TPA3118D2DAP datasheet(22/45 Pages) TI

Part #	TPA3118D2DAP

Description	15-W, 30-W, 50-W Filter-Free Class-D Stereo Amplifier Family With AM Avoidance

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Manufacturer	TI [Texas Instruments]

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TPA3116D2, TPA3118D2, TPA3130D2

SLOS708G – APRIL 2012 – REVISED DECEMBER 2017

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Product Folder Links: TPA3116D2 TPA3118D2 TPA3130D2

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Figure 34. TPA311xD2 Radiated Emissions

7.3.15 When to Use an Output Filter for EMI Suppression

The TPA3116D2 has been tested with a simple ferrite bead filter for a variety of applications including long

speaker wires up to 125 cm and high power. The TPA3116D2 EVM passes FCC class-B specifications under

these conditions using twisted speaker wires. The size and type of ferrite bead can be selected to meet

application requirements. Also, the filter capacitor can be increased if necessary with some impact on efficiency.

There may be a few circuit instances where it is necessary to add a complete LC reconstruction filter. 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 the figures below 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 means to pass LCI tests. Common mode chokes using

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

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