Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Semiconductor Software Corporation

Isao Takinoue

Yukio Fujisawa

A switching regulator is composed of digital circuits only. A switching regulator (30) comprises a driver (2) for directly controlling the operation of a switching transistor (1), and an OR gate (6) for determining the logic issued by the driver (2). An output terminal (Q) of an RS flip-flop (5) is connected to one input end of the OR gate (6), the output of a timer (40c) is applied to a set terminal (S) of the RS flip-flop (5), and the output of a comparator (4) is applied to a reset terminal (R1) through an OR gate (7). At a non-reverse input end of the comparator (4), a reference voltage (VE) is applied by a D/A convertor (40b), while a feedback voltage (VFB) is applied to a reverse input end. Accordingly, chopping of the switching transistor (1) is done on the basis of a rectangular pulse.

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Hyogo, Japan

Isao Takinoue