What is power good and power fail signals and how can use it?

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. This is usually used for monitoring and controlling purposes.

  • Power Good: after the output of a power supply reaches 90% rated voltage, a TTL signal (about 5V) will be sent out within the next 10-500ms.
  • 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.
Categories: Industrial, Medical, Operation
Tags: Power Fail, Power Good, TTL

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