Power supply circuit with control unit

摘要

According to one embodiment, a power supply circuit includes a load switch, a switching control unit, a first control unit, and a second control unit. The load switch is connected to a power supply and switches between an ON state connecting the power supply to a load and an OFF state disconnecting the power supply from the load. The switching control unit outputs a first signal for controlling switching of the load switch between the ON and OFF states. The first control unit increases an output voltage of the load switch in a steady manner over a predetermined period of time when the load switch is switched to the ON state in response to the first signal. The second control unit causes a charging current to flow to the load switch after the first signal is output from the switching control unit.

主权项

1. A power supply circuit, comprising:
a load switch configured to switch between an ON state connecting the power supply to a load and an OFF state disconnecting the power supply from the load; a switching control unit configured to output a first signal for controlling switching of the load switch between the ON and OFF states; a first control unit configured to increase an output voltage of the load switch in a steady manner over a predetermined period of time when the load switch is switched to the ON state in response to the first signal; and a second control unit configured to adjust a charging current that flows to the load switch after the first signal is output from the switching control unit, wherein the second control unit includes:
a reference voltage generation circuit configured to generate a reference voltage,a comparator configured to compare the reference voltage and a first voltage that is applied to a control input of the load switch, anda charging circuit that is controlled by an output signal of the comparator, the charging circuit configured to cause the charging current to flow to the load switch in accordance with the output signal of the comparator.