參數(shù)資料
型號(hào)： TK2019
廠商： Electronic Theatre Controls, Inc.
英文描述： STEREO 20W (4OHM) CLASS-T DIGITAL AUDIO AMPLIFIER
中文描述： 立體聲20瓦（4Ω）類- T的數(shù)字音頻放大器
文件頁(yè)數(shù)： 8/21頁(yè)
文件大?。?/td> 414K
代理商： TK2019
Tripath Technology, Inc. - Technical Information
8
TK2019 – MC/2.1/10-03
E X T E R N A L C O M P O N E N T S D E S C R I P T I O N
(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 2.5VDC).
R
F
Feedback resistor to set AC gain in conjunction with R
I
. Please refer to the Amplifier
Gain paragraph, in the Application Information section.
C
I
AC input coupling capacitor, which, in conjunction with R
I
, forms a high pass filter at
)
C
R
2
(
1
f
I
I
C
π
=
.
R
FBB
Feedback divider resistor connected to AGND. The value of this resistor depends
on the supply voltage setting and helps set the TK2019 gain in conjunction with R
I,
R
F,
R
FBA,
and R
FBC
. Please see the Modulator Feedback Design paragraphs in the
Application Information Section.
R
FBC
Feedback resistor connected from either the OUT1A/OUT2A to
FBKOUT1/FBKOUT2 or OUT1B/OUT2B to FBKGND1/FBKGND2. The value of this
resistor depends on the supply voltage setting and helps set the TK2019 gain in
conjunction with R
I,
R
F,
R
FBA,
and R
FBB
. It should be noted that the resistor from
OUT1/OUT2 to FBKOUT1/FBKOUT2 must have a power rating of greater than
)
(2R
VPP
P
FBC
. Please see the Modulator Feedback Design paragraphs in the
Application Information Section.
C
FB
Feedback delay capacitor that both lowers the idle switching frequency and filters
high frequency noise from the feedback signal, which improves amplifier
performance. The value of C
FB
should be offset between channel 1 and channel 2
so that the idle switching difference is greater than 40kHz. Please refer to the
Application / Test Circuit.
R
OFB
Potentiometer used to manually trim the DC offset on the output of the TK2019.
R
OFA
Resistor that limits the manual DC offset trim range and allows for more precise
adjustment.
R
REF
Bias resistor. Locate close to pin 15 and ground at pin 20.
S
Supply decoupling for the power supply pins. For optimum performance, these
components should be located close to the TC2001/TPS1035 and returned to their
respective ground as shown in the Application/Test Circuit.
C
Z
Zobel capacitor, which in conjunction with R
Z
, terminates the output filter at high
frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.
R
Z
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 increasing frequency. The recommended
power rating is 1 Watt.
L
O
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
C
O
waveform into an audio signal. Forms a second order low-pass filter with a cutoff
frequency of
)
C
L
2
(
1
f
O
O
C
π
=
and a quality factor of
a high quality film capacitor capable of sustaining the ripple current caused by the
switching outputs. Electrolytic capacitors should not be used.
C
HBR
High-frequency bypass capacitor for V
DD
– GND on each supply pin. A 35V rating is
required for this component.
C
BOOT
Boot strap capacitor that enables the charge pump for the high side gate drive for
the internal H-bridge.
D
BOOT
Bootstrap diode. This diode charges up the bootstrap capacitor when the output is
at ground to drive the high side gate circuitry. A fast or ultra fast recovery diode is
recommended for the bootstrap circuitry. In addition, the bootstrap diode must be
able to sustain the entire VDD voltage. Thus a 50V (or greater) diode should be
used.
C
DM
Differential mode capacitor that reduces residual switching noise.
2
DISS
=
O
O
O
L
C
L
C
R
Q
=
.
Output capacitor, which, in conjunction with L
O
, demodulates (filters) the switching
O
O
O
L
C
L
C
R
Q
=
.
Use
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