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AN2487 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN2487
Description  power over Ethernet powered device demonstration board
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2487 Datasheet(HTML) 25 Page - STMicroelectronics

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AN2487
Electrical characteristics
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4.8
Ripple and noise
●
Channel 1 = 12 V output
●
Channel 2 = 3.3 V output
4.8.1
Radiated EMI
For an idea of the noise level the converter will place on the Ethernet cable, the noise
between the two “ground” planes on the back of the PC board was measured. The signal
was run directly into the 50
Ω input of a spectrum analyzer. Please ignore the pass limit
notation.
Figure 27.
Spectrum of noise between output and input ground planes
The noise level peaks at 54 dB, about 1/2 mV, at approximately 63 MHz. Radiated noise
should not be a problem.
Figure 25.
Switching frequency ripple, two
cycles shown
Figure 26.
Expanded switching transient



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