INP

INN

SD

SD

Fault

Fault

PLIMIT

PLIMIT

PVCC

8to26V

1uF

OUTN

FERRITE

BEAD

FILTER

OUTP

25W

8Ω

OUTN

FERRITE

BEAD

FILTER

FERRITE

BEAD

FILTER

OUTP

8Ω

OUT+

-

OUT

Audio

Source

TPA3112D1

GAIN0

GAIN0

GAIN1

GAIN1

TPA3112D1

www.ti.com

SLOS654C – SEPTEMBER 2009 – REVISED JULY 2012

25-W FILTER-FREE MONO CLASS-D AUDIO POWER AMPLIFIER with SPEAKER GUARD™

Check for Samples: TPA3112D1

1

FEATURES

DESCRIPTION

2

•

25-W into an 8-

Ω Load at < 0.1% THD+N From

The TPA3112D1 is a 25-W efficient, Class-D audio

a 24-V Supply

power amplifier for driving a bridge tied speaker.

•

20-W into an 4-

Ω Load at 10% THD+N From a

Advanced EMI Suppression Technology enables the

12-V Supply

use of inexpensive ferrite bead filters at the outputs

•

94% Efficient Class-D Operation into 8-

Ω Load

while meeting EMC requirements. SpeakerGuard™

speaker protection system includes an adjustable

Eliminates Need for Heat Sinks

power limiter and a DC detection circuit. The

•

Wide Supply Voltage Range Allows Operation

adjustable power limiter allows the user to set a

from 8 to 26 V

"virtual" voltage rail lower than the chip supply to limit

•

Filter-Free Operation

the amount of current through the speaker. The DC

detect circuit measures the frequency and amplitude

•

SpeakerGuard™ Speaker Protection Includes

of the PWM signal and shuts off the output stage if

Adjustable Power Limiter plus DC Protection

the input capacitors are damaged or shorts exist on

•

Flow Through Pin Out Facilitates Easy Board

the inputs.

Layout

The TPA3112D1 can drive a mono speaker as low as

•

Robust Pin-to-Pin Short Circuit Protection and

4

Ω. The high efficiency of the TPA3112D1, > 90%,

Thermal Protection with Auto-Recovery Option

eliminates the need for an external heat sink when

•

Excellent THD+N/ Pop Free Performance

playing music.

•

Four Selectable, Fixed Gain Settings

The outputs are fully protected against shorts to

•

Differential Inputs

protection and thermal protection includes an auto-

APPLICATIONS

recovery feature.

•

Televisions

•

Consumer Audio Equipment

Figure 1. Simplified Application Diagram

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

SpeakerGuard, PowerPad are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2012, 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.