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TPA3221

SLASEE9 – JUNE 2017

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Copyright © 2017, Texas Instruments Incorporated

11 Power Supply Recommendations

11.1 Power Supplies

The TPA3221 device requires a single external power supplies for proper operation. A high-voltage supply,

PVDD, is required to power the output stage of the speaker amplifier and its associated circuitry. PVDD can be

used to supply an internal LDO to supply 5 V to AVDD and GVDD (connect VDD to PVDD).

Additionally, in LDO bypass mode an external power supply should be connected to VDD, AVDD and GVDD to

power the gate-drive and other internal digital and analog circuit blocks in the device.

The allowable voltage range for both the PVDD and VDD/AVDD/GVDD supplies are listed in the Recommended

Operating Conditions table. Ensure both the PVDD and the VDD/AVDD/GVDD supplies can deliver more current

than listed in the Electrical Characteristics table.

11.1.1 VDD Supply

VDD can be connected to PVDD in systems using only a single power supply. VDD is connected to an internal

LDO that is then used to supply AVDD and GVDD for digital and analog circuits as well as to supply the gate

drive.

To reduce device power consumption, the internal LDO can be bypassed by connecting VDD, AVDD and GVDD

to an external 5 V power supply.

Proper connection, routing, and decoupling techniques are highlighted in the TPA3221 device EVM User's Guide

SLVUAG8 (as well as the Application Information section and Layout Examples section) and must be followed as

closely as possible for proper operation and performance. Deviation from the guidance offered in the TPA3221

device EVM User's Guide, which followed the same techniques as those shown in the Application Information

section, may result in reduced performance, errant functionality, or even damage to the TPA3221 device. Some

portions of the device also require a separate power supply which is a lower voltage than the VDD supply. To

simplify the power supply requirements for the system, the TPA3221 device includes integrated low-dropout

(LDO) linear regulators to create these supplies. These linear regulators are internally connected to the VDD

supply and their outputs are presented on AVDD and DVDD pins, providing a connection point for an external

bypass capacitors. It is important to note that the linear regulators integrated in the device have only been

designed to support the current requirements of the internal circuitry, and should not be used to power any

additional external circuitry. Additional loading on these pins could cause the voltage to sag and increase noise

injection, which negatively affects the performance and operation of the device.

11.1.2 AVDD and GVDD Supplies

AVDD and GVDD can be supplied either through the internal LDO or from external 5 V power supply to power

internal analog and digital circuits and the gate-drives for the output H-bridges. Proper connection, routing, and

decoupling techniques are highlighted in the TPA3221 device EVM User's Guide SLVUAG8 (as well as the

Application Information section and Layout Examples section) and must be followed as closely as possible for

proper operation and performance. Deviation from the guidance offered in the TPA3221 device EVM User's

Guide, which followed the same techniques as those shown in the Application Information section, may result in

reduced performance, errant functionality, or even damage to the TPA3221 device.

11.1.3 PVDD Supply

The output stage of the speaker amplifier drives the load using the PVDD supply. This is the power supply which

provides the drive current to the load during playback. Proper connection, routing, and decoupling techniques are

highlighted in the TPA3221 device EVM User's Guide SLVUAG8 (as well as the Application Information section

and Layout Examples section) and must be followed as closely as possible for proper operation and

performance. Due the high-voltage switching of the output stage, it is particularly important to properly decouple

the output power stages in the manner described in the TPA3221 device EVM User's Guide SLVUAG8. The lack

of proper decoupling, like that shown in the EVM User's Guide, can results in voltage spikes which can damage

the device, or cause poor audio performance and device shutdown faults.