Self-adjust Input Output Low Power White LED Drive Circuit base on PMOS

White LED is a new lamp-house product of strong develop potential. White LED is provided with some strongpoint of small bulk. low heat, low power deplete, long working life, rapidness response, environment. Supply by batter(yone battery)is a direction of low power white LED drive circuit. We design the white LED drive circuit drived by pulse, and that use one battery and few periphery apparatus, and have no user for output capacitance. This circuit can self-adjust work state follow the change of supply power, and can be widely used in white LED illumination of low current.