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TPA3118D2DAPR Datasheet(PDF) 24 Page - Texas Instruments |
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TPA3118D2DAPR Datasheet(HTML) 24 Page - Texas Instruments |
24 / 34 page ![]() 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 TPA3116D2 TPA3118D2 TPA3130D2 SLOS708B – APRIL 2012 – REVISED MAY 2012 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. 24 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Link(s): TPA3116D2 TPA3118D2 TPA3130D2 |
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