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OUTPUT-STAGE CIRCUIT AND METHOD FOR OVER CURRENT PROTECTION THEREOF AND AUDIO AMPLIFY SYSTEM

  • US 20140294205A1
  • Filed: 07/29/2013
  • Published: 10/02/2014
  • Est. Priority Date: 03/29/2013
  • Status: Active Grant
First Claim
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1. An output-stage circuit, comprising:

  • a high-side output driver, electrically connected to a system voltage and a first control signal;

    a first body selector, electrically connected to the high-side output driver, and the first body selector receiving a first reference voltage and the system voltage;

    a low-side output driver, electrically connected to a ground voltage and a second control signal, wherein the high-side output driver is directly connected to the low-side output driver and generating an output voltage;

    a second body selector, electrically connected to the low-side output driver, and the second body selector receiving a second reference voltage and the ground voltage; and

    an inductor, having an end electrically connected to the output voltage, and another end electrically connected to a third reference voltage, and there is an output current flowing through the inductor,wherein, when the output current is larger than a current threshold value so that the low-side output driver generates an overcurrent, the low-side output driver controlled by the second control signal is disabled and the high-side output driver controlled by the first control signal is enabled so as to create a first current channel of low impedance, and then changes current of the output current and accordingly to reduce the spiking voltage of the output voltage after an overcurrent prevention started by the low-side output driver,when the output current is larger than the current threshold value so that the high-side output driver generates an overcurrent, the high-side output driver controlled by the first control signal is disabled, and the low-side output driver controlled by the second control signal is enabled so as to create a second current channel, and then changes current of the output current and a current path and accordingly to reduce the output current and a voltage spiking of the output voltage after an overcurrent prevention started by the high-side output driver.

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