TC2000 datasheet(5/9 Pages) TRIPATH

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TC2000 – KLI/1.1/12-03

EXTERNAL COMPONENTS DESCRIPTION (Refer to the Application/Test Circuit)

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.

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

)

(

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, RFBB,

and RFBC. Please see the Modulator Feedback Design paragraphs in the

Application Information Section.

RFBC

Feedback resistor connected from either the OUT1A/OUT2A to FDBKP1/FDBKP2

or OUT1B/OUT2B to FDBKN1/FDBKN2. The value of this resistor depends on

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

. Please see the Modulator Feedback Design paragraphs in

the Application Information Section.

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. Please refer to the

Application / Test Circuit.

ROFB

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

ROFA

Resistor that limits the manual DC offset trim range and allows for more precise

adjustment.

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 TC2000 and returned to their

respective ground as shown in the Application/Test Circuit.

RVNNSENSE

Resistor used to terminate the VNNSENSE pin to AGND.

RVPPSENSE

Resistor used to terminate the VPPSENSE pin to 5V.

APPLICATION INFORMATION

T K 2050 Basic A m p lifier Op eratio n

The TC2000 is a 5V CMOS signal processor that amplifies the audio input signal and converts the

audio signal to a switching pattern. This switching pattern is spread spectrum with a typical idle

switching frequency of about 650kHz externally set by the CFB. The switching patterns for the two

channels are not synchronized and the idle switching frequencies should differ by at least 40kHz to

avoid increasing the audio band noise floor. The idle frequency difference can be accomplished by

offsetting the value of CFB for each channel. Typical values of CFB with the TP2050 are 470pF for

channel 1 and 390pF for channel 2.

Complementary copies of the switching pattern are output through the Y1 and Y1B pins and the Y2

and Y2B pins. These signals are used to drive the inputs of a MOSFET driver. In the generation of

the patterns for the MOSFET driver the TC2000 inserts a “break-before-make” dead time between the

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