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參數(shù)資料
| 型號： | TA3020 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Stereo 300W (4з) Class-T Digital Audio Amplifier Driver using Digital Power ProcessingTM Technology |
| 中文描述： | 立體聲300W的（4з）類- T數(shù)字音頻放大器驅(qū)動器使用數(shù)字電源ProcessingTM技術(shù) |
| 文件頁數(shù)： | 19/29頁 |
| 文件大?。?/td> | 284K |
| 代理商： | TA3020 |
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T E C H N I C A L I N F O R M A T I O N
TA3020, Rev 2.1, 01.01
19
Input Capacitor Selection
C
IN
can be calculated once a value for R
IN
has been determined. C
IN
and R
IN
determine the input
low-frequency pole. Typically this pole is set at 10Hz. C
IN
is calculated according to:
C
IN
= 1 / (2
π
x F
P
x R
IN
)
where: R
IN
= Input resistor value in ohms
F
P
= Input low frequency pole (typically 10Hz)
Modulator Feedback Design
The modulator converts the signal from the input stage to the high-voltage output signal. The
optimum gain of the modulator is determined from the maximum allowable feedback level for the
modulator and maximum supply voltages for the power stage. Depending on the maximum supply
voltage, the feedback ratio will need to be adjusted to maximize performance. The values of R
FBA
,
R
FBB
and R
FBC
(see explanation below) define the gain of the modulator. Once these values are
chosen, based on the maximum supply voltage, the gain of the modulator will be fixed even with as
the supply voltage fluctuates due to current draw.
For the best signal-to-noise ratio and lowest distortion, the maximum modulator feedback voltage
should be approximately 4Vpp. This will keep the gain of the modulator as low as possible and still
allow headroom so that the feedback signal does not clip the modulator feedback stage.
Figure 3 shows how the feedback from the output of the amplifier is returned to the input of the
modulator. The input to the modulator (FBKOUT1/FBKGND1 for channel 1) can be viewed as inputs
to an inverting differential amplifier. R
FBA
and R
FBB
bias the feedback signal to approximately 2.5V
and R
FBC
scales the large OUT1/OUT2 signal to down to 4Vpp.
Figure 3: Modulator Feedback
V5
RFBB
FBKGND1
OUT1
OUT 1 GROUND
RFBA
RFBC
FBKOUT1
RFBA
&
AGND
1/2 TA3020
RFBB
Modulation
Processing
RFBC
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