參數(shù)資料
型號: TPA3001D1PWPG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 20 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO24
封裝: GREEN, PLASTIC, HTSSOP-24
文件頁數(shù): 13/28頁
文件大?。?/td> 504K
代理商: TPA3001D1PWPG4
Ci
IN
Zi
Zf
Input
Signal
f +
1
2p Z
iCi
fc +
1
2 p Z
i
C
i
3 dB
fc
C
i +
1
2p Z
i fc
SLOS398E – DECEMBER 2002 – REVISED AUGUST 2010
www.ti.com
Table 1. Gain Settings
AMPLIFIER GAIN
INPUT IMPEDANCE
(dB)
(k
)
GAIN1
GAIN0
TYP
0
12
241
0
1
18
168
1
0
23.6
104
1
36
33
INPUT RESISTANCE
Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest
value to over six times that value. As a result, if a single capacitor is used in the input high-pass filter, the –3-dB
or cutoff frequency also changes by over six times.
The –3-dB frequency can be calculated using Equation 5. Use Table 1 for ZI values.
(5)
INPUT CAPACITOR, CI
In the typical application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and the input impedance of the amplifier (ZI) form a
high-pass filter with the corner frequency determined in Equation 6.
(6)
The value of CI is important, as it directly affects the bass (low frequency) performance of the circuit. Consider
the example where ZI is 241 k and the specification calls for a flat bass response down to 20 Hz. Equation 6 is
reconfigured as Equation 7.
(7)
20
Copyright 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPA3001D1
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