Patent ID: 6091232
Filing Date: 2000-07-18
Classification: H02M

Abstract:
A DC/DC conversion circuit having at least one input terminal and an output terminal, and being adapted to convert a DC input voltage to a DC output voltage, which circuit comprises:an inductor adapted to transfer energy from said input terminal to said output terminal;a capacitor connected to the output terminal for storing energy transferred from the inductor;a first electronic switch coupling the inductor to a reference voltage;a second electronic switch coupling the inductor to the output terminal, wherein the second electronic switch has at least a first terminal connected to a terminal of the inductor and has a second terminal coupled to the output terminal of the converter, and comprises a power transistor having a main conduction path connected between said first and second terminals and a control circuit which senses a difference of potential between said first and second terminals and drives the power transistor, wherein the control circuit comprises a drive block adapted to drive the power transistor and a compare block supplying an enable signal to the drive block, which compare block has at least three input terminals connected to said first terminal, said second terminal, and said input terminal of the control circuit, respectively.