參數(shù)資料
型號： TPA3004D2PHPRG4
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(shù)： 32/46頁
文件大?。?/td> 838K
代理商： TPA3004D2PHPRG4
R
FILT
R
L
R
FILT
C
FILT
V
L= VIN
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
V
IN
+
R
ANA
R
ANA)
R
FILT
1 ) j
w
O
f
C +
2
f
MAX
C
FILT +
1
2p
f
C
R
FILT
SLOS407E – FEBRUARY 2003 – REVISED JANUARY 2011
www.ti.com
Figure 51. Measurement Low-Pass Filter Derivation Circuit—Class-D APAs
The transfer function for this circuit is shown in Equation 10 where wO = REQCEQ, REQ = RFILT||RANA and CEQ =
(CFILT + CANA). The filter frequency should be set above fMAX, the highest frequency of the measurement
bandwidth, to avoid attenuating the audio signal. Equation 11 provides this cutoff frequency, fC. The value of
RFILT 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 RFILT and RANA. A
rule of thumb is that RFILT should be small (~100 ) for most measurements. This reduces the measurement
error to less than 1% for RANA≥ 10 k.
(10)
(11)
An exception occurs with the efficiency measurements, where RFILT must be increased by a factor of ten to
reduce the current shunted through the filter. CFILT must be decreased by a factor of ten to maintain the same
cutoff frequency. See Table 2 for the recommended filter component values.
Once fC is determined and RFILT is selected, the filter capacitance is calculated using Equation 11. When the
calculated value is not available, it is better to choose a smaller capacitance value to keep fC above the minimum
desired value calculated in Equation 12.
(12)
Table 5 shows recommended values of RFILT and CFILT based on common component values. The value of fC
was originally calculated to be 28 kHz for an fMAX of 20 kHz. CFILT, however, was calculated to be 57000 pF, but
the nearest values of 56000 pF and 51000 pF were not available. A 47000 pF capacitor was used instead, and fC
is 34 kHz, which is above the desired value of 28 kHz.
Table 5. Typical RC Measurement Filter Values
MEASUREMENT
RFILT
CFILT
Efficiency
1000
5600 pF
All other measurements
100
56000 pF
38
Copyright 2003–2011, Texas Instruments Incorporated
Product Folder Link(s): TPA3004D2
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參數(shù)描述
TPA3005D2 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-W STEREO CLASS-D AUDIO POWER AMPLIFIER
TPA3005D2EVM 功能描述:音頻 IC 開發(fā)工具 TPA3005D2 Eval Mod 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
TPA3005D2PHP 功能描述:音頻放大器 Stereo Med Power Filter-Free 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
TPA3005D2PHPG4 功能描述:音頻放大器 Stereo Med Power Filter-Free 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
TPA3005D2PHPR 功能描述:音頻放大器 Stereo Med Power Filter-Free 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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