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参数资料
| 型号： | TPA2031D1YZFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.5 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA9 |
| 封装： | 1.45 X1.45 MM, LEAD FREE, WCSP-9 |
| 文件页数： | 3/24页 |
| 文件大小： | 754K |
| 代理商： | TPA2031D1YZFR |
Decoupling Capacitor (CS)
Input Capacitors (CI)
C
I
1
f =
(2
R
C )
p
(2)
I
C
1
C =
(2
R
f )
p
(3)
_
+
IN-
IN+
PWM
H-
Bridge
VO+
VO-
Internal
Oscillator
CS
ToBattery
VDD
GND
Bias
Circuitry
RI
+
-
Differential
Input
Filter-FreeClassD
SHUTDOWN
TPA2031D1
www.ti.com........................................................................................................................................................................................................ SLOS546 – MAY 2008
For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the TPA2031D1 to operate
at its best, and keeps a high voltage at the input making the inputs less susceptible to noise.
The TPA2031D1 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 V
DD lead works best. Placing this decoupling capacitor close to the
TPA2031D1 is very 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 10
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.
The TPA2031D1 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 (shown in Figure 28). If the input signal is not biased within the recommended
common-mode input range, if needing to use the input as a high pass filter (shown in Figure 29), or if using a
single-ended source (shown in Figure 30), 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.
Equation 3 is reconfigured 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.
For a flat low-frequency response, use large input coupling capacitors (1
F). However, in a GSM phone the
ground signal is fluctuating at 217 Hz, but the signal from the codec does not have the same 217 Hz fluctuation.
The difference between the two signals is amplified, sent to the speaker, and heard as a 217 Hz hum.
Figure 28. Typical TPA2031D1 Application Schematic With Differential Input for a Wireless Phone
Copyright 2008, Texas Instruments Incorporated
11
Product Folder Link(s): TPA2031D1
相关PDF资料 |
PDF描述 |
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| TPA2032D1YZFR | 2.75 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
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| TPA2034D1YZFR | 2.75 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA2031D1YZFT | 功能描述:音频放大器 2.5W Mono Class-D Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2032D1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2.75-W FIXED GAIN MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| TPA2032D1YZF | 制造商:TI 制造商全称:Texas Instruments 功能描述:2.75-W FIXED GAIN MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| TPA2032D1YZFR | 功能描述:音频放大器 2.75W Mon Fully Diff Class-D Aud Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2032D1YZFT | 功能描述:音频放大器 2.75W Mon Fully Diff Class-D Aud Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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