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TPA3220

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SLASEN3 – JANUARY 2018

Product Folder Links: TPA3220

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Copyright © 2018, Texas Instruments Incorporated

11 Power Supply Recommendations

11.1 Power Supplies

The TPA3220 device requires a single external power supply 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 TPA3220 device EVM User's Guide

(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 TPA3220 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 TPA3220 device. To simplify the

power supply requirements for the system, the TPA3220 device includes a integrated low-dropout (LDO) linear

regulator to create a 5V rail for AVDD and GVDD supplies. The linear regulator is internally connected to the

VDD supply and its output is present on the AVDD pin, providing a connection point for an external bypass

capacitors. It is important to note that the linear regulator integrated in the device has 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 TPA3220 device EVM User's Guide (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 TPA3220 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 TPA3220 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 TPA3220 device EVM User's Guide (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 TPA3220 device EVM User's Guide. 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.