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參數(shù)資料
| 型號： | TPA3003D2PFBR |
| 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, TQFP-48 |
| 文件頁數(shù)： | 24/36頁 |
| 文件大?。?/td> | 755K |
| 代理商： | TPA3003D2PFBR |
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TPA3003D2
SLOS406A FEBRUARY 2003 REVISED MARCH 2003
30
www.ti.com
APPLICATION INFORMATION
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 3 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 3 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 3. 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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