公开(公告)号：US20240014729A1

公开(公告)日：2024-01-11

申请号：US18214751

申请日：2023-06-27

Applicant: STMicroelectronics S.r.l.

Inventor： Edoardo BOTTI ,  Giovanni GONANO ,  Marco RAIMONDI

IPC: H02M1/32 ,  H02M3/157 ,  H02M1/00 ,  H03F3/217

CPC classification number: H02M1/32 ,  H02M3/157 ,  H02M1/0009 ,  H03F3/217

Abstract: A half bridge switching power stage includes high/low side switches driven in response to a cycle-by-cycle protected driving signal derived from a PWM signal. Signals indicative of detected over-currents at said high/low side switches are processed to output the cycle-by-cycle protected driving signal, when the signal indicative of the detected over-current indicates, during a time interval within which the high/low side switch is turned on, that current flowing in the turned on high/low side switch crosses a given threshold, as an inverted PWM signal by turning off the turned on high/low side switch, and otherwise outputting said cycle-by-cycle protected driving signal as a not inverted PWM signal. An anomaly detection circuit receives the signals indicative of the over-current and switches off both the high/low side switches when an anomaly is detected in a pattern of over-current events in the signals indicative of the over-current.

公开(公告)号：US20230336136A1

公开(公告)日：2023-10-19

申请号：US17719613

申请日：2022-04-13

Applicant: STMicroelectronics S.r.l.

Inventor： Francesco STILGENBAUER ,  Paolo CACCIAGRANO ,  Giovanni GONANO

IPC: H03G3/34 ,  H04R3/00

CPC classification number: H03G3/344 ,  H04R3/00 ,  H04R2430/01 ,  H03G2201/103

Abstract: A digital audio playback circuit includes a noise shaping circuit configured to receive an input digital audio signal, and a digital to analog converter (DAC) configured to convert the input digital audio signal to a pre-amplified output analog audio signal according to a gain ramp defined by a gain control signal. A muting circuit is configured to compare input digital audio signal to a threshold and assert a mute control signal when the input digital audio signal is below the threshold. An analog gain control ramp circuit is configured to generate the gain control signal in response to the mute control signal to cause the gain ramp to ramp down. An amplifier is configured to amplify the pre-amplified output analog audio signal for playback by an audio playback device.