Automatic bandwidth and stability control for switched pulse width modulation voltage regulator

A control circuit for a switching voltage regulator circuit, the control circuit comprising:

• a measuring circuit having a first input terminal coupled to an output terminal of the switching voltage regulator circuit and a second input terminal coupled to an output of a switch drive circuit of the switching voltage regulator circuit, the measuring circuit being configured to generate a phase difference signal responsive to an output voltage signal at the output terminal of the switching voltage regulator circuit and an output signal of the switch drive circuit;
• a transfer function control circuit having a first input terminal for receiving the phase difference signal, the transfer function control circuit being configured to generate a transfer function control signal responsive to the phase difference signal such that the transfer function control signal causes at least one of a first zero or pole to be introduced to a transfer function of a voltage control feedback loop of the switching voltage regulator circuit;
• and
• a variable characteristic element disposed in the current control feedback loop having a variable characteristic that varies responsive to the transfer function control signal.