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PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Book 177

Table 5.12 Switching Power Supply Input Noise Limits for A-band CENELEC Compliance

Frequency (kHz)

Noise Level (dBμV):

Quasi-Peak Detector

Noise Level (dBμV):

Average Detector

9 89 N/A

70 72 N/A

70+ 30 N/A

90 30 N/A

90+ 70 N/A

150 66 56

500 56 46

5000 56 46

5000+ 60 50

30000 60 50

Table 5.13 Switching Power Supply Input Noise Limits for A-band FCC Compliance

Frequency (kHz)

Noise Level (dBμV):

Quasi-Peak Detector

9 89

70 72

70+ 30

90 30

90+ 70

450 57

450+ 48

30000 48

A PL Smart Transceiver-based device with a power supply that does not meet the appropriate power supply

input noise mask will require a filter between supply and the power mains.

An example of a filter which both attenuates switching supply noise and provides >200 ohm input impedance in the

C-band is shown in Figure 5.16. Note that both inductors must be rated for the peak AC current drawn by the power

supply.

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Elta LE100 Spezifikationen Seite 184