TA2021B データシートの表示（PDF） - Tripath Technology Inc.
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TA2021B
Tripath Technology Inc.
TA2021B Datasheet PDF : 12 Pages
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Tripath Technology, Inc. - Technical Information
External Components Description (Refer to the Application/Test Circuit)
Components
RI
RF
CI
RREF
CA
CD
CP
CS
CSW
CZ
RZ
DO
DH
LO
CO
CDO
Description
Inverting Input Resistance to provide AC gain in conjunction with RF. This
input is biased at the BIASCAP voltage (approximately 2.4VDC).
Feedback resistor to set AC gain in conjunction with RI; AV = 12(RF / RI) .
Please refer to the Amplifier Gain paragraph in the Application Information
section.
AC input coupling capacitor which, in conjunction with RI, forms a highpass
filter at fC = 1 (2πRICI)
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 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 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 VDD
during switching transitions (required for applications where VDD >13.5V).
For maximum effectiveness, these diodes must be located close to the
output pins and returned to their respective VDD pins. Please see
Application/Test Circuit for VDD return pin.
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 (2π L O C O ) and a quality factor of
Q = RLCO LOCO .
Output capacitor.
Differential Output Capacitor.
6
TA2021B – 3.0/04.03
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