| 摘要 |
<p>An over voltage protection circuit (20), adapted for placing between a power pin (VCC) of a chip (30) and a power terminal (PT) is provided. The over voltage protection circuit (20) includes a voltage detection unit (201), a current limiting component (203), and a switch component (205). The voltage detection unit (201) is coupled between the power terminal (PT) and a ground (GND), for outputting a setting voltage (Vc) according to the voltage level at the power terminal (PT). The current limiting component (203) is coupled between the power terminal (PT) and the power pin (VCC) of the chip (30). The switch component (205) is coupled between the power pin (VCC) of the chip (30) and the ground (GND), wherein the switch component (205) is further coupled to the voltage detection unit (201) and controlled by the setting voltage (Vc). When the voltage level at the power terminal (PT) is higher than a first predetermined value, the switch component (205) conducts to cut off voltage received by the chip (30).
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