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參數(shù)資料
| 型號： | TPA3121D2PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PDSO24 |
| 封裝： | PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 9/30頁 |
| 文件大?。?/td> | 749K |
| 代理商： | TPA3121D2PWP |
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SLOS537A – MAY 2008 – REVISED AUGUST 2010
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-mF 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 VCC 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 (CBYP) is a critical component and serves several important functions. During
start-up or recovery from shutdown mode, CBYP determines the rate at which the amplifier starts. The start up
time is proportional to 0.5 s per microfarad. Thus, the recommended 1-mF capacitor results in a start-up time of
approximately 500 ms. 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 CBYP value of 1 mF for best pop performance. The input capacitors should have the
same value. A ceramic or tantalum low-ESR capacitor is recommended.
SHUTDOWN OPERATION
The TPA3121D2 employs a shutdown mode of operation designed to reduce supply current (ICC) 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.
For the best power-up pop performance, place the amplifier in the shutdown or mute mode prior to applying the
power-supply voltage.
MUTE Operation
The MUTE pin is an input for controlling the output state of the TPA3121D2. 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.
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.
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 TPA3121D2 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.
Copyright 2008–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPA3121D2
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PDF描述 |
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| TPA3121D2PWPR | AUDIO AMPLIFIER, PDSO24 |
| TPA3122D2N | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20 |
| TPA3123D2PWPG4 | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA3123D2PWPRG4 | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA3123D2PWPR | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA3121D2PWPG4 | 功能描述:音頻放大器 15W 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 |
| TPA3121D2PWPR | 功能描述:音頻放大器 15W 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 |
| TPA3121D2PWPRG4 | 功能描述:音頻放大器 15W 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 |
| TPA3122D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3122D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA3122D2EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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