Patent ID: 7176663
Filing Date: 2007-02-13
Classification: H02M,Y02B

Abstract:
1. A control circuit for controlling an output voltage of a DC/DC converter, wherein the DC/DC converter includes a main switching element and a synchronous switching element, the control circuit comprising: a pulse signal generation circuit which generates a pulse signal for controlling the output voltage of the DC/DC converter based on the output voltage; and a drive signal generation circuit connected to the pulse signal generation circuit in which the drive signal generation circuit generates first and second drive signals using the pulse signal for respective supply to the main switching element and the synchronous switching element such that the main switching element and the synchronous switching element are turned ON and OFF alternately at different timings as a result of receiving the first and second drive signals, and the drive signal generation circuit generates the first drive signal such that the first drive signal has the same pulse width as that of the pulse signal, wherein the drive signal generation circuit generates the second drive signal having a pulse width greater than that of the first drive signal when the first drive signal is supplied to the main switching element, and wherein the drive signal generation circuit includes: a first delay circuit which generates the first drive signal by delaying the pulse signal; a second delay circuit connected to the first delay circuit, the second delay circuit generating a delayed signal by delaying the first drive signal; and a synthesis circuit connected to the second delay circuit, and the synthesis circuit generating the second drive signal by synthesizing the pulse signal with the delayed signal.