Synchronous rectifier circuit and multiple output power supply device using the synchronous rectifier circuit

A synchronous rectifier circuit capable of controlling output voltage and multi output power supply using the same are provided to increase efficiency and to prevent cost increasing by reducing power consumption. A synchronous rectifier circuit capable of controlling output voltage comprises a semiconductor switch(Q2) and a switching control part(250). The semiconductor switch controls a current flow of the synchronous rectifier circuit. The switching control part controls the semiconductor switch according to an output control signal generated by returning an output voltage of the synchronous rectifier circuit and a synchronous rectification control signal for a synchronous rectification.