Patent ID: 6538418
Filing Date: 2003-03-25
Classification: H02M,Y02B

Abstract:
A driving signal supply circuit supplying driving signals to the first and the second switching transistors of a switching regulator comprising the first switching transistor connected between a power supply voltage supply terminal and a first node; the second switching transistor connected between the first node and a reference voltage supply terminal, which can be in a conductive state when the first switching transistor is in a cut-off state; a coil with one end connected to the first node; and a smoothing capacitor connected between the other end of the coil and the reference voltage supply terminal,said driving signal supply circuit comprising: a comparing circuit, which compares a first detected voltage corresponding to the output voltage of the switching regulator with a first reference voltage and outputs a first comparison signal; a first driving circuit, which inputs the first comparison signal and outputs a first driving signal to drive the first switching transistor; a second driving circuit, which inputs the first comparison signal and outputs a second driving signal to drive the second switching transistor; a second comparing circuit, which compares a second detected voltage corresponding to the voltage of the first node with a second reference voltage and outputs a second comparison signal; and a logic circuit, which inputs the second comparison signal and outputs an inhibiting signal to inhibit conduction of the second switching transistor.