TA2022 Ver la hoja de datos (PDF) - Tripath Technology Inc.

Número de pieza

componentes Descripción

Fabricante

TA2022

STEREO 90W (4Ω) CLASS-T™ DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING (DPP™) TECHNOLOGY

Tripath Technology Inc. 

Tripath Technology, Inc. - Technical Information

Bridging the TA2022

The TA2022 can be bridged by returning the signal from OAOUT1 to the input resistor at INV2.

OUT1 will then be a gained version of OAOUT1, and OUT2 will be a gained and inverted version of

OAOUT1 (see Figure 3). When the two amplifier outputs are bridged, the apparent load impedance

seen by each output is halved, so the minimum recommended impedance for bridged operation is 8

ohms. Due to the internal current limit setting, the maximum supply voltage recommended for

bridged operation is +/-30V. Bridged operation into loads below 8ohms is possible, but, as mentioned

above, the amplifier efficiency will be reduced and the amplifier may prematurely current limit. The

TA2022 is capable of 150W into 8 ohms bridged at 0.1% THD+N.

INPUT

RF

CI

RI

OAOUT1

TA2022

V5

INV1

BIASCAP

20k

INV2

20k

OAOUT2

AGND

V5

+

-

AGND

Figure 4: Input Stage Setup for Bridging

The switching outputs, OUT1 and OUT2, are not synchronized, so a common inductor may not be

used with a bridged TA2022. For this same reason, individual zobel networks must be applied to

each output to load each output and lower the Q of each common mode differential LC filter.

Output Voltage Offset

The output offset voltage of the TA2022 is largely determined by the matching of the respective RFBA,

RFBB, and RFBC networks for FBKOUT1(FBKOUT2) and FBKGND1 (FBKOUT2). Thus, the intrinsic

offset of the TA2022 can be altered by the external feedback network resistor matching. To minimize

the nominal untrimmed offset voltage, 1% tolerance resistors are recommended.

In most applications, the output offset voltage will need to be trimmed via an external circuit (either

passive or active). The output offset voltage of the TA2022 can be nulled by modifying the modulator

feedback as shown in Figure 4. Potentiometer ROFA is used to trim the effective resistance seen by

the output ground, and therefore the output offset. ROFB limits the trim range.

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TA2022 – KLI/1.2/07-04

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