TK2019 Tripath, TK2019 Datasheet - Page 8

• Manufacturer Part Number: TK2019
• Description: STEREO 20W (4OHM) CLASS-T DIGITAL AUDIO AMPLIFIER
• Manufacturer: Tripath

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
Components
R
R
C
R
R
C
R
R
R
C
C
R
L
C
C
C
D
C
8
O
I
F
I
FBB
FBC
FB
OFB
OFA
REF
S
Z
Z
O
HBR
BOOT
BOOT
DM
Description
Inverting input resistance to provide AC gain in conjunction with R
biased at the BIASCAP voltage (approximately 2.5VDC).
Feedback resistor to set AC gain in conjunction with R
Gain paragraph, in the Application Information section.
AC input coupling capacitor, which, in conjunction with R
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
R
Application Information Section.
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
OUT1/OUT2 to FBKOUT1/FBKOUT2 must have a power rating of greater than
Application Information Section.
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
so that the idle switching difference is greater than 40kHz. Please refer to the
Application / Test Circuit.
Potentiometer used to manually trim the DC offset on the output of the TK2019.
Resistor that limits the manual DC offset trim range and allows for more precise
adjustment.
Bias resistor. Locate close to pin 15 and ground at pin 20.
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.
Zobel capacitor, which in conjunction with R
frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.
Zobel resistor, which in conjunction with C
frequencies. The combination of R
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.
Output inductor, which in conjunction with C
waveform into an audio signal. Forms a second order filter with a cutoff frequency
of
Output capacitor, which, in conjunction with L
waveform into an audio signal. Forms a second order low-pass filter with a cutoff
frequency of
a high quality film capacitor capable of sustaining the ripple current caused by the
switching outputs. Electrolytic capacitors should not be used.
High-frequency bypass capacitor for V
required for this component.
Boot strap capacitor that enables the charge pump for the high side gate drive for
the internal H-bridge.
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.
Differential mode capacitor that reduces residual switching noise.
f
P
C
DISS
F,
=
f
R
C
1
=
FBA,
2 (
=
VPP
π
1
R
and R
I
2 (
C
2
I
)
(2R
π
.
f
C
FBC
L
FBC
=
O
. Please see the Modulator Feedback Design paragraphs in the
)
I,
1
C
. Please see the Modulator Feedback Design paragraphs in the
R
O
2 (
F,
)
π
R
and a quality factor of
FBA,
L
O
and R
FB
C
O
should be offset between channel 1 and channel 2
)
and a quality factor of
FBB
Z
and C
. It should be noted that the resistor from
DD
– GND on each supply pin. A 35V rating is
Z
Z
, terminates the output filter at high
Z
O
minimizes peaking of the output filter
(Refer to the Application/Test Circuit)
, terminates the output filter at high
, demodulates (filters) the switching
O
Q =
, demodulates (filters) the switching
T r i p a t h T e c h n o l o g y , I n c . - T e c h n i c a l I n f o r m a t i o n
R
L
C
I
. Please refer to the Amplifier
O
I
, forms a high pass filter at
Q =
L
R
O
TK2019 – MC/2.1/10-03
C
L
C
O
F
O
. This input is
.
L
O
C
O
.
Use
I,