Hi
Some of our products use TPS23754 T2P to make PSE af and at judgment. The circuit is as follows.
Now there is a doubt that the results on Cisco network management switch Cisco WS-C2960X-48LPS-L and Cisco WS-C3750-48P do not match the design function.
Both Cisco switches support at, but because of the built-in power supply, the default is to limit the maximum output to the maximum power of af, which can be achieved by changing the configuration.
How does TPS23754 T2P achieve af and at depends on one event and two events? Rather than what we understand is that power levels are used to
determine.
af: one event, maximum power 13W,
at: two event, maximum power 25.5W,
The problem is that the query power level of PSE is Class 4 (802.3at), but the output of T2P is high, which is equivalent to my judgment circuit to determine that it is AF (not in line with the actual situation).
The PSE used in conjunction with TPS2388R chip, the output is one event mode (waveform as follows)
Regards,
Jerry
