Patent ID: 6166526
Filing Date: 2000-12-26
Classification: H02M

Abstract:
A DC/DC converter comprising a switching transistor (1), an inductor (2), a smoothing capacitor (3), and a switching element (4) which are connected so as to convert an input voltage U.sub.E to an output voltage U.sub.A greater or less than the input voltage, and a comparator (5) having a first input connected to the switching transistor (1), and a second input connected to a reference transistor (7) and a reference current source (6) so as to fix a predetermined switching threshold of the comparator (5) at the second input, wherein the switching transistor (1) and the reference transistor (7) are MOS transistors, the reference transistor (7) is operated in a triode region, and, in the on state of the switching transistor (1), the ratio of a gate-source voltage of the switching transistor to a gate-source voltage of the reference transistor (7) is constant.