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TC2000 Datasheet(PDF) 5 Page - Tripath Technology Inc. |
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TC2000 Datasheet(HTML) 5 Page - Tripath Technology Inc. |
5 / 9 page Tr i p ath Technol ogy, I n c. - Techni cal I n for m ati on 5 TC2000 – KLI/1.1/12-03 EXTERNAL COMPONENTS DESCRIPTION (Refer to the Application/Test Circuit) Component Description RI Inverting input resistance to provide AC gain in conjunction with RF. This input is biased at the BIASCAP voltage (approximately 2.5VDC). RF Feedback resistor to set AC gain in conjunction with RI. Please refer to the Amplifier Gain paragraph, in the Application Information section. CI AC input coupling capacitor, which, in conjunction with RI, forms a high pass filter at ) C R 2 ( 1 f I I C π = . 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 P FBC 2 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. CS 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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