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AN2487 Fiches technique(PDF) 23 Page - STMicroelectronics

No de pièce AN2487
Description  power over Ethernet powered device demonstration board
PDF  32 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2487 Fiches technique(HTML) 23 Page - STMicroelectronics

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AN2487
Electrical characteristics
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The graphs above were run out to 0.8 A to show that loading can be traded off between the
two outputs with very little effect on output voltage. Note, however, that at very light loads the
cross regulation suffers. If light load operation is required, pre-loads may be necessary.
4.7.3
Startup and shutdown
●
Channel 1 = 12 V output
●
Channel 2 = 3.3 V output
A slight voltage overshoot is visible as the control loop comes into play. This was not
regarded as serious enough to require correction.
Figure 22.
57 V shutdown full load
●
Channel 1 = 12 V output
●
Channel 2 = 3.3 V output
Figure 20.
42 V full load startup
Figure 21.
57 V full load startup



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