TPA3112D1PWPRG4.A中文资料德州仪器数据手册PDF规格书

1 Features

1• 25-W into an 8-Ω Load at < 0.1% THD+N From a

24-V Supply

• 20-W into an 4-Ω Load at 10% THD+N From a

12-V Supply

• 94% Efficient Class-D Operation into 8-Ω Load

Eliminates Need for Heat Sinks

• Wide Supply Voltage Range Allows Operation

from 8 to 26 V

• Filter-Free Operation

• SpeakerGuard™ Speaker Protection Includes

Adjustable Power Limiter plus DC Protection

• Flow Through Pin Out Facilitates Easy Board

Layout

• Robust Pin-to-Pin Short Circuit Protection and

Thermal Protection with Auto-Recovery Option

• Excellent THD+N/ Pop Free Performance

• Four Selectable, Fixed Gain Settings

• Differential Inputs

2 Applications

• Televisions

• Consumer Audio Equipment

3 Description

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

power amplifier for driving a bridge tied speaker.

Advanced EMI Suppression Technology enables the

use of inexpensive ferrite bead filters at the outputs

while meeting EMC requirements. SpeakerGuard

speaker protection system includes an adjustable

power limiter and a DC detection circuit. The

adjustable power limiter allows the user to set a

virtual voltage rail lower than the chip supply to limit

the amount of current through the speaker. The DC

detect circuit measures the frequency and amplitude

of the PWM signal and shuts off the output stage if

the input capacitors are damaged or shorts exist on

the inputs.

The TPA3112D1 can drive a mono speaker as low as

4Ω. The high efficiency of the TPA3112D1, > 90%,

eliminates the need for an external heat sink when

playing music.

The outputs are fully protected against shorts to

GND, VCC, and output-to-output. The short-circuit

protection and thermal protection includes an autorecovery

feature.