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Line-voltage detection method, power controller and power supply with brown-out protection and brown-in mechanism
Line-voltage detection method, power controller and power supply with brown-out protection and brown-in mechanism
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机译:线电压检测方法,电源控制器和具有欠压保护和欠压机制的电源
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摘要
A power controller makes use of a line-voltage detection method to perform brown-out protection and brown-in mechanism. The power controller has a high-voltage node connected via a current-limiting resistor to a line voltage, and a high-voltage startup transistor connected to the high-voltage node. The input voltage at the high-voltage node is divided to provide a fraction result. An offset current flowing through the high-voltage startup transistor and the current-limiting resistor is provided in response to the fraction result. The offset current is stopped in response to the fraction result when the offset current flows through the high-voltage startup transistor and the current-limiting resistor.
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