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

7

TCA2002 – KLi/0.95/04.06

Component

Description

biased at the BIASCAP voltage (approximately 2.5VDC).

Amplifier Gain paragraph, in the Application Information section.

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

pin 20.

at

)

C

R

2

(

1

f

I

I

C

π

=

.

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

Ω.

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

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

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

than

)

(2R

VPP

P

FBC

2

.

Feedback delay capacitor that both lowers the idle switching frequency and filters

very high frequency noise from the feedback signal, which improves amplifier

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.