typical Applications (Continued) (See applications notes on previous page)  
3V Flasher  
Minimum Power at 1.5V  
TL/H/7969–8  
e
0.32 mA.  
TL/H/7969–7  
Note: Nominal flash rate: 1.1 Hz. Average I  
DRAIN  
e
Note: Nominal flash rate: 1 Hz. Average I  
0.77 mA.  
DRAIN  
Fast Blinker  
TL/H/796911  
Note: Winking LED inside, locates light in total darkness.  
TL/H/7969–9  
e
Note: Nominal flash rate: 2.6 Hz. Average I  
1.2 mA.  
DRAIN  
4
Typical Applications (Continued) (See applications notes above)  
Flashlight Finder  
TL/H/796910  
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 current through the bulb  
simplifies wiring and causes negligible loss since bulb resistance cold is typically less than 2X.  
4 Parallel LEDs  
High Efficiency Parallel Circuit  
TL/H/796912  
TL/H/796913  
e
Note: Nominal flash rate: 1.3 Hz. Average I  
2 mA.  
DRAIN  
e
1.5 mA.  
Note: Nominal flash rate: 1.5 Hz. Average I  
DRAIN  
5
Typical Applications (Continued) (See applications notes above)  
1 kHz Square Wave  
TL/H/796915  
Note: Output voltage through a 10k load to ground.  
TL/H/796914  
‘‘Buzz Box’’ Continuity and Coil Checker  
Variable Flasher  
TL/H/796917  
Note: Flash rate: 0 Hz20 Hz.  
TL/H/796916  
Note: Differences between shorts, coils, and  
a few ohms of resistance can be  
heard.  
6
Typical Applications (Continued) (See applications notes above)  
LED Booster  
Incandescent Bulb Flasher  
TL/H/796918  
Note: High efficiency, 4 mA drain. Continuous appearing light obtained by supplying  
TL/H/796919  
short, high current, pulses (2 kHz) to LEDs with higher than battery voltage available.  
Note: Flash rate: 1.5 Hz.  
Emergency Lantern/Flasher  
TL/H/796920  
Note: Nominal flash rate: 1.5 Hz.  
7
Physical Dimensions inches (millimeters)  
Molded Dual-In-Line Package (N)  
Order Number LM3909N  
NS Package Number N08E  
LIFE SUPPORT POLICY  
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL  
SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and whose  
failure to perform, when properly used in accordance  
with instructions for use provided in the labeling, can  
be reasonably expected to result in a significant injury  
to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform can  
be reasonably expected to cause the failure of the life  
support device or system, or to affect its safety or  
effectiveness.  
National Semiconductor  
Corporation  
National Semiconductor  
Europe  
National Semiconductor  
Hong Kong Ltd.  
National Semiconductor  
Japan Ltd.  
a
1111 West Bardin Road  
Arlington, TX 76017  
Tel: 1(800) 272-9959  
Fax: 1(800) 737-7018  
Fax:  
(
49) 0-180-530 85 86  
@
13th Floor, Straight Block,  
Ocean Centre, 5 Canton Rd.  
Tsimshatsui, Kowloon  
Hong Kong  
Tel: (852) 2737-1600  
Fax: (852) 2736-9960  
Tel: 81-043-299-2309  
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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.  

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