OUTP

OUTN

10 µH

L1

10 µH

L2

C2

C3

0.68 µF

0.68 µF

OUTP

OUTN

Ferrite

Chip Bead

1 nF

1 nF

Ferrite

Chip Bead

4

- 8

W

W

4

- 8

W

W

21

TPA3126D2

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SLOS942 – APRIL 2018

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Figure 29. TPA3126D2 Radiated Emissions-Horizontal

Figure 30. TPA3126D2 Radiated Emissions-Vertical

8.3.15 When to Use an Output Filter for EMI Suppression

A complete LC reconstruction filter should be added in some circuit instances. These circumstances might occur

if there are nearby circuits which are sensitive to noise. In these cases, a classic second order Butterworth filter

similar to those shown in Figure 31 can be used.

Some systems have little power supply decoupling from the AC line but are also subject to line conducted

interference (LCI) regulations. These include systems powered by "wall warts" and "power bricks." In these

cases, LC reconstruction filters can be the lowest-cost methods to pass LCI tests. Common mode chokes using

low frequency ferrite material can also be effective in preventing line conducted interference.

Figure 31. Output Filters