Power supply device

A device comprising:

• a power source configured to supply a first voltage;
• a USB-C connector;
• and
• a connection interface coupled between the power source and the USB-C connector, the connection interface including:
• a voltage converter configured to supply, from the first voltage, a second voltage on an output terminal of the converter having a current value determined by a third voltage on a control terminal of the converter, the output terminal of the converter being coupled to the USB-C connector;
• a ramp generation circuit configured, when a set point value of the second voltage switches from a first set point value to a second set point value smaller than the first set point value, to generate a first signal that includes a ramp successively representative of the first set point value, of a plurality of decreasing intermediate values between the first and second set point values, and of the second set point value;
• an error amplifier configured to supply a second signal representative of a difference between the first signal and a third signal representative of the current value of the second voltage;
• and
• a feedback control circuit configured to set the third voltage based on the second signal.

A method, comprising:

• controlling a voltage converter supplying, from a first voltage, a second voltage having a current value determined by a third voltage, the controlling including, when a set point value of the second voltage switches from a first set point value to a second set point value smaller than the first set point value;
• generating a first ramp signal successively representative of the first set point value, of a plurality of decreasing intermediate values in a range from the first and second set point values, and of the second set point value;
• an error amplifier supplying a second signal representative of a difference between the first signal and a third signal representative of the current value of the second voltage;
• and
• determining the third voltage from the second signal.