AN2487 datasheet(23/32 Pages) STMICROELECTRONICS

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AN2487 Scheda tecnica(PDF) 23 Page - STMicroelectronics

Il numero della parte	AN2487

Spiegazioni elettronici	power over Ethernet powered device demonstration board

PDF	32 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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23 / 32 page

AN2487

Electrical characteristics

23/32

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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