Automatic device for the ignition and control of a gas apparatus comprising at least one burner for regulating the flow of gas from a main pipe towards a nozzle associated with the burner; a spark circuit suitable for generating a pilot flame upon receipt a electric start signal; electrically controlled valve means associated to said at least one burner; at least one supply voltage provided by the electricity main and/or by battery means, to supply said automatic device; an electrical microprocessor unit in said automatic device to drive and to control both said valve means and said spark circuit; at least one actuator circuit activated by said electrical microprocessor unit through an activation signal having a pulse train to dynamically bias said valve means and to regulate its charge state according to the duty cycle of the pulse train. The present invention also concerns a method for driving the automatic device for the ignition and control of a gas apparatus.