公开(公告)号：US20200044616A1

公开(公告)日：2020-02-06

申请号：US16190427

申请日：2018-11-14

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi DAS ,  Eric J. KING ,  Xin ZHAO ,  Xiaofan FEI ,  Johann G. GABORIAU ,  Lei ZHU ,  John L. MELANSON ,  Thomas HOFF

IPC: H03F3/393 ,  H03F3/217 ,  H03F3/187 ,  H03G3/30

Abstract: A system may include a digital modulator configured to modulate an input signal received at an input of the digital modulator to generate a modulated input signal at an output of the digital modulator, a digital gain element having a digital gain and coupled to the digital modulator, an open-loop Class-D amplifier coupled to an output of the digital modulator and configured to amplify the modulated input signal, wherein the open-loop Class-D amplifier is powered from a variable power supply having a variable supply voltage which is variable in response to one or more characteristics of the input signal, and a control circuit configured to control the digital gain to approximately cancel changes in an analog gain of the open-loop Class-D amplifier due to variation in the variable supply voltage in response to the one or more characteristics of the input signal.

公开(公告)号：US20190386561A1

公开(公告)日：2019-12-19

申请号：US16441449

申请日：2019-06-14

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric J. KING ,  Siddharth MARU ,  Thomas HOFF ,  Graeme G. MACKAY

IPC: H02M1/42 ,  G05F1/46 ,  H02M3/158

Abstract: A method may include controlling switching behavior of switches of a switch-mode power supply based on a desired physical quantity associated with the switch-mode power supply, wherein the desired physical quantity is based at least in part on a slope compensation signal, generating the slope compensation signal to have a compensation value of approximately zero as seen by a compensation control loop of the switch-mode power supply, and modifying the slope compensation signal on successive switching cycles of the switch-mode power supply to account for differences in an output of the compensation control loop and an average current of an inductor of the switch-mode power supply in at least one phase of a switching period of a switching cycle of the switch-mode power supply.