TAS5615

SLAS595B – JUNE 2009 – REVISED FEBRUARY 2010

www.ti.com

APPLICATION INFORMATION

PCB MATERIAL RECOMMENDATION

FR-4 glass epoxy material with 2 oz. (70 mm) is recommended for use with the TAS5615. 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 mF, 63 V 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

In order 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 2.2 mF 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 63 V is required for use with a 50-V power

supply.

SYSTEM DESIGN RECOMMENDATIONS

The following schematics and PCB layouts illustrate best practices in the use of the TAS5615.

16

Submit Documentation Feedback

Copyright © 2009–2010, Texas Instruments Incorporated

Product Folder Link(s) :TAS5615