Fast and dynamic vout-tracking control for audio input signal

A control circuit for a switching converter, comprising:

• a first audio input pin configured to receive a first audio signal having a first amplitude;
• a second audio input pin configured to receive a second audio signal having a second amplitude;
• an output pin configured to provide an output voltage, wherein the output voltage has a default voltage;
• and
• a high value selection circuit configured to generate a high value signal according to the first audio signal and the second audio signal, wherein the high value signal has an amplitude that is a maximum of the first amplitude and the second amplitude;
• wherein when the high value signal increases to be greater than a first threshold voltage but lower than a second threshold voltage, the output voltage increases to a first voltage, wherein the second threshold voltage is greater than the first threshold voltage;
• when the high value signal increases to be greater than the second threshold voltage, the output voltage increases to a second voltage, wherein the first voltage is greater than the default voltage, and the second voltage is greater than the first voltage.

A control circuit for a switching converter, comprising

• a first audio input pin configured to receive a first audio signal having a first amplitude;
• a second audio input pin configured to receive a second audio signal having a second amplitude;
• an output pin configured to provide an output voltage, wherein the output voltage has a default voltage;
• and
• a voltage control circuit configured to compare a maximum of the first amplitude and the second amplitude with multiple voltage intervals, and provide the output voltage according to the comparison result;
• wherein each of the multiple voltage intervals corresponds to each of multiple voltage values of the output voltage;
• and
• when the maximum of the first amplitude and the second amplitude is within a first voltage interval, the output voltage is a first voltage corresponding to the first interval.