參數(shù)資料
型號(hào)： TPA701DR
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Single Audio Amplifier
中文描述： 單音頻放大器
文件頁(yè)數(shù)： 16/22頁(yè)
文件大?。?/td> 393K
代理商： TPA701DR
TPA701
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
SLOS229B – NOVEMBER1998 – REVISED MARCH 2000
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
component selection (continued)
As an example consider an input resistance of 10 k
and a feedback resistor of 50 k
. The BTL gain of the
amplifier would be –10 V/V and the effective impedance at the inverting terminal would be 8.3 k
, which is well
within the recommended range.
For high performance applications, metal film resistors are recommended because they tend to have lower
noise levels than carbon resistors. For values of R
F
above 50 k
, the amplifier tends to become unstable due
to a pole formed from R
F
and the inherent input capacitance of the MOS input structure. For this reason, a small
compensation capacitor of approximately 5 pF should be placed in parallel with R
F
when R
F
is greater than
50 k
. This, in effect, creates a low pass filter network with the cutoff frequency defined in equation 7.
(7)
–3 dB
fc
fc(lowpass)
1
2 RFCF
For example, if R
F
is 100 k
and C
F
is 5 pF, then f
co
is 318 kHz, which is well outside of the audio range.
input capacitor, C
I
In the typical application an input capacitor, C
I
, is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, C
I
and R
I
form a high-pass filter with the corner frequency
determined in equation 8.
(8)
–3 dB
fc
fc(highpass)
1
2 RICI
The value of C
I
is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where R
I
is 10 k
and the specification calls for a flat bass response down to 40 Hz.
Equation 8 is reconfigured as equation 9.
(9)
CI
1
2 RIfc
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相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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