OUTPUT-STAGE CIRCUIT AND METHOD FOR OVER CURRENT PROTECTION THEREOF AND AUDIO AMPLIFY SYSTEM
First Claim
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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Abstract
An output-stage circuit is disclosed. The output-stage circuit includes high-side output driver, first body selector, low-side output driver, second body selector and inductance. When output current is larger than current threshold value so as to make the low-side output driver generate overcurrent, the low-side output driver controlled by second control signal is disabled, and the high-side output driver controlled by first control signal is enabled so as to create first current channel. When output current is larger than current threshold value so as to make the high-side output driver generate 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 second current channel to avoid current flowing through low-side output driver'"'"'s body, and thus reduce the output current and voltage spiking of the output voltage.
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Citations
13 Claims
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1. An output-stage circuit, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
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9. An over-current protection method of an output-stage circuit, and the output-stage circuit comprising a high-side output driver, a first body selector, a low-side output driver, a second body selector, and an inductor, wherein the high-side output driver is electrically connected to a system voltage and a first control signal, and the first body selector is electrically connected to a high-side output driver, and receiving a first reference voltage and a system voltage, the low-side output driver is electrically connected to a ground voltage and a second control signal, and a high-side output driver is directly connected to the low-side output driver to generate an output voltage, and the second body selector is electrically connected to the low-side output driver and receives a second reference voltage and a ground voltage;
- an end of an inductor is electrically connected to the output voltage, and another end is electrically connected to a third reference voltage, and there is an output current flowing through the inductor, and the over-current protection method comprising steps as follows;
detecting a current value of an output current; determining whether there is an overcurrent at the high-side output driver or the low-side output driver; when the current value of the output current is larger than a current threshold value so that there is an overcurrent at the low-side output driver, the low-side output driver is disabled and the high-side output driver is enabled to create a first current channel so as to reduce the current value of the output current and a spiking voltage of the output voltage, and when the current value of the output current is larger than the current threshold value so that there is an overcurrent at the high-side output driver, the high-side output driver is disabled and the low-side output driver is enabled to create a second current channel so as to reduce the current value of the output current and a spiking voltage of the output voltage. - View Dependent Claims (10, 11, 12)
- an end of an inductor is electrically connected to the output voltage, and another end is electrically connected to a third reference voltage, and there is an output current flowing through the inductor, and the over-current protection method comprising steps as follows;
Specification