Patent Number: 8,716,998

Title: DC-DC converter and digital pulse width modulator

Abstract: A DC-DC converter has a switching element, a lowpass filter, an oscillator, an AD converter, an error signal generator, a counter, a comparator, a selector configured to select one of the plurality of clock signals in accordance with a value of a lower side bit of the error signal in sync with a timing when the comparator detects coincidence, and a switching controller configured to control ON/OFF of the switching element in accordance with the clock signal selected by the selector. The selector selects one among the plurality of clock signals and a new clock signal generated by combining two or more clock signals comprising neighboring phases among the plurality of clock signals.

Inventors: Namekawa; Toshimasa (Tokyo, JP), Miyashita; Daisuke (Kawasaki, JP), Deguchi; Jun (Kawasaki, JP)

Assignee: Kabushiki Kaisha Toshiba

International Classification: H02M 3/157 (20060101)

Expiration Date: 5/06/12018