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參數資料
| 型號： | TPA701DRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 8/28頁 |
| 文件大小： | 790K |
| 代理商： | TPA701DRG4 |
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TPA701
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
SLOS229D – NOVEMBER1998 – REVISED MAY 2003
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 RF above 50 k, the amplifier tends to become unstable due
to a pole formed from RF 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 RF when RF 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
f
c(lowpass) +
1
2
pR
F
C
F
For example, if RF is 100 k and CF is 5 pF, then fco is 318 kHz, which is well outside of audio range.
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 RI form a high-pass filter with the corner frequency
determined in equation 8.
(8)
–3 dB
fc
f
c(highpass) +
1
2
pR
I
C
I
The value of CI is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where RI is 10 k and the specification calls for a flat bass response down to 40 Hz.
Equation 8 is reconfigured as equation 9.
(9)
C
I +
1
2
pR
I
fc
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