Patent ID: 7696738
Filing Date: 2010-04-13
Classification: H02M,Y02B

Abstract:
1. A DC-DC converter generating an output voltage from an input voltage, the DC-DC converter comprising: a first transistor receiving the input voltage; a second transistor coupled to the first transistor; a choke coil including a first terminal coupled to a connection node between the first and second transistors and a second terminal outputting the output voltage; an error amplification circuit comparing the output voltage and a first reference voltage to generate an error signal; a pulse signal generation circuit generating a first pulse signal that is in accordance with the error signal; a comparison circuit comparing the error signal and a second reference voltage to generate a comparison result signal, the comparison result signal being in either one of a first logic state and a second logic state; a drive signal generation circuit receiving the comparison result signal and selectively generating either one of a constant level signal and a second pulse signal based on the comparison result signal, with the drive signal generation circuit generating the constant level signal when receiving the comparison result signal in the first logic state and generating the second pulse signal when receiving the comparison result signal in the second logic state; and an output circuit receiving the first pulse signal and either one of the constant level signal and the second pulse signal and generating first and second drive signals respectively driving the first and second transistors, with the output circuit generating the second drive signal in accordance with the first pulse signal when receiving the constant level signal and generating the second drive signal with the first and second pulse signals when receiving the second pulse signal.