TK2150 Ver la hoja de datos (PDF) - Tripath Technology Inc.

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TK2150

STEREO 200W (6Ω) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSINGtm TECHNOLOGY

Tripath Technology Inc. 

1/2 TC2001

Tripath Technology, Inc. - Technical Information

V5

RFBA

Processing

&

M o d u la tio n

FBKOUT1 28

FBKGND1 27

RFBB

RFBA

RFBC

RFBC

RFBB

OUT1

OUT1 GROUND

AGND

Figure 3: 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=40V and VNNMAX=-40V,

RFBA = 1kΩ, 1%

RFBB = 1.097kΩ, use 1.1kΩ, 1%

RFBC = 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

Mute

When a logic high signal is supplied to MUTE, both amplifier channels are muted (both high- and

low-side transistors are turned off). When a logic level low is supplied to MUTE, both amplifiers

20

TK2150 – Rev. 1.0/12.02

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