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參數(shù)資料
| 型號： | TPA152DRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.075 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 430K |
| 代理商： | TPA152DRG4 |
TPA152
75-mW STEREO AUDIO POWER AMPLIFIER
SLOS210A – JUNE 1998 – REVISED MARCH 2000
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting resistors, RF and RI
The gain for the TPA152 is set by resistors RF and RI according to equation 1.
(1)
Gain
+*
R
F
R
I
Given that the TPA152 is a MOS amplifier, the input impedance is very high, consequently input leakage
currents are not generally a concern although noise in the circuit increases as the value of RF increases. In
addition, a certain range of RF values are required for proper start-up operation of the amplifier. Taken together
it is recommended that the effective impedance seen by the inverting node of the amplifier be set between 5
k
and 20 k. The effective impedance is calculated in equation 2.
(2)
Effective Impedance
+
R
FRI
R
F ) RI
As an example, consider an input resistance of 20 k
and a feedback resistor of 20 k. The gain of the amplifier
would be – 1 and the effective impedance at the inverting terminal would be 10 k
, which is 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. This, in effect, creates a
low-pass filter network with the cutoff frequency defined in equation 3.
(3)
f
c(lowpass) +
1
2
pR
F CF
For example if RF is 100 k and CF is 5 pF then fco(lowpass) is 318 kHz, which is well outside the 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 4.
(4)
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 20 k and the specification calls for a flat bass response down to 20 Hz.
Equation 4 is reconfigured as equation 5.
(5)
C
I +
1
2
pR
I
f
c(highpass)
In this example, CI is 0.40 F, so one would likely choose a value in the range of 0.47 F to 1 F. A further
consideration for this capacitor is the leakage path from the input source through the input network (RI, CI) and
the feedback resistor (RF) to the load. This leakage current creates a dc offset voltage at the input to the amplifier
that reduces useful headroom, especially in high-gain applications (> 10). For this reason a low-leakage
tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the
capacitor should face the amplifier input in most applications, as the dc level there is held at VDD/2, which is
likely higher that the source dc level. Please note that it is important to confirm the capacitor polarity in the
application.
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