公开(公告)号：US20200285259A1

公开(公告)日：2020-09-10

申请号：US16804994

申请日：2020-02-28

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Luca TORRISI ,  Salvatore ABBISSO ,  Cristiano MERONI

IPC: G05F1/565 ,  G05F1/575

Abstract: A voltage regulator circuit includes a first voltage regulator having a first output voltage selection pin set and producing a first output voltage based on a first digital signal received at the first output voltage selection pin set, and a second voltage regulator having a second output voltage selection pin set and producing a second output voltage based on a second digital signal received at the second output voltage selection pin set. The first and second voltage regulators are operable in a voltage tracking mode with the output voltage of the second voltage regulator tracking the output voltage of the first voltage regulator when digital signals received at the selection pin sets have a same value. An overvoltage sensor detects overvoltage events at the first voltage regulator. Control circuitry selectively avoids operation in voltage tracking mode as a result of an overvoltage event detected at the first voltage regulator.

公开(公告)号：US20130188793A1

公开(公告)日：2013-07-25

申请号：US13692789

申请日：2012-12-03

Applicant: STMicroelectronics (Shenzhen) R&D CO. LTD. ,  STMicroelectronics, S.r.l.

Inventor： XiangSheng LI ,  Cristiano MERONI ,  Mei YANG ,  XianFeng XIONG

IPC: H03G11/00

CPC classification number: H03G3/348 ,  H03F1/52 ,  H03F3/183 ,  H03F3/21 ,  H03F2200/321 ,  H03F2200/375 ,  H03F2200/471 ,  H03F2200/78 ,  H03G11/00 ,  H04R1/00 ,  H04R3/007 ,  H04R2201/028 ,  H04R2499/13

Abstract: A method of operating a speaker system including a speaker coupled to an amplifier, and a dedicated digital speaker protection circuit includes turning on the amplifier in a mute mode, after a first delay period, issuing a play command to the amplifier to place the amplifier in a play mode, but without an input signal during a second delay period, and performing a speaker offset detection during the second delay period, wherein, if there is an offset, then the amplifier is forced back into the mute mode, and if there is no offset, then the amplifier is allowed to continue to operate in the play mode. The method also includes issuing a speaker protection control signal or command if an offset is detected.