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參數(shù)資料
| 型號： | TPA2012D2RTJTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 785K |
| 代理商： | TPA2012D2RTJTG4 |
Decoupling Capacitor (CS)
Input Capacitors (CI)
fc +
1
2p R
ICI
(1)
C
I +
1
2p R
I f
c
(2)
SLOS438D – DECEMBER 2004 – REVISED JUNE 2008 .................................................................................................................................................. www.ti.com
The TPA2012D2 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling
to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
spikes, or digital hash on the line a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1
F, placed as close as possible to the device PV
DD lead works best. Placing this decoupling capacitor close to
the TPA2012D2 is important for the efficiency of the Class-D amplifier, because any resistance or inductance in
the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise
signals, a 4.7
F or greater capacitor placed near the audio power amplifier would also help, but it is not required
in most applications because of the high PSRR of this device.
Table 1. Gain Setting
INPUT IMPEDANCE
GAIN
G1
G0
(RI)
(V/V)
(dB)
(k
)
0
2
6
28.1
0
1
4
12
17.3
1
0
8
18
9.8
1
16
24
5.2
The TPA2012D2 does not require input coupling capacitors if the design uses a differential source that is biased
from 0.5 V to VDD – 0.8 V. If the input signal is not biased within the recommended common-mode input range, if
high pass filtering is needed (see Figure 34), or if using a single-ended source (see Figure 35), input coupling
capacitors are required.
The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in
The value of the input capacitor is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the
corner frequency can be set to block low frequencies in this application. Not using input capacitors can increase
output offset.
Equation 2 is used to solve for the input coupling capacitance.
If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.
12
Copyright 2004–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2012D2
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| TPA2012D2RTJT | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
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相關代理商/技術參數(shù) |
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| TPA2012D2YZH | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.1 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| TPA2012D2YZHR | 功能描述:音頻放大器 2.1W Stereo Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2012D2YZHT | 功能描述:音頻放大器 2.1W Stereo Class-D Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2013D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.7-W CONSTANT OUTPUT POWER CLASS-D AUDIO AMPLIFIER WITH INTEGRATED BOOST CONVERTER |
| TPA2013D1_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.7-W CONSTANT OUTPUT POWER CLASS-D AUDIO AMPLIFIER WITH INTEGRATED BOOST CONVERTER |
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