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參數(shù)資料
| 型號： | TA2021B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEREO 25W (4OHM) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING (DPP) TECHNOLOGY |
| 中文描述： | 立體聲25瓦（4Ω）類- T的數(shù)字音頻放大器驅(qū)動程序使用數(shù)字功率處理（民進黨）科技 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 268K |
| 代理商： | TA2021B |
Tripath Technology, Inc. - Technical Information
6
TA2021B – 3.0/04.03
External Components Description
(Refer to the Application/Test Circuit)
Components
Description
R
I
Inverting Input Resistance to provide AC gain in conjunction with R
F
. This
input is biased at the BIASCAP voltage (approximately 2.4VDC).
Feedback resistor to set AC gain in conjunction with R
I
;
Please refer to the Amplifier Gain paragraph in the Application Information
section.
AC input coupling capacitor which, in conjunction with R
I
, forms a highpass
filter at
)
C
R
2
(
1
f
I
I
C
π
=
Bias resistor. Locate close to pin 6 and ground at pin 8.
BIASCAP decoupling capacitor. Should be located close to pin 16.
Charge pump input capacitor. This capacitor should be connected directly
between pins 2 and 3 and located physically close to the TA2028.
Charge pump output capacitor that enables efficient high side gate drive for
the internal H-bridges. To maximize performance, this capacitor should be
connected directly between pin 36 (CPUMP) and pin 34 (VDDA). Please
observe the polarity shown in the Application/ Test Circuit.
Supply decoupling for the low current power supply pins. For optimum
performance, these components should be located close to the pin and
returned to their respective ground as shown in the Application/Test Circuit.
Supply decoupling for the high current, high frequency H-Bridge supply pins.
These components must be located as close to the device as possible to
minimize supply overshoot and maximize device reliability. Both the high
frequency bypassing (0.1uF) and bulk capacitor (180uF) should have good
high frequency performance including low ESR and low ESL. Panasonic
HFQ or FC capacitors are ideal for the bulk capacitor.
Zobel Capacitor.
Zobel resistor, which in conjunction with C
Z
, terminates the output filter at
high frequencies. The combination of R
Z
and C
Z
minimizes peaking of the
output filter under both no load conditions or with real world loads, including
loudspeakers which usually exhibit a rising impedance with frequency.
Schottky diodes that minimize undershoots of the outputs with respect to
power ground during switching transitions. For maximum effectiveness,
these diodes must be located close to the output pins and returned to their
respective PGND. Please see Application/Test Circuit for ground return pin.
Schottky diodes that minimize overshoots of the outputs with respect to V
DD
during switching transitions (required for applications where V
DD
>13.5V).
For maximum effectiveness, these diodes must be located close to the
output pins and returned to their respective V
DD
pins. Please see
Application/Test Circuit for V
DD
return pin.
Output inductor, which in conjunction with C
O
, demodulates (filters) the
switching waveform into an audio signal. Forms a second order filter with a
cutoff frequency of
)
C
L
2
(
1
f
O
O
C
π
=
and a quality factor of
Q
=
.
Output capacitor.
Differential Output Capacitor.
R
F
)
R
/
R
(
12
A
I
F
V
=
.
C
I
R
REF
C
A
C
D
C
P
C
S
C
SW
C
Z
R
Z
D
O
D
H
L
O
O
O
O
L
C
L
C
R
C
O
C
DO
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