Power supply apparatus which suprresses output voltage variation

摘要

According to one embodiment, the voltage divider circuit divides the output voltage, and generates a feedback voltage. The output voltage switching transistor has one end connected to a feedback voltage side, and operates based on an output voltage switching signal. The first condenser has one end connected to the one end of the output voltage switching transistor, and the other end connected to a control terminal of the output voltage switching transistor.

主权项

1. A power supply apparatus, comprising:
a first transistor configured to output an output voltage; a voltage divider circuit configured to divide the output voltage; a second transistor including a first end connected to an output node of the voltage divider circuit, the second transistor being configured to operate based on an output voltage switching signal; a first condenser provided between the first end of the second transistor and a control terminal of the second transistor; a differential amplifier circuit configured to amplify a voltage from the voltage divider circuit based on a reference voltage, the differential amplifier circuit being configured to receive a first feedback voltage when the second transistor is turned on, and to receive a second feedback voltage, which is higher than the first feedback voltage, when the second transistor is turned off; a first inverter configured to output the output voltage switching signal to the control terminal of the second transistor; a first constant current source configured to output an input voltage to the first inverter; and a second constant current source provided between the first inverter and a low-potential power supply.