Datasheet

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 - 8W W
4 - 8W W
TPA3116D2
TPA3118D2
TPA3130D2
SLOS708C –APRIL 2012–REVISED NOVEMBER 2013 www.ti.com
Figure 34.
AM AVOIDANCE EMI REDUCTION
To reduce interference in the AM radio band, the TPA3116D2 has the ability to change the switching frequency
via AM<2:0> pins. The recommended frequencies are listed in Table 6. The fundamental frequency and its
second harmonic straddle the AM radio band listed. This eliminates the tones that can be present due to the
switching frequency being demodulated by the AM radio.
Table 6. AM Frequencies
US EUROPEAN
AM FREQUENCY (kHz) AM FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) AM2 AM1 AM0
522-540
540-917 540-914 500 0 0 1
0 1 0
917-1125 914-1122 600 (or 400)
0 0 0
1125-1375 1122-1373 500 0 0 1
0 1 0
1375-1547 1373-1548 600 (or 400)
0 0 0
0 1 0
1547-1700 1548-1701 600 (or 500)
0 0 1
PRINTED-CIRCUIT BOARD (PCB LAYOUT)
The TPA3116D2 can be used with a small, inexpensive ferrite bead output filter for most applications. However,
since the class-D switching edges are fast, it is necessary to take care when planning the layout of the printed
circuit board. The following suggestions will help to meet EMC requirements.
• Decoupling capacitors — The high-frequency decoupling capacitors should be placed as close to the PVCC
and AVCC terminals as possible. Large (100 μF or greater) bulk power supply decoupling capacitors should
be placed near the TPA3116D2 on the PVCC supplies. Local, high-frequency bypass capacitors should be
placed as close to the PVCC pins as possible. These caps can be connected to the IC GND pad directly for
an excellent ground connection. Consider adding a small, good quality low ESR ceramic capacitor between
220 pF and 1 nF and a larger mid-frequency cap of value between 100 nF and 1 µF also of good quality to
the PVCC connections at each end of the chip.
• Keep the current loop from each of the outputs through the ferrite bead and the small filter cap and back to
GND as small and tight as possible. The size of this current loop determines its effectiveness as an antenna.
• Grounding — The PVCC decoupling capacitors should connect to GND. All ground should be connected at
the IC GND, which should be used as a central ground connection or star ground for the TPA3116D2.
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Product Folder Links: TPA3116D2 TPA3118D2 TPA3130D2