TAS5611

SLAS681 – DECEMBER 2009

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APPLICATION INFORMATION

PCB MATERIAL RECOMMENDATION

FR-4 Glass Epoxy material with 2 oz. (70

μm) is recommended for use with the TAS5611. The use of this

material can provide for higher power output, improved thermal performance, and better EMI margin (due to

lower PCB trace inductance).

PVDD CAPACITOR RECOMMENDATION

The large capacitors used in conjunction with each full-bridge, are referred to as the PVDD Capacitors. These

capacitors should be selected for proper voltage margin and adequate capacitance to support the power

requirements. In practice, with a well designed system power supply, 1000

μF, 50V will support more

applications. The PVDD capacitors should be low ESR type because they are used in a circuit associated with

high-speed switching.

DECOUPLING CAPACITOR RECOMMENDATIONS

To design an amplifier that has robust performance, passes regulatory requirements, and exhibits good audio

performance, a quality decoupling capacitors should be used. In practice, X7R should be used in this application.

The voltage of the decoupling capacitors should be selected in accordance with good design practices.

Temperature, ripple current, and voltage overshoot must be considered. This fact is particularly true in the

selection of the 2

μF that is placed on the power supply to each half-bridge. It must withstand the voltage

overshoot of the PWM switching, the heat generated by the amplifier during high power output, and the ripple

current created by high power output. A minimum voltage rating of 50V is required for use with a 32.5V power

supply.

SYSTEM DESIGN RECOMMENDATIONS

The following schematics and PCB layouts illustrate best practices used for the TAS5611.

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Product Folder Link(s): TAS5611