TK2070 Ver la hoja de datos (PDF) - Tripath Technology Inc.
Número de pieza
componentes Descripción
Fabricante
TK2070
Tripath Technology Inc.
TK2070 Datasheet PDF : 21 Pages
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Tripath Technology, Inc. - Technical Information
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
RI
RF
CI
RFBB
RFBC
CFB
ROFA
ROFB
RREF
CS
CZ
RZ
LO
CO
CHBR
CBOOT
DBOOT
CDM
8
Description
Inverting input resistance to provide AC gain in conjunction with RF. This input is
biased at the BIASCAP voltage (approximately 2.5VDC).
Feedback resistor to set AC gain in conjunction with RI. Please refer to the Amplifier
Gain paragraph, in the Application Information section.
AC input coupling capacitor, which, in conjunction with RI, forms a high pass filter at
fC = 1 (2πRICI) .
Feedback divider resistor connected to AGND. The value of this resistor depends
on the supply voltage setting and helps set the TK2070 gain in conjunction with RI,
RF, RFBA, and RFBC. Please see the Modulator Feedback Design paragraphs in the
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 TK2070 gain in
conjunction with RI, RF, RFBA, and RFBB. It should be noted that the resistor from
OUT1/OUT2 to FBKOUT1/FBKOUT2 must have a power rating of greater than
PDISS = VPP2 (2RFBC) . Please see the Modulator Feedback Design paragraphs in the
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 CFB 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.
Potentiometer used to manually trim the DC offset on the output of the TK2070.
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 RZ, terminates the output filter at high
frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.
Zobel resistor, which in conjunction with CZ, terminates the output filter at high
frequencies. The combination of RZ and CZ 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.
Output inductor, which in conjunction with CO, demodulates (filters) the switching
waveform into an audio signal. Forms a second order filter with a cutoff frequency
of fC = 1 (2 π L O C O ) and a quality factor of Q = R L C O L O C O .
Output capacitor, which, in conjunction with LO, demodulates (filters) the switching
waveform into an audio signal. Forms a second order low-pass filter with a cutoff
frequency of fC = 1 (2 π L O C O ) and a quality factor of Q = R L C O L O C O . Use
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 VCC – GND on each supply pin. A 50V rating is
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 VCC voltage. Thus a 50V (or greater) diode should be
used.
Differential mode capacitor that reduces residual switching noise.
TK2070 – MC/2.1/10-03
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