TAS5614A

SLAS712 – JUNE 2010

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APPLICATION INFORMATION

PCB MATERIAL RECOMMENDATION

FR-4 Glass Epoxy material with 2oz. (70mm) is recommended for use with the TAS5614A. 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, 1000mF, 50V 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 RECOMMENDATION

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

performance, good 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 0.1mF 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 36V power

supply.

SYSTEM DESIGN RECOMMENDATIONS

The following schematics and PCB layouts illustrate best practices in the use of the TAS5614A.

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