TCA2002 datasheet(7/18 Pages) TRIPATH

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Tri p ath Techn o l o g y, I n c. - T echn i cal I n fo rmation

TCA2002 – KLi/0.95/04.06

EXTERNAL COM P ONENTS DESCR I PTION (Refer to the Application/Test Circuits)

Component

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.

BIASCAP decoupling capacitor. Should be located close to pin 1 and grounded at

pin 20.

AC input coupling capacitor, which, in conjunction with RI, forms a high pass filter

)

(

RFBA

Feedback resistor divider connected to 5V. This resistor is normally set to 1k

Ω.

RFBB

Feedback divider resistor connected to AGND. The value of this resistor depends

on the supply voltage setting and helps set gain in conjunction with RI, RF, RFBA

,RFBB, and RFBC.

RFBC

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 RI, RF, RFBBA, RFBB, and RFBC. It should be noted that the resistor

from OUT1/OUT2 to FBKOUT1/FBKOUT2 must have a power rating of greater

than

)

(2R

VPP

FBC

DISS =

CFB

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 CFB should be offset between channel 1 and channel 2

so that the idle switching difference is greater than 40kHz.

ROFA

Potentiometer used to manually trim the DC offset on the speaker output.

ROFB

Resistors that limit the manual DC offset trim range and allows for more precise

adjustment.

COF

Supply decoupling for the offset trim circuit.

RREF

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.

RVNN1

Main over-voltage and under-voltage sense resistor for the negative supply

(VNN).

RVNN2

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.

RVPP1

Main over-voltage and under-voltage sense resistor for the positive supply (VPP).

RVPP2

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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