LM3909 [NSC]
LM3909 LED Flasher/Oscillator; LM3909 LED闪光器/振荡器
| 型号： | LM3909 |
| 厂家： | 
National Semiconductor |
| 描述： | LM3909 LED Flasher/Oscillator |
| 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
5V–25V
15V
180 mF 3.9k
13V–50V
43k
180 mF
100V
1.7
1k
85V–200V
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/7969–11
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/7969–10
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/7969–12
TL/H/7969–13
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/7969–15
Note: Output voltage through a 10k load to ground.
TL/H/7969–14
‘‘Buzz Box’’ Continuity and Coil Checker
Variable Flasher
TL/H/7969–17
Note: Flash rate: 0 Hz–20 Hz.
TL/H/7969–16
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/7969–18
Note: High efficiency, 4 mA drain. Continuous appearing light obtained by supplying
TL/H/7969–19
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/7969–20
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
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