TPA6047A4
www.ti.com.............................................................................................................................................................................................. SLOS601–OCTOBER 2008
2-W STEREO AUDIO POWER AMPLIFIER
WITH DirectPath™ STEREO HEADPHONE DRIVE AND REGULATOR
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FEATURES
DESCRIPTION
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•
Microsoft™ Windows Vista™ Compliant
•
Fully Differential Architecture and High PSRR
Provide Excellent RF Rectification Immunity
The TPA6047A4 is a stereo audio power amplifier
and DirectPath™ headphone amplifier in a thermally
enhanced, space-saving, 32-pin QFN package. The
speaker amplifier is capable of driving 2.1 W per
channel continuously into 4-Ω loads at 5 V. The
headphone amplifier achieves a minimum of 100 mW
at 10% THD+N from a 5-V supply. A built-in internal
4-step gain control for the speaker amplifier and a
fixed –1.5 V/V gain for the headphone amplifier
minimizes external components needed.
•
2.1-W, 1% THD+N Into 4-Ω Speakers and
100-mW, 10% THD+N Into 16-Ω Headphones
From 5-V Supply
•
•
DirectPath™ Headphone Amplifier Eliminates
(1)
Output Capacitors
Internal 4-Step Speaker Gain Control: 10, 12,
15.6, 21.6 dB and Fixed –1.5-V/V Headphone
Independent shutdown control and dedicated inputs
for the speaker and headphone allow the TPA6047A4
to simultaneously drive both headphones and internal
speakers. Differential inputs to the speaker amplifiers
offer superior power-supply and common-mode noise
rejection.
•
•
4.75-V Low Dropout Regulator for CODEC
Independent Shutdown Controls for Speaker,
Headphone Amplifier, and Low Dropout
Regulator (LDO)
•
Output Short-Circuit and Thermal Protection
APPLICATIONS
•
Notebook Computers
•
Portable DVD
SIMPLIFIED APPLICATION CIRCUIT
TPA6047A4
TPA6040A4
Active Low
4.75
TPA6041A4
Active Low
3.3
TPA6047A4
Active High
4.75
CODEC
ROUT+
ROUT–
Speaker
Enable
SPKR_RIN+
SPKR_RIN–
SPKR
HPR
LOUT+
LOUT–
LDO (V)
HPL
SPKR_LIN+
SPKR_LIN–
SPKL
6, 10, 15.6,
21.6
10, 12, 15.6,
21.6
10, 12, 15.6,
21.6
VDD
Gain (dB)
SPVDD
SPGND
4.5 V – 5.5 V
BYPASS
GAIN0
GAIN1
Gain
Control
HP_EN
Shutdown
Control
SPKR_EN
OUTL
OUTR
HP_INR
SGND
HPVSS
CPVSS
HP_INL
HPVDD
CPVDD
VDD
3 V – 5.5 V
CPGND
C1P
C1N
4.5 V – 5.5 V
Regulator Enable
REG_EN
REG_OUT
4.75 V (To CODEC)
(1) US Patent Number 5289137
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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.
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DirectPath, PowerPAD are trademarks of Texas Instruments.
Microsoft, Windows Vista are trademarks of Microsoft Corporation.
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 © 2008, Texas Instruments Incorporated