TPA3112D1_10 Datasheet, PDF (1/27 Pages) Texas Instruments – 25-W FILTER-FREE MONO CLASS-D AUDIO POWER AMPLIFIER with SPEAKER GUARD™

TPA3112D1
www.ti.com
SLOS654A – SEPTEMBER 2009 – REVISED JULY 2010
25-W FILTER-FREE MONO CLASS-D AUDIO POWER AMPLIFIER with SPEAKER GUARD™
Check for Samples: TPA3112D1
FEATURES
1
•2 25-W into an 8-Ω Load at < 0.1% THD+N From
a 24V 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
APPLICATIONS
• Televisions
• Consumer Audio Equipment
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, V_CC, and output-to-output. The short-circuit
protection and thermal protection includes an
auto-recovery feature.
Audio
Source
OUT+
OUT -
1uF
INP
INN
TPA3112D1
GAIN0
GAIN1
PLIMIT
OUTP
OUTN
FERRITE
BEAD
FILTER
25W
8Ω
Fault
SD
PVCC
Figure 1. Simplified Application Diagram
8 to 26V
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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.
SpeakerGuard is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2010, Texas Instruments Incorporated