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AN2487 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

tên linh kiện AN2487
Giải thích chi tiết về linh kiện  power over Ethernet powered device demonstration board
PDF  32 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2487 bảng dữ liệu(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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