| 摘要 |
PURPOSE:To reduce the switching loss and to enhance efficiency of a DC-DC converter by a method wherein a control circuit is controlled by a synchronizing delay circuit provided as to symchronize with a control signal of a transistor. CONSTITUTION:A synchronizing delay circuit C made as to synchronize with the control signal of a transistor S is provided. A control circuit A is controlled by the delay circuit C to make ON operation of a transistor Q for control to be performed after delayed for the necessary time from ON operation of the transistor S, and OFF operation of the transistor Q for control is made to be performed before OFF operation of the transistor S by control of pulse duration to be generated by the trailing edge of a pulse duration control signal. Accordingly because switching operation of the transistor S is performed in no load condition, the switching loss to be generated during the period thereof is reduced, and efficiency of the converter can be enhanced. |
