TAS5630B

www.ti.com

SLES217D – NOVEMBER 2010 – REVISED MARCH 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

8.1.1 PCB Material Recommendation

TI recommends FR-4 2-oz. (70-

μm) glass epoxy material for use with the TAS5630B. The use of this material

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

trace resistance).

8.1.2 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, 63-V supports more applications.

The PVDD capacitors should be the low-ESR type, because they are used in a circuit associated with high-speed

switching.

8.1.3 Decoupling Capacitor Recommendations

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

performance, 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-

μF capacitor that is placed on the power supply to each half-bridge. The decoupling capacitor

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.

8.1.4 System Design Considerations

A rising-edge transition on the reset input allows the device to execute the startup sequence and starts switching.

Apply audio only when the state of READY is high; that starts and stops the amplifier without having audible

artifacts that are heard in the output transducers. If an overcurrent protection event is introduced, the READY

signal goes low; hence, filtering is needed if the signal is intended for audio muting in non-microcontroller

systems.

The CLIP signal indicates that the output is approaching clipping. The signal can be used either to activate a

volume decrease or to signal an intelligent power supply to increase the rail voltage from low to high for optimum

efficiency.

The device inverts the audio signal from input to output.

The VREG pin is not recommended to be used as a voltage source for external circuitry.

Copyright © 2010–2015, Texas Instruments Incorporated

Submit Documentation Feedback

19

Product Folder Links: TAS5630B