LM3909 Datasheet, PDF (3/8 Pages) National Semiconductor (TI) – LM3909 LED Flasher/Oscillator

Typical Applications (Continued)(See applications notes below)
Warning Flasher High Voltage Powered
Typical Operating Conditions
Nominal
V^a
Flash Hz
C_T
R_S R_FB V^a_RANGE
6V
2
400 mF 1k 1 5k 5V – 25V
15V
2
180 mF 3 9k 1k 13V – 50V
100V
17
180 mF ^43k 1k 85V – 200V
1W
TL H 7969 – 4
1 5V Flasher
TL H 7969 – 6
Estimated Battery Life
(Continuous 1 5V Flasher Operation)
Note Nominal flash rate 1 Hz
TL H 7969 – 5
Size Cell
AA
C
D
Type
Standard
Alkaline
3 months
7 months
1 3 years
6 months
15 months
2 6 years
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
Note 2 Flash rates and frequencies assume a g5% capacitor tolerance Electrolytics may vary b20% to a100% of their stated value
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