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TPA0242PWP Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte TPA0242PWP
Spiegazioni elettronici  STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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TPA0242PWP Scheda tecnica(HTML) 1 Page - Texas Instruments

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TPA0242
STEREO 2-W AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL AND MUX CONTROL
SLOS287 – NOVEMBER 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Compatible With PC 99 Desktop Line-Out
Into 10-k
Ω Load
D Compatible With PC 99 Portable Into 8-Ω
Load
D Internal Gain Control, Which Eliminates
External Gain-Setting Resistors
D DC Volume Control From 20 dB to –40 dB
D 2-W/Ch Output Power Into 3-Ω Load
D Input MUX Select Terminal
D PC-Beep Input
D Depop Circuitry
D Stereo Input MUX
D Fully Differential Input
D Low Supply Current and Shutdown Current
D Surface-Mount Power Packaging
24-Pin TSSOP PowerPAD
description
The TPA0242 is a stereo audio power amplifier in a 24-pin TSSOP thermally enhanced package capable of
delivering 2 W of continuous RMS power per channel into 3-
Ω loads. This device minimizes the number of
external components needed, which simplifies the design and frees up board space for other features. When
driving 1 W into 8-
Ω speakers, the TPA0242 has less than 0.22% THD+N across its specified frequency range.
Included within this device is integrated depop circuitry that virtually eliminates transients that cause noise in
the speakers.
Amplifier gain is controlled by a dc voltage input on the VOLUME terminal. There are 31 discrete steps covering
the range of 20 dB (maximum volume setting) to –40 dB (minimum volume setting) in 2 dB steps. When the
VOLUME terminal exceeds 3.54 V, the device is muted. An internal input MUX allows two sets of stereo inputs
to the amplifier. The HP/LINE terminal allows the user to select which MUX input is active regardless of whether
the amplifier is in SE or BTL mode. In notebook applications, where internal speakers are driven as BTL and
the line outputs (often headphone drive) are required to be SE, the TPA0242 automatically switches into SE
mode when the SE/BTL input is activated, and this effectively reduces the gain by 6 dB.
The TPA0242 consumes only 20 mA of supply current during normal operation. A miserly shutdown mode
reduces the supply current to less than 150
µA.
The PowerPAD package (PWP) delivers a level of thermal performance that was previously achievable only
in TO-220-type packages. Thermal impedances of approximately 35
°C/W are truly realized in multilayer PCB
applications. This allows the TPA0242 to operate at full power into 8-
Ω loads at ambient temperatures of 85°C.
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.
Copyright
© 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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24
23
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13
GND
HP/LINE
VOLUME
LOUT+
LLINEIN
LHPIN
PVDD
RIN
LOUT–
LIN
BYPASS
GND
GND
RLINEIN
SHUTDOWN
ROUT+
RHPIN
VDD
PVDD
CLK
ROUT–
SE/BTL
PC-BEEP
GND
PWP PACKAGE
(TOP VIEW)
PowerPAD is a trademark of Texas Instruments Incorporated.


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