POWER SUPPLY CIRCUIT, CONTROL METHOD FOR CONTROLLING POWER SUPPLY CIRCUIT, AND ELECTRONIC DEVICE INCORPORATING POWER SUPPLY CIRCUIT

摘要

A power supply circuit electrically connectable to a load, including a reference voltage circuit, having a ground voltage detection element to detect a ground terminal voltage at the ground terminal of the load, to generate a reference voltage based on the detected ground terminal voltage; an error amplifier to generate a difference voltage between and the reference voltage and a load voltage detection circuit generated based on a voltage at a power supply terminal of the load; and a control circuit to control an output voltage of the power supply circuit such that the output voltage is set to a constant voltage based on the difference voltage from the error amplifier to cause a voltage between the power supply terminal and the ground terminal of the load to set to a predetermined voltage.