State machine enabling auto-recovery of short-circuited...

Details State machine enabling auto-recovery of short-circuited... State machine enabling auto-recovery of short-circuited...

2004-10-19

2009-12-22

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

With amplifier

C381S055000, C330S20700P, C330S251000, C330S298000

Reexamination Certificate

active

07636446

ABSTRACT:
Methods and apparatus for enabling auto-recovery of a digital audio amplifier after a short-circuit are disclosed. In accordance with one embodiment, a short-circuit is detected by both detecting a switching signal at an output of the digital audio amplifier and sensing a mute signal coupled to the digital audio amplifier. Once a short-circuit has been detected, a reset signal is provided to a reset input of the digital audio amplifier when the switching signal indicates that the digital audio amplifier is not switching and the mute signal indicates that the amplifier is in an un-muted state.

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“TPA3008D2: 10-W Stereo Class-D Audio Power Amp”, http://focus.ti.com/docs/prod/folders/print/tpa3008d2.html Texas Instruments, downloaded from Internet on Feb. 8, 2004 3 pages.
“TPA3004D2: 12-W Stereo Class-D Audio Power Amplifier With DC Volume Control”, Texas Instruments Data Sheet, SLOS407C—Feb. 2003, Revised Jan. 2004, 40 pages.
Pauly, Donald E., “High Fidelity Switching Audio Amplifiers Using TMOS Power MOSFETs”, ON Semiconductor Publication No. AN1042/D, Aug. 2002—Rev. 3, 12 pages.

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