參數(shù)資料
型號(hào)： TPA3120D2_07
廠商： Texas Instruments, Inc.
英文描述： 25-W STEREO CLASS-D AUDIO POWER AMPLIFIER
中文描述： 25 W立體聲D類音頻功率放大器
文件頁(yè)數(shù)： 16/27頁(yè)
文件大?。?/td> 631K
代理商： TPA3120D2_07
www.ti.com
VCLAMP Capacitor
To ensure that the maximum gate-to-source voltage for the NMOS output transistors is not exceeded, one
internal regulator clamps the gate voltage. One 1-
μ
F capacitor must be connected from VCLAMP (pin 11) to
ground and must be rated for at least 16 V. The voltages at the VCLAMP terminal may vary with V
CC
and may
not be used for powering any other circuitry.
VBYP Capacitor Selection
The scaled supply reference (VBYP) nominally provides an AVCC/8 internal bias for the preamplifier stages. The
external capacitor for this reference (C
) is a critical component and serves several important functions. During
start-up or recovery from shutdown mode, C
BYP
determines the rate at which the amplifier starts. The start up
time is proportional to 0.5 sec per microfarad. Thus, the recommended 1
μ
F cap results in a start-up time of
approximately 500 msec. The second function is to reduce noise produced by the power supply caused by
coupling with the output drive signal. This noise could result in degraded power supply rejection and THD + N.
The circuit is designed for a C
BYP
value of 1
μ
F for best pop performance. The inputs caps should be the same
value. A ceramic or tantalum low-ESR capacitor is recommended.
SHUTDOWN OPERATION
The TPA3120D2 employs a shutdown mode of operation designed to reduce supply current (I
CC
) to the absolute
minimum level during periods of nonuse for power conservation. The SHUTDOWN input terminal should be held
high (see specification table for trip point) during normal operation when the amplifier is in use. Pulling
SHUTDOWN low causes the outputs to mute and the amplifier to enter a low-current state. Never leave
SHUTDOWN unconnected, because amplifier operation would be unpredictable.
MUTE Operation
The MUTE pin is an input for controlling the output state of the TPA3120D2. A logic high on this terminal causes
the outputs to run at a constant 50% duty cycle. A logic low on this pin enables the outputs. This terminal may
be used as a quick disable/enable of outputs when changing channels on a television or transitioning between
different audio sources.
USING LOW-ESR CAPACITORS
Low-ESR capacitors are recommended throughout this application section. A real (as opposed to ideal)
capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this
resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this
resistance, the more the real capacitor behaves like an ideal capacitor.
SHORT-CIRCUIT PROTECTION
The TPA3120D2 has short-circuit protection circuitry on the outputs that prevents damage to the device during
output-to-output shorts and output-to-GND shorts after the filter and output capacitor (at the speaker terminal.)
Directly at the device terminals, the protection circuitry prevents damage to device during output-to-output,
output-to-ground, and output-to-supply. When a short circuit is detected on the outputs, the part immediately
disables the output drive. This is an unlatched fault. Normal operation is restored when the fault is removed.
TPA3120D2
SLOS507C–MARCH 2007–REVISED MAY 2007
For the best power-up
pop
performance, place the amplifier in the shutdown or mute mode prior to applying the
power supply voltage.
The MUTE terminal should never be left floating. For power conservation, the SHUTDOWN terminal should be
used to reduce the quiescent current to the absolute minimum level.
16
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TPA3120D2EVM 功能描述:音頻 IC 開發(fā)工具 TPA3120D2 Evaluation Module RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TPA3120D2PWP 功能描述:音頻放大器 25-W Stereo Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA3120D2PWP 制造商:Texas Instruments 功能描述:Audio Power Amplifiers
TPA3120D2PWPG4 功能描述:音頻放大器 25W Stereo Class D Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA3120D2PWPR 功能描述:音頻放大器 25-W Stereo Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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