WHITE LED FLASHLIGHT DRIVER
GENERAL DESCRIPTION
ELM900x is a CMOS IC designed for driving white LEDs by one or two dry cell as a power source.
ELM900x can drive two series white LED by 1.
5V-3.
0V input voltage.
ELM900x uses an external inductor as a voltage booster.
ELM900x consists of an oscillator circuit and a driving
transistor.
The input DC power is transformed to a 35kHz constant current pulse, when the external inductor switched on and off in 35kHz.
In a standard application inductor is needed as external parts.
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FEATURES
Low cost and simple application circuit High efficiency Constant average power control Low noise 35kHz constant frequency switching Compact SOT...