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TA2022

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

Tripath Technology Inc. 

Tripath Technology, Inc. - Technical Information

1/2 TA2022

V5

RFBA RFBA

Processing

&

Modulation

FBKOUT1

FBKGND1

RFBC

RFBC

OUT1

OUT 1 GROUND

RFBB RFBB

AGND

Figure 2: Modulator Feedback

The modulator feedback resistors are:

RFBA = User specified, typically 1K Ω

R FBB = RFBA * VPP

(VPP - 4)

R FBC = R FBA * VPP

4

A V - MODULATOR ≈ R FBC * (R FBA + R FBB ) + 1

R FBA * R FBB

The above equations assume that VPP=|VNN|.

For example, in a system with VPPMAX=36V and VNNMAX=-36V,

RFBA = 1kΩ, 1%

RFBB = 1.125kΩ, use 1.13kΩ, 1%

RFBC = 9.0kΩ, use 9.09kΩ, 1%

The resultant modulator gain is:

AV - MODULATOR ≈ 9.09k Ω * (1.0k Ω + 1.13k Ω ) + 1 = 18.13V/V

1.0k Ω * 1.13k Ω

17

TA2022 – KLI/1.2/07-04

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