LM3909 National Semiconductor, LM3909 Datasheet - Page 5

• Manufacturer Part Number: LM3909
• Description: LM3909 LED Flasher/Oscillator
• Manufacturer: National Semiconductor

Typical Applications
Note Nominal flash rate 1 3 Hz Average I
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 2
4 Parallel LEDs
DRAIN
(Continued) (See applications notes above)
e
2 mA
TL H 7969– 12
Flashlight Finder
5
Note Nominal flash rate 1 5 Hz Average I
High Efficiency Parallel Circuit
DRAIN
e
1 5 mA
TL H 7969 – 10
TL H 7969 – 13