TCA2002 Datasheet, PDF (7/18 Pages) Tripath Technology Inc. – STEREO CLASS-T™ AUDIO CONTROLLER USING DIGITAL POWER PROCESSING (DPP™) TECHNOLOGY

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 Circuits)
Component
R_I
R_F
C_A
C_I
R_FBA
R_FBB
R_FBC
C_FB
R_OFA
R_OFB
C_OF
R_REF
C_S
R_VNN1
R_VNN2
R_VPP1
R_VPP2
Description
Inverting input resistance to provide AC gain in conjunction with R_F. This input is
biased at the BIASCAP voltage (approximately 2.5VDC).
Feedback resistor to set AC gain in conjunction with R_I. Please refer to the
Amplifier Gain paragraph, in the Application Information section.
BIASCAP decoupling capacitor. Should be located close to pin 1 and grounded at
pin 20.
AC input coupling capacitor, which, in conjunction with R_I, forms a high pass filter
at _{fC = 1 (2πRICI)} .
Feedback resistor divider connected to 5V. This resistor is normally set to 1kΩ.
Feedback divider resistor connected to AGND. The value of this resistor depends
on the supply voltage setting and helps set gain in conjunction with R_I, R_F, R_FBA
,^RFBB, ^{and 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 gain in
conjunction with R_I, R_F, R_FBBA, R_FBB, and R_FBC. It should be noted that the resistor
from OUT1/OUT2 to FBKOUT1/FBKOUT2 must have a power rating of greater
than_{PDISS = VPP}² _(2RFBC) .
Feedback delay capacitor that both lowers the idle switching frequency and filters
very 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.
Potentiometer used to manually trim the DC offset on the speaker output.
Resistors that limit the manual DC offset trim range and allows for more precise
adjustment.
Supply decoupling for the offset trim circuit.
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 TCA2002 and returned to their
respective ground as shown in the Application/Test Circuit.
Main over-voltage and under-voltage sense resistor for the negative supply
(VNN).
Secondary over-voltage and under-voltage sense resistor for the negative supply
(VNN). This resistor accounts for the internal VNNSENSE bias of 1.25V. Nominal
resistor value should be three times that of RVNN1.
Main over-voltage and under-voltage sense resistor for the positive supply (VPP).
Secondary over-voltage and under-voltage sense resistor for the positive supply
(VNN). This resistor accounts for the internal VPPSENSE bias of 2.5V. Nominal
resistor value should be equal to that of RVPP1.
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TCA2002 – KLi/0.95/04.06