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參數(shù)資料
| 型號(hào)： | TPA4861D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大小： | 623K |
| 代理商： | TPA4861D |
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SINGLE-ENDED OPERATION
Audio
Input
VDD
6
5
8
VO1
VO2
VDD
2
3
4
IN +
IN
BYPASS
VDD/2
CI
RI
RF
CS
CB
250-mW
External
Speaker
CSE = 0.1 F
RSE = 50
CC
+
+
Gain + *
R
F
R
I
(11)
1
C
B
25 k
v
1
C
I RI
1
R
LCC
(12)
OUTPUT COUPLING CAPACITOR, CC
f
out high +
1
2p R
L CC
(13)
TPA4861
SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004
Figure 38 is a schematic diagram of the recommended SE configuration. In SE mode configurations, the load
should be driven from the primary amplifier output (VO1, terminal 5).
Figure 38. Singled-Ended Mode
Gain is set by the RF and RI resistors and is shown in Equation 11. Because the inverting amplifier is not used to
mirror the voltage swing on the load, the factor of 2 is not included.
The phase margin of the inverting amplifier into an open circuit is not adequate to ensure stability, so a
termination load should be connected to VO2. This consists of a 50- resistor in series with a 0.1-F capacitor to
ground. It is important to avoid oscillation of the inverting output to minimize noise and power dissipation.
The output coupling capacitor required in single-supply SE mode also places additional constraints on the
selection of other components in the amplifier circuit. The rules described earlier still hold with the addition of the
following relationship:
In the typical single-supply SE configuration, an output coupling capacitor (CC) is required to block the dc bias at
the output of the amplifier thus preventing dc currents in the load. As with the input coupling capacitor, the output
coupling capacitor and impedance of the load form a high-pass filter governed by Equation 13.
The main disadvantage, from a performance standpoint, is that the load impedances are typically small, which
drives the low-frequency corner higher. Large values of CC are required to pass low frequencies into the load.
Consider the example where a CC of 68 F is chosen and loads vary from 8 , 32 , and 47 k. Table 2
summarizes the frequency response characteristics of each configuration.
18
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