TA3020 Ver la hoja de datos (PDF) - Tripath Technology Inc.

Número de pieza

componentes Descripción

Fabricante

TA3020

Stereo 300W (4Ω) Class-T Digital Audio Amplifier Driver using Digital Power Processing™ Technology

Tripath Technology Inc. 

TECHNICAL INFORMATION

External Components Description (Refer to the Application/Test Circuit)

Components

RI

RF

CI

RFBA

RFBB

RFBC

CFB

ROFA

ROFB

RREF

CA

DB

CB

CBAUX

RB

CSW

CS

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 highpass filter at

fC = 1 (2πRICI) .

Feedback divider resistor connected to V5. This resistor is normally set at 1kΩ.

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

on the supply voltage setting and helps set the TA3020 gain in conjunction with RI,

RF, RFBA, and RFBC. Please see the Modulator Feedback Design paragraphs in the

Application Information Section.

Feedback resistor connected from either the OUT1(OUT2) to FBKOUT1(FBKOUT2)

or speaker ground to FBKGND1(FBKGND2). The value of this resistor depends on

the supply voltage setting and helps set the TA3020 gain in conjunction with RI, RF,

RFBA,, and RFBB. It should be noted that the resistor from OUT1(OUT2) to

FBKOUT1(FBKOUT2) must have a power rating of greater than PDISS = VPP2 (2RFBC) .

Please see the Modulator Feedback Design paragraphs in the Application

Information Section.

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.

Potentiometer used to manually trim the DC offset on the output of the TA3020.

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

adjustment.

Bias resistor. Locate close to pin 32 and ground at pin 28.

BIASCAP decoupling capacitor. Should be located close to pin 19 and grounded at

pin 28.

Bootstrap diode. This diode charges up the bootstrap capacitors when the output is

low (at VNN) to drive the high side gate circuitry. A fast or ultra fast recovery diode

is recommended for the bootstrap circuitry. In addition, the bootstrap diode must be

able to sustain the entire VPP-VNN voltage. Thus, for most applications, a 150V (or

greater) diode should be used.

High frequency bootstrap capacitor, which filters the high side gate drive supply.

This capacitor must be located as close to pin 40 (VBOOT1) or pin10 (VBOOT2) for

reliable operation. The “negative” side of CB should be connected directly to the

HO1COM (pin 46) or HO2COM (pin 4). Please refer to the Application / Test Circuit.

Bulk bootstrap capacitor that supplements CB during “clipping” events, which result

in a reduction in the average switching frequency.

Bootstrap resistor that limits CBAUX charging current during TA3020 power up

(bootstrap supply charging).

VN10 generator filter capacitors. The high frequency capacitor (0.1uF) must be

located close to pin 1 (VN10) to maximize device performance.

Supply decoupling for the power supply pins. For optimum performance, these

components should be located close to the TA3020 and returned to their respective

8

TA3020, Rev 2.1, 01.01

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