TA3020 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

TA3020

STEREO 300W (4Ω) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING (DPP™ ) TECHNOLOGY

Unspecified 

Tripath Technology, Inc. - Technical Information

1/2 TA3020

V5

RFBA RFBA

Processing

&

Modulation

FBKOUT1

FBKGND1

RFBC

RFBC

OUT1

OUT 1 GROUND

RFBB RFBB

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=52V and VNNMAX=-52V,

RFBA = 1kΩ, 1%

RFBB = 1.08kΩ, use 1.07kΩ, 1%

RFBC = 13.0kΩ, use 13.3kΩ, 1%

The resultant modulator gain is:

AV - MODULATOR ≈ 13.3k Ω * (1.0k Ω + 1.07k Ω ) + 1 = 26.73V/V

1.0k Ω * 1.07k 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 are fully operational.

There is a delay of approximately 200 milliseconds between the de-assertion of MUTE and the un-muting of the

TA3020.

Turn-on & Turn-off Noise

If turn-on or turn-off noise is present in a TA3020 amplifier, the cause is frequently due to other circuitry

external to the TA3020. While the TA3020 has circuitry to suppress turn-on and turn-off transients, the

combination of the power supply and other audio circuitry with the TA3020 in a particular application may

18

TA3020 – KL Rev. 3.0/09.03

Share Link: