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參數資料
| 型號： | TPA3002D2PHP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數： | 26/40頁 |
| 文件大小： | 735K |
| 代理商： | TPA3002D2PHP |
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TPA3002D2
SLOS402C DECEMBER 2002 REVISED JANUARY 2004
www.ti.com
32
C
IN
Audio Power
Amplifier
Generator
Low-Pass
RC Filter
C
IN
R
GEN
R
GEN
R
IN
R
IN
V
GEN
R
OUT
R
OUT
Analyzer
R
ANA
R
ANA
C
ANA
Low-Pass
RC Filter
R
L
C
ANA
Twisted-Pair Wire
Evaluation Module
Twisted-Pair Wire
Figure 41. Differential Input—BTL output Measurement Circuit
The generator should have balanced outputs and the signal should be balanced for best results. An unbalanced
output can be used, but it may create a ground loop that will affect the measurement accuracy. The analyzer
must also have balanced inputs for the system to be fully balanced, thereby cancelling out any common mode
noise in the circuit and providing the most accurate measurement.
The following general rules should be followed when connecting to APAs with differential inputs and BTL
outputs:
D Use a balanced source to supply the input signal.
D Use an analyzer with balanced inputs.
D Use twisted-pair wire for all connections.
D Use shielding when the system environment is noisy.
D Ensure the cables from the power supply to the APA, and from the APA to the load, can handle the large
currents (see Table 3).
Table 3 shows the recommended wire size for the power supply and load cables of the APA system. The real
concern is the dc or ac power loss that occurs as the current flows through the cable. These recommendations
are based on 12-inch long wire with a 20-kHz sine-wave signal at 25
°C.
Table 3. Recommended Minimum Wire Size for Power Cables
POUT
(W)
RL
(
)
AWG SIZE
DC POWER LOSS
(MW)
AC POWER LOSS
(MW)
10
4
18
22
16
40
18
42
2
4
18
22
3.2
8.0
3.7
8.5
1
8
22
28
2.0
8.0
2.1
8.1
< 0.75
8
22
28
1.5
6.1
1.6
6.2
CLASS-D RC LOW-PASS FILTER
An RC filter is used to reduce the square-wave output when the analyzer inputs cannot process the pulse-width
modulated class-D output waveform. This filter has little effect on the measurement accuracy because the cutoff
frequency is set above the audio band. The high frequency of the square wave has negligible impact on
measurement accuracy because it is well above the audible frequency range and the speaker cone cannot
respond at such a fast rate. The RC filter is not required when an LC low-pass filter is used, such as with the
class-D APAs that employ the traditional modulation scheme (TPA032D0x, TPA005Dxx).
The component values of the RC filter are selected using the equivalent output circuit as shown in Figure 42.
RL is the load impedance that the APA is driving for the test. The analyzer input impedance specifications should
be available and substituted for RANA and CANA. The filter components, RFILT and CFILT, can then be derived
for the system. The filter should be grounded to the APA near the output ground pins or at the power supply
ground pin to minimize ground loops.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA3002D2PHPG4 | 功能描述:音頻放大器 Stereo Med Pwr Filter-Free Class-D 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 |
| TPA3002D2PHPR | 功能描述:音頻放大器 Stereo Med Pwr Filter-Free Class-D 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 |
| TPA3002D2PHPRG4 | 功能描述:音頻放大器 Stereo Med Pwr Filter-Free Class-D 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 |
| TPA3003D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-Q STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL |
| TPA3003D2_06 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-Q STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL |
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