1 F

m

SD

MuteControl

PVCCL

TPA3121D2

SIMPLIFIED APPLICATIONCIRCUIT

PVCCR

VCLAMP

GAIN1

BYPASS

1 F

m

1 F

m

0.22 F

m

AGND

LeftChannel

RightChannel

10Vto26V

10Vto26V

4-StepGainControl

ShutdownControl

LIN

RIN

BSR

BSL

PGNDR

PGNDL

0.22 F

m

33 H

m

33 H

m

0.22 F

m

470 F

m

0.22 F

m

1 F

m

470 F

m

GAIN0

AVCC

MUTE

ROUT

LOUT

S0267-01

TPA3121D2

www.ti.com

SLOS537B – MAY 2008 – REVISED JANUARY 2014

15-W STEREO CLASS-D AUDIO POWER AMPLIFIER

Check for Samples: TPA3121D2

1

FEATURES

APPLICATIONS

23

•

10-W/Ch Stereo Into an 8-

Ω Load From a 24-V

•

Flat Panel Display TVs

Supply

•

DLP® TVs

•

15-W/Ch Stereo Into a 4-

Ω Load from a 22-V

•

CRT TVs

Supply

•

Powered Speakers

•

30-W/Ch Mono Into an 8-

Ω Load from a 22-V

Supply

DESCRIPTION

•

Operates From 10 V to 26 V

The TPA3121D2 is a 15-W (per channel), efficient,

class-D audio power amplifier for driving stereo

•

Can Run From +24 V LCD Backlight Supply

speakers in a single-ended configuration or a mono

•

Efficient Class-D Operation Eliminates Need

speaker in a bridge-tied-load configuration. The

for Heat Sinks

TPA3121D2 can drive stereo speakers as low as 4

Ω.

•

Four Selectable, Fixed-Gain Settings

The efficiency of the TPA3121D2 eliminates the need

for an external heat sink when playing music.

•

Internal Oscillator to Set Class D Frequency

(No External Components Required)

The gain of the amplifier is controlled by two gain

select pins. The gain selections are 20, 26, 32, and

•

Single-Ended Analog Inputs

36 dB.

•

Thermal and Short-Circuit Protection With

Auto Recovery

The patented start-up and shutdown sequences

minimize pop noise in the speakers without additional

•

Space-Saving Surface Mount 24-Pin TSSOP

circuitry.

Package

•

Advanced Power-Off Pop Reduction

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

DLP is a registered trademark of Texas Instruments.

3

System Two, Audio Precision are trademarks of Audio Precision, Inc.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2014, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.