參數(shù)資料
型號(hào)： TPA3002D2PHP
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
封裝： GREEN, PLASTIC, HTQFP-48
文件頁(yè)數(shù)： 27/40頁(yè)
文件大?。?/td> 735K
代理商： TPA3002D2PHP
TPA3002D2
SLOS402C DECEMBER 2002 REVISED JANUARY 2004
www.ti.com
33
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
Figure 42. Measurement Low-Pass Filter Derivation Circuit—Class-D APAs
The transfer function for this circuit is shown in equation (10) where
ωO = REQCEQ, REQ = RFILTRANA 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.
V
OUT
V
IN
+
R
ANA
R
ANA)
R
FILT
1
) j w
w
O
f
C +
2
f
MAX
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 4 for the recommended filter component values.
Once fC is determined and RFILT is selected, the filter capacitance is calculated using equation (12). 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 (11).
C
FILT +
1
2
p
f
C
R
FILT
Table 4 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 4. Typical RC Measurement Filter Values
MEASUREMENT
RFILT
CFILT
Efficiency
1 000
5 600 pF
All other measurements
100
56 000 pF
(10)
(11)
(12)
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TPA3003D2_06 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:3-Q STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL
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