Active transient response circuits, system and method for digital multiphase pulse width modulated regulators

A digital controller for a multiphase power regulator comprising:

• a multiphase pulse width modulator (PWM) configured to drive a plurality of phase signals wherein only a single phase signal is active at a time and at least one phase is inactive during normal operation;
• an active transient response (ATR) circuit coupled the PWM, wherein the active transient response circuit is configured to:
• measure an output voltage;
• detect multiple threshold levels of deviations of the output voltage from the predetermined voltage level;
• and
• generate a compensation signal, wherein the compensation signal drives the PWM to modify the phase signals according to the number of thresholds that have been exceeded;
• and
• an adaptive voltage positioning (AVP) circuit comprising an adaptive bandwidth filter configured to have selectable bandwidth comprising a narrow bandwidth and a wide bandwidth, and to be adjusted according to a threshold being exceeded.

A digital controller for a multiphase power regulator comprising:

• a multiphase pulse width modulator (PWM) driving a plurality of phase signals wherein only a single phase signal is active at a time and at least one phase is inactive during normal operation;
• an active transient response (ATR) circuit coupled the PWM, wherein the active transient response circuit is configured to:
• measure an output voltage;
• detect multiple threshold levels of deviations of the output voltage from the predetermined voltage level;
• generate a compensation signal, wherein the compensation signal drives the PW to modify the phase signals according to the number of thresholds that have been exceeded;
• and
• an adaptive voltage positioning (AVP) circuit comprising:
• an adaptive bandwidth filter configured to have selectable bandwidth comprising a narrow bandwidth and a wide bandwidth;
• and
• a summing circuit configured to receive pre-determined current values corresponding to the one or more of the multiple threshold values that have been exceeded, add the pre-determined current values to a detected current at a power stage and provide a sum of the detected current and the pre-determined current values to the adaptive bandwidth filter.