DocID018573 Rev 2

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UM1063

Test results

7.3

Waveforms

The following images were taken on a 5 V output demonstration board. Similar waveforms

are also applicable for the 3.3 V output version.

7.3.1

Startup sequence from PoE/PoE+ injectors

Figure 16. Startup from an IEEE 802.3af injector with 2 A load

Note the inrush current limited at about 140 mA and the T2P signal not asserted.

Figure 17. Startup from an IEEE 802.3at injector with 4 A load