Slew rate controlled power supply and associated control method

A control method for a power supply, wherein the power supply comprises a voltage regulator configured to convert an input voltage to an output voltage provided to a processor, and the processor is configured to provide a VID code and a slew rate command, the control method comprising:

• receiving the VID code and the slew rate command from the processor;
• generating a target count signal by dividing a voltage regulation step by the slew rate command;
• generating a count duration signal based on the target count signal, wherein both the target count signal and the count duration signal are digital signals, the target count signal represents a real number having an integer part and a decimal part, the count duration signal represents an integer number;
• and
• regulating the reference voltage based on the count duration signal and the VID code.

A power supply, configured to provide an output voltage to a processor, and the processor is configured to provide a VID code and a slew rate command, the power supply comprising:

• a reference regulation circuit, configured to receive the VID code and the slew rate command from the processor, configured to regulate a reference voltage based on the VID code and the slew rate command, and configured to generate a target count signal by dividing a voltage regulation step by the slew rate command;
• and
• a voltage regulator, coupled to the reference regulation circuit to receive the reference voltage, and configured to convert an input voltage to the output voltage based on the reference voltage;
• wherein
• the reference regulation circuit comprises:
• a Σ-Δ modulation unit, configured to generate a count duration signal based on the target count signal, wherein both the target count signal and the count duration signal are digital signals, the target count signal represents a real number having an integer part and a decimal part, and the count duration signal represents an integer number;
• a reference regulation unit, configured to provide a digital reference signal based on the VID code, the count duration signal and the voltage regulation step;
• and
• a DAC unit, configured to receive the digital reference signal and generate the reference voltage by converting the digital reference signal to an analog reference signal.