參數(shù)資料
型號(hào)： TPA3100D2RGZR-P
廠商： Texas Instruments, Inc.
英文描述： 20-W STEREO CLASS-D AUDIO POWER AMPLIFIER
中文描述： 20 W立體聲D類音頻功率放大器
文件頁數(shù)： 29/38頁
文件大小： 3258K
代理商： TPA3100D2RGZR-P
www.ti.com
C
IN
AudioPower
Amplifier
Generator
Low-Pass
RCFilter
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
RCFilter
R
L
C
ANA
Twisted-PairWire
EvaluationModule
Twisted-PairWire
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).
TPA3100D2
SLOS469D–OCTOBER 2005–REVISED FEBRUARY 2006
Figure 35. 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 2
).
Table 2
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 2. 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
The component values of the RC filter are selected using the equivalent output circuit as shown in
Figure 36
. R
L
is the load impedance that the APA is driving for the test. The analyzer input impedance specifications should be
available and substituted for R
ANA
and C
ANA
. The filter components, R
FILT
and C
FILT
, 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.
29
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參數(shù)描述
TPA3100D2RGZT 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
TPA3100D2RGZT 制造商:Texas Instruments 功能描述:IC AMP AUDIO PWR 21.8W D 48VQFN
TPA3100D2RGZTG4 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
TPA3101D2 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
TPA3101D2_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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