Datasheet

1 nF
Ferrite
Chip Bead
OUTP
OUTN
Ferrite
Chip Bead
1 nF
4 Ω or Greater
1 µF
15 µH
15 µH
OUTP
OUTN
4 Ω
Ferrite
Chip Bead
Ferrite
Chip Bead
0.22 mF
1 nF
0.22 mF
1 nF
0.47 µF
33 µH
33 µH
OUTP
OUTN
8 Ω
Ferrite
Chip Bead
Ferrite
Chip Bead
0.1 mF
1 nF0.1 mF
1 nF
TPA3001D1
SLOS398E –DECEMBER 2002–REVISED AUGUST 2010 www.ti.com
For example, consider an application in which the TPA3001D1 drives an 8-Ω speaker from an 18-V power
supply. The maximum output power with no distortion (less than 1% THD) is 16 W, which corresponds to a
maximum peak output voltage of 16 V. For the same output voltage level driven into clipping (10% THD), the
output power is increased to 20 W.
OUTPUT FILTER CONSIDERATIONS
A ferrite bead filter (shown in Figure 34) should be used in order to pass FCC and/or CE radiated emissions
specifications and if a frequency-sensitive circuit operating higher than 1 MHz is nearby. The ferrite filter reduces
EMI around 1 MHz and higher (FCC and CE only test radiated emissions greater than 30 MHz). When selecting
a ferrite bead, choose one with high impedance at high frequencies, but very low impedance at low frequencies.
Use an additional LC output filter if there are low frequency (<1 MHz) EMI sensitive circuits and/or there are long
wires (greater than 11 inches) from the amplifier to the speaker, as shown in Figure 35 and Figure 36.
Figure 34. Typical Ferrite Chip Bead Filter (Chip Bead Example: Fair-Rite 2512067007Y3)
Figure 35. Typical LC Output Filter for 4-Ω Speaker, Cutoff Frequency of 27 kHz
Figure 36. Typical LC Output Filter for 8-Ω Speaker, Cutoff Frequency of 27 kHz
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Product Folder Link(s): TPA3001D1