Denso Corporation

Hiroyuki Kawabata

Hiroyuki Ban

Junichi Nagata

Kiyoshi Yamamoto

Masahiro Kitagawa

Hirokazu Itakura

Shinichi Maeda

A constant voltage circuit robust to the input voltage lowering is disclosed. The invention is applied to a constant voltage circuit fed with an input voltage through first and second power conductors for transferring the input voltage to a load as an output voltage through an output transistor. An inventive constant voltage circuit is provided with a substitute circuit, responsive to a detection of the lowing of the input voltage to a predetermined voltage, for providing a substitute output path that is connected in parallel with the output transistor. Doing this minimize the degree of lowering of the second voltage due to the lowering of said first voltage. The output transistor may be nay of NPN and PNP transistors and P-type and N-type MOS FETs.

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Kariya, Japan

Hiroyuki Kawabata