Testing PSE’s Overload and Short-Circuit Protection as Per AF Standard
In an ICUT test setup, the load on the port is first increased slowly till port shutdown occurs. The measured port current is clearly the actual (set) ICUT of the device (chip) on hand. To comply with the standard, that should be above ICONT and below 400 mA. Once the actual ICUT is known, an overload slightly greater than ICUT is applied for 50 ms. The port should not get shut down, indicating the PSE has the required capability to support normal bursts of transient power. Then the same overload is applied for 75 ms and the port should shut down to stay compliant.
How do we test ILIM? The AF standard, at least at some places, suggests that a short-circuit condition (i.e., ...
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