Generating a regulated signal from another regulated signal

摘要

An embodiment of a method includes generating a regulated output signal from a regulated intermediate signal in response to a reference signal and the regulated output signal, and generating the regulated intermediate signal from an input signal in response to the regulated output signal and the regulated intermediate signal. By generating one regulated signal (e.g., a regulated output voltage) from another regulated signal (e.g., a regulated intermediate voltage), the magnitude of the ripple component of the one regulated signal may be reduced. Furthermore, by generating the regulated intermediate signal in response to the regulated output signal, the efficiency of the regulation may be increased.

主权项

1. A power supply controller, comprising:
an output regulator control circuit configured to cause a low dropout output-signal generator to generate a regulated output signal from a regulated intermediate signal in response to a reference signal and in response to a regulated output feedback signal; an intermediate regulator control circuit coupled to the output regulator control circuit and configured to cause an intermediate buck or buck-boost signal generator to generate the regulated intermediate signal from an input signal in response to the regulated output feedback signal and the regulated intermediate signal; and an offset feedback circuit coupled between the intermediate regulator control circuit and the output regulator control circuit and configured to adjust the regulated output feedback signal.