Method and circuit arrangement for the regulated driving of a switching transistor of a switched-mode regulator

摘要

In the case of a pulse-width-controlled switched-mode regulator, it is proposed to supply the comparison sawtooth signal to the pulse-width modulator very briefly and only once per switching cycle. Subsequently, the signal obtained in the pulse-width-modulator stage is electronically extended, to be precise by a factor proportional to the magnitude of the output voltage of the switched-mode regulator (Fig. 1). <IMAGE>