參數(shù)資料
型號(hào)： TK2150
廠商： Electronic Theatre Controls, Inc.
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEREO 200W CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING TECHNOLOGY
中文描述： 類立體聲功率200W - T的數(shù)字音頻放大器驅(qū)動(dòng)程序使用數(shù)字功率處理技術(shù)
文件頁(yè)數(shù)： 19/34頁(yè)
文件大?。?/td> 663K
代理商： TK2150
Tripath Technology, Inc. - Technical Information
19
TK2150 – Rev. 1.0/12.02
OAOUT1
INV1
C
I
22
23
+
V5
AGND
R
F
R
I
-
+
OAOUT2
INV2
C
I
27
28
+
V5
AGND
R
F
R
I
-
+
BIASCAP
TC2001
INPUT1
INPUT2
Figure 2: TC2001 Input Stage
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. The modulator feedback resistor R
FBC
should be adjusted so that
the modulator feedback voltage is 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. Increasing the value of R
FBC
will increase the modulator gain.
Sometimes increasing the value of R
FBC
may be necessary to achieve full power for the amplifier
since the input stage for the TC2001 will clip at approximately 4Vpp. This will ensure that the
input stage doesn’t clip before the output 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.
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