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參數(shù)資料
| 型號： | 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)： | 30/38頁 |
| 文件大?。?/td> | 3258K |
| 代理商： | TPA3100D2RGZR-P |
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R
FIL
T
R
L
R
FIL
T
C
FIL
T
V
L
=V
IN
V
OUT
R
ANA
C
ANA
R
ANA
C
ANA
C
FIL
T
T
o
AP
A
GND
AP AnalyzerInput
RCLow-PassFilters
Load
V
OUT
w
V
IN
w
O
R
ANA
+
R
FILT
R
ANA
1+j
(
(
(
)
)
)
=
(5)
f =
c
2
x
f
max
(6)
C
=
FILT
1
2
xf
xR
p
c
FILT
(7)
TPA3100D2
SLOS469D–OCTOBER 2005–REVISED FEBRUARY 2006
Figure 36. 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
FILT
must be increased by a factor of ten to
reduce the current shunted through the filter. C
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
C
is determined and R
FILT
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
30
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| 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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