Dual mode clock generator

Dual-mode clock generator in accordance with one embodiment of the invention, the first operation mode, the first and second control generation of charge and discharge current according to the electric current, and the second operation mode to the initial state according to the soft-start signal a frequency control unit for controlling the generation of charge and discharge current in accordance with a third current and a fourth current to distinguish between a steady state; The first operation mode when the first generating a charging current corresponding to the first current, and the second operating mode during the initial state and a current source unit for separately according to the normal condition generates the charging current in accordance with a third current and a fourth current .; A capacitor for charging a voltage according to the charging current generated by the current source unit; Oscillation control unit for controlling the switch-on or switch-off for charging and discharging of the capacitor; Switches for controlling the charging and discharging of the capacitor in accordance with the ON or OFF control of the oscillation control; And to generate a discharge current corresponding to the second current when the first operation mode, and generate the second mode of operation when the discharge current of the third current and a fourth current, separated according to the initial state or the normal state, the using a discharge current and include a current sink to discharge the charged voltage of the capacitor. Power supplies, DC / DC converters, the dual mode, the clock generator