Patent ID: 7456623
Filing Date: 2008-11-25
Classification: H02M,H03K

Abstract:
1. A DC-DC converter for generating an output voltage from an input voltage, the DC-DC converter comprising: a first transistor for receiving the input voltage; a second transistor connected to the first transistor; a comparator, connected to the second transistor, for detecting current flowing through a choke coil to generate a switching control signal for controlling the second transistor to turn on and off, the choke coil connected to a node between the first transistor and the second transistor; a control circuit, connected to the first transistor, for controlling the first transistor to turn on and off so as to keep the output voltage constant; and a pulse generation circuit, connected to the control circuit, for generating a pulse signal for turning off the second transistor during a predetermined period from before the first transistor is turned on to after the first transistor is turned on, wherein the pulse generation circuit comprises: