Multiple power supply system.

摘要

Among a plurality of power supply circuits (11a to 11n) arranged in a power supply monolithic integrated circuit (10), output voltages of power supply circuits (11c to 11n) except for an external microcomputer power supply circuit (11a) are monitored by a protective circuit (14). When an abnormal output appears at least one of the power supply circuits (11c), the outputs of all the power supply circuits (11c to 11n) except for the microcomputer power supply circuit (11a) are cut off.