Switching converter with adaptive compensation

A transconductor circuit, comprising:

• an input stage including a first variable current source generating a variable bias current in response to a control signal, said variable bias current configured to bias a differential input transistor circuit configured to provide positive and negative input reference currents in response to a difference between a first voltage and a second voltage;
• and
• an output stage configured to provide a differential output reference current based on said positive and negative input reference currents, said differential output reference current including a positive output reference current and a negative output reference current;
• wherein said output stage includes a compensation circuit comprising:
• a second variable current source generating a first variable compensation current in response to said control signal, wherein said first variable compensation current is subtracted from the positive input reference current to generate said positive output reference current;
• and
• a third variable current source generating a second variable compensation current in response to said control signal, wherein said second variable compensation current is subtracted from the negative input reference current to generate said negative output reference current.

A method for converting a direct current input voltage into a direct current output voltage, the method comprising:

• providing a pulse-width modulated voltage according to a phase shift between a first oscillating voltage and a second oscillating voltage;
• providing the output voltage according to the input voltage and said pulse-width modulated voltage;
• providing, at an input stage of a transconductor circuit, an input reference current according to a difference between a reference voltage and an operative voltage dependent on the output voltage and according to a transconductance value associated with the transconductor circuit, and
• providing, at an output stage of the transconductor circuit, an output reference current based on said input reference current;
• phase shifting an oscillating reference voltage according to the output reference current to obtain said first and second oscillating voltages;
• regulating the transconductance value according to the input voltage, the regulation of the transconductance value resulting in a change of the input reference current;
• and
• subtracting a variable compensation current from the input reference current to generate said output reference current, wherein the variable compensation current is generated in response to the input voltage.