Multiple output switching power source apparatus

A multiple-output switching power source apparatus includes a control circuit to adjust a time for applying a DC voltage to a primary winding of a transformer by turning on/off a switching element Q, a first rectifying-smoothing circuit for a first secondary winding of the transformer, a second rectifying-smoothing circuit for a switching element Q to provide a second output voltage connected to an output terminal of the first rectifying-smoothing circuit through the switching element Q, a third rectifying-smoothing circuit for a second secondary winding of the transformer and provide a third output voltage, a first end of the second secondary winding of the transformer being connected to the switching element Q, and a control circuit to adjust an ON/OFF time of the switching element Q according to the voltage of the first secondary winding of the transformer, the second output voltage, and the third output voltage.