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<strong>What is power good and power fail signals and how can use it?<br />
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Some power supplies provide a "Power Good" signal when they are turned on, and send out a " Power Fail" signal when they are turned off.<br />
This is usually used for monitoring and controlling purpose.<br />
Power Good: after the output of a power supply reaches 90% rated voltage, an TTL signal (about 5V) will be sent out within the next 10-500ms.<br />
Power Fail: before the output of a power supply is less than 90% rated voltage, the power-good signal will be turned off at least 1ms in advance.<br />
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