Power regulator system with adaptive ramp signal generator

摘要

One embodiment includes a power regulator system. The system includes a switch control stage configured to generate at least one activation signal based on a pulse-width modulation (PWM) signal and to control a respective at least one switch to generate an output voltage. The system also includes a feedback stage configured to generate the PWM signal based on a ramp signal and a feedback voltage that is based on the output voltage. The system further includes a ramp generator stage configured to adaptively generate the ramp signal based on the output voltage and based on the at least one activation signal.

主权项

1. A power regulator system comprising:
a switch control stage configured to generate at least one activation signal based on a pulse-width modulation (PWM) signal and to control a respective at least one switch to generate an output voltage; a feedback stage configured to generate the PWM signal based on a ramp signal and a feedback voltage that is based on the output voltage; and a ramp generator stage configured to adaptively generate the ramp signal based on the output voltage and based on the at least one activation signal, wherein the ramp generator stage comprises an adaptive ripple controller configured to set a resistor-capacitor (RC) time constant of at least one RC circuit and to adjust a magnitude of a reference voltage based on the output voltage and based on the at least one activation signal, wherein the ramp signal is generated based on the at least one RC circuit, and wherein the ramp signal is compared with the reference voltage to generate the PWM signal and wherein the at least one RC circuit comprises a first RC circuit connecting the output voltage and the switching voltage and a second RC circuit connecting the output voltage and an intermediate node associated with the first RC circuit, each of the first and second RC circuits being connected to respective inputs of a voltage amplifier to generate the ramp signal.