參數(shù)資料
型號(hào)： TPA3100D2IRGZRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
封裝： 7 X 7 MM, GREEN, PLASTIC, QFN-48
文件頁(yè)數(shù)： 17/37頁(yè)
文件大小： 1024K
代理商： TPA3100D2IRGZRQ1
VBYP Capacitor Selection
ROSC Resistor Selection
F
=
OSC
1
2xROSCxCOSC
(4)
Differential Input
SHUTDOWN Operation
MUTE Operation
TPA3100D2-Q1
SLOS557 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
The internal bias generator (VBYP) nominally provides a 1.25-V internal bias for the preamplifier stages. The
external input capacitors and this internal reference allow the inputs to be biased within the optimal
common-mode range of the input preamplifiers.
The selection of the capacitor value on the VBYP terminal is critical for achieving the best device performance.
During power up or recovery from the shutdown state, the VBYP capacitor determines the rate at which the
amplifier starts up. When the voltage on the VBYP capacitor equals VBYP, the device starts a 16.4-ms timer.
When this timer completes, the outputs start switching. The charge rate of the capacitor is calculated using the
standard charging formula for a capacitor, I = C × dV/dT. The charge current is nominally equal to 250 A and
dV is equal to VBYP. For example, a 1-F capacitor on VBYP would take 5 ms to reach the value of VBYP and
begin a 16.4-ms count before the outputs turn on. This equates to a turn-on time of <30 ms for a 1-F capacitor
on the VBYP terminal.
A secondary function of the VBYP capacitor is to filter high-frequency noise on the internal 1.25-V bias generator.
A value of at least 0.47 F is recommended for the VBYP capacitor. For the best power-up and shutdown pop
performance, the VBYP capacitor should be greater than or equal to the input capacitors.
The resistor connected to the ROSC terminal controls the class-D output switching frequency using Equation 4:
COSC is an internal capacitor that is nominally equal to 20 pF. Variation over process and temperature can
result in a ±15% change in this capacitor value.
For example, if ROSC is fixed at 100 k
, the frequency from device to device with this fixed resistance could
vary from 217 kHz to 294 kHz with a 15% variation in the internal COSC capacitor. The tolerance of the ROSC
resistor should also be considered to determine the range of expected switching frequencies from device to
device. It is recommended that 1% tolerance resistors be used.
The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To
use the TPA3100D2 with a differential source, connect the positive lead of the audio source to the INP input and
the negative lead from the audio source to the INN input. To use the TPA3100D2 with a single-ended source, ac
ground the INP or INN input through a capacitor equal in value to the input capacitor on INN or INP and apply
the audio source to either input. In a single-ended input application, the unused input should be ac grounded at
the audio source instead of at the device input for best noise performance.
The TPA3100D2 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-off pop performance, place the amplifier in the shutdown or mute mode prior to removing the
power supply voltage.
The MUTE pin is an input for controlling the output state of the TPA3100D2. A logic high on this terminal
disables the outputs. A logic low on MUTE 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.
24
Copyright 2008, Texas Instruments Incorporated
相關(guān)PDF資料
PDF描述
TPA3100D2RGZR-P 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2RGZR 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2RGZT 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2PHPR 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
TPA3100D2RGZRG4 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA3100D2PHP 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2PHPG4 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2PHPR 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2PHPRG4 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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