Dc-dc converter and display apparatus having the same

The DC-DC converter includes a power switch and a switching controller. The power switch produces an output DC voltage based on the input DC voltage repeatedly turned on and off. The switching controller controls the operation of the power switch. It said switching controller comprises a slew-rate controller for varying the slew rate of the voltage of one switch of the power switch with time. Accordingly, the broadband noise power generated by the DC-DC converter can be reduced effectively.