TDA2075A Datasheet, PDF (17/24 Pages) Tripath Technology Inc. – STEREO CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSINGTM TECHNOLOGY

Tripath Technology, Inc. - Technical Information
For SPLIT-SUPPLY operation:
The modulator feedback resistors are:
RFBA = User specified, typically 1K Ω
R FBB = ^{RFBA * VPP}
(VPP - 4)
R FBC = ^{R FBA * VPP}
4
AV - 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 a SPLIT-SUPPLY of VPP_MAX=40V and VNN_MAX=-40V,
R_FBA = 1kΩ, 1%
R_FBB = 1.111kΩ, use 1.1kΩ, 1%
R_FBC = 10.0kΩ, use 10.0kΩ, 1%
The resultant modulator gain is:
AV - MODULATOR ≈ ^{10.0k Ω * (1.0k Ω + 1.1k Ω )} + 1 = 20.09V/V
1.0k Ω *1.1k Ω
For SINGLE-SUPPLY operation:
The modulator feedback resistors are:
RFBB = User specified, typically 1K Ω
R FBC = 350 * VPP − 1000
R FBB = ^{2333.33 * R FBC}
(1000 + RFBC )
AV - MODULATOR ≈ ^{R FBC * (R FBA + R FBB )} + 1
R FBA * R FBB
For example, in a system with a SINGLE-SUPPLY of VPP_MAX = 40V,
R_FBA = 2.17kΩ, use 2.15kΩ, 1%
R_FBB = 1kΩ, 1%
R_FBC = 13.0kΩ, use 13.0kΩ, 1%
The resultant modulator gain is:
AV - MODULATOR ≈ ^{13.0k Ω * (1.0k Ω + 2.15k Ω )} + 1 = 20.05V/V
1.0k Ω * 2.15k Ω
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TDA2075A – Rev. 0.9/KLi/10.05