发明申请
US20060262473A1 Output current control and overload protection in digital audio amplifiers
有权
数字音频放大器的输出电流控制和过载保护
- 专利标题: Output current control and overload protection in digital audio amplifiers
- 专利标题(中): 数字音频放大器的输出电流控制和过载保护
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申请号: US11335028申请日: 2006-01-19
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公开(公告)号: US20060262473A1公开(公告)日: 2006-11-23
- 发明人: Claus Neesgaard , Lars Risbo , Anker Bjorn-Josefsen
- 申请人: Claus Neesgaard , Lars Risbo , Anker Bjorn-Josefsen
- 申请人地址: US TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: US TX Dallas
- 主分类号: H02H3/08
- IPC分类号: H02H3/08
摘要:
Overcurrent and overload protection for the power output of a pulse-width-modulated digital audio system is disclosed. The overcurrent protection circuitry includes a latch that is set in responsive to output current from the power output stage that exceeds an overcurrent threshold; the output of the latch gates the pulse-width-modulated control signal to block power output for the remainder of the current pulse-width-modulated cycle; upon the end of the cycle, or the beginning of the next, the latch is cleared to enable power output in that next cycle. Overload protection is provided by circuitry including counters for counting the relative number of overcurrent cycles to normal, non-overcurrent cycles, and generating an overload signal to block power output in the event of too frequent overcurrent cycles.
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