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| 型號(hào)： | TPA3107D2_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 15 W立體聲D類音頻功率放大器 |
| 文件頁(yè)數(shù)： | 25/36頁(yè) |
| 文件大?。?/td> | 510K |
| 代理商： | TPA3107D2_07 |
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R
FILT
R
L
R
FILT
C
FILT
V
L
= V
IN
V
OUT
R
ANA
C
ANA
R
ANA
C
ANA
C
FILT
To APA
GND
AP Analyzer Input
RC Low-Pass Filters
Load
V
OUT
w
w
O
V
IN
R
ANA
+
R
FILT
R
ANA
1 + j
(
(
(
)
)
)
=
(5)
f =
2 x f
max
(6)
C
=
FILT
1
2
x f
x R
p
c
FILT
(7)
TPA3107D2
SLOS509A–OCTOBER 2006–REVISED NOVEMBER 2006
Figure 30. Measurement Low-Pass Filter Derivation Circuit-Class-D APAs
The transfer function for this circuit is shown in
Equation 5
where
ω
O
= R
EQ
C
EQ
, R
EQ
= R
FILT
|| R
ANA
and
C
EQ
= (C
FILT
+ C
ANA
). The filter frequency should be set above f
MAX
, the highest frequency of the measurement
bandwidth, to avoid attenuating the audio signal.
Equation 6
provides this cutoff frequency, f
C
. The value of R
FILT
must be chosen large enough to minimize current that is shunted from the load, yet small enough to minimize
the attenuation of the analyzer-input voltage through the voltage divider formed by R
FILT
and R
ANA
. A general
rule is that R
FILT
should be small (~100
) for most measurements. This reduces the measurement error to less
than 1% for R
ANA
≥
10 k
.
An exception occurs with the efficiency measurements, where R
must be increased by a factor of ten to
reduce the current shunted through the filter. C
FILT
must be decreased by a factor of ten to maintain the same
cutoff frequency. See
Table 3
for the recommended filter component values.
Once f
is determined and R
is selected, the filter capacitance is calculated using . When the calculated
value is not available, it is better to choose a smaller capacitance value to keep f
C
above the minimum desired
value calculated in
Equation 7
.
Table 3
shows recommended values of R
FILT
and C
FILT
based on common component values. The value of f
C
was originally calculated to be 28 kHz for an f
MAX
of 20 kHz. C
FILT
, however, was calculated to be 57,000 pF, but
the nearest values of 56,000 pF and 51,000 pF were not available. A 47,000-pF capacitor was used instead,
and f
C
is 34 kHz, which is above the desired value of 28 kHz.
Table 3. Typical RC Measurement Filter Values
MEASUREMENT
Efficiency
All other measurements
R
FILT
1000
100
C
FILT
5,600 pF
56,000 pF
25
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|---|---|
| TPA3107D2EVM | 功能描述:音頻 IC 開(kāi)發(fā)工具 AUD POWER AMP RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA3107D2PAP | 功能描述:音頻放大器 15W Stereo Class-D Aud Power 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 |
| TPA3107D2PAPG4 | 功能描述:音頻放大器 15W Stereo Class-D Aud Power 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 |
| TPA3107D2PAPR | 功能描述:音頻放大器 15W Stereo Class-D Audio Power 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 |
| TPA3107D2PAPRG4 | 功能描述:音頻放大器 15W Stereo Class-D Audio Power 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 |
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