Patent ID: 9203316
Filing Date: 2015-12-01
Classification: G05F,H02M,Y02B

Abstract:
1. A DC-DC converter comprising: a first switching element and a second switching element configuring a high-side switch and a low-side switch, respectively, and configured to output an output voltage to an output node; a pulse signal generating circuit configured to detect the output voltage, and to generate a pulse signal used to control on/off periods of said first and second switching elements based on a comparison result of the detected output voltage and a reference voltage, to set the output voltage to a predetermined voltage; a minimum pulse width limiting circuit configured to generate a minimum pulse width signal having a minimum pulse width which is wider than a minimum pulse width of the pulse signal; a selector configured to select one of the pulse signal and the minimum pulse width signal as a selection pulse signal; a driver circuit configured to switch said first switching element and said second switching element based on the selection pulse signal such that one of said switching elements is set to an off state in response to the other of said switching elements being set to an on state; and a reverse current detecting circuit configured to detect a reverse current flowing through one, which is in an on state, of said first switching element and said second switching element, in response to the one switching element is in the on state, wherein said driver circuit controls said first or second switching element, through which the reverse current flows, to be set to an off state, in response to the reverse current being detected, and wherein said selector selects the pulse signal in response to the reverse current not being detected, and in response to the reverse current being detected, said selector selects a signal with a greater pulse width of the minimum pulse width signal and the pulse signal, as a selection signal.