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| 型號： | TPA3120D2_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 25-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 25 W立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 22/27頁 |
| 文件大?。?/td> | 631K |
| 代理商： | TPA3120D2_07 |
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DIFFERENTIAL INPUT AND BTL OUTPUT (TPA3120D2 Mono Configuration)
Many of the class-D APAs and many class-AB APAs have differential inputs and bridge-tied load (BTL) outputs.
Differential inputs have two input pins per channel and amplify the difference in voltage between the pins.
Differential inputs reduce the common-mode noise and distortion of the input circuit. BTL is a term commonly
used in audio to describe differential outputs. BTL outputs have two output pins providing voltages that are 180
°
out of phase. The load is connected between these pins. This has the added benefits of quadrupling the output
power to the load and eliminating a dc blocking capacitor.
C
IN
Audio Power
Amplifier
Generator
C
IN
R
GEN
R
GEN
R
IN
R
IN
V
GEN
Analyzer
R
ANA
R
ANA
C
ANA
R
L
C
ANA
Twisted-Pair Wire
Evaluation Module
Twisted-Pair Wire
L
filt
L
filt
C
filt
C
filt
TPA3120D2
SLOS507C–MARCH 2007–REVISED MAY 2007
A block diagram of the measurement circuit is shown in
Figure 31
. The differential input is a balanced input,
meaning the positive (+) and negative (–) pins have the same impedance to ground. Similarly, the SE output
equates to a balanced output.
Figure 31. 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 affects 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:
Use a balanced source to supply the input signal.
Use an analyzer with balanced inputs.
Use twisted-pair wire for all connections.
Use shielding when the system environment is noisy.
Ensure that the cables from the power supply to the APA, and from the APA to the load, can handle the large
currents (see
Table 4
).
Table 4
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 4. Recommended Minimum Wire Size for Power Cables
DC POWER LOSS
(MW)
16
3.2
2
1.5
AC POWER LOSS
(MW)
18
3.7
2.1
1.6
P
OUT
(W)
R
L
(
)
AWG Size
10
2
1
4
4
8
8
18
18
22
22
22
22
28
28
40
8
8
6.1
42
8.5
8.1
6.2
< 0.75
22
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| TPA3120D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA3120D2 Evaluation Module 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 |
| TPA3120D2PWP | 功能描述:音頻放大器 25-W Stereo Class-D 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 |
| TPA3120D2PWP | 制造商:Texas Instruments 功能描述:Audio Power Amplifiers |
| TPA3120D2PWPG4 | 功能描述:音頻放大器 25W 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 |
| TPA3120D2PWPR | 功能描述:音頻放大器 25-W Stereo Class-D 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 |
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