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

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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

V5

VNN

RVNN2

RVNN1

TA2022

18 VNNSENSE

V5

VPP

RVNN2 RVPP1

19 VPPSENSE

Figure 10: Two Resistor Sense Circuit

The equation for calculating RVPP1 is as follows:

R VPP1 = VPP

I VPPSENSE

Set R VPP2 = R VPP1 .

The equation for calculating RVNNSENSE is as follows:

R VNN1 = VNN

IVNNSENSE

Set R VNN2 = 3 × R VNN1 .

IVPPSENSE or IVNNSENSE can be any of the currents shown in the Electrical Characteristics table

for VPPSENSE and VNNSENSE, respectively.

Example: Nominal supply voltage – +/-32.5V +/-10%

From this information, a value of RVPP1, RVPP2, RVNN1, and RVNN2 can be calculated using the above

formulas.

VPP MAX = 32.5V × 1.1 = 35.75V use 36V

VNN MAX = −32.5V × 1.1 = −35.75V use - 36V

RVPP1 = 36V = 260.87 kΩ

138 µA

Set RVPP2 = 261kΩ,1% .

use 261kΩ,1%

where IVPPSENSE is the minimum over-voltage turn off current for VPPSENSE.

RVNN2 = 36V = 236.84 kΩ

152 µA

Set RVNN2 = 715 kΩ,1% .

use 237 kΩ,1%

where IVNNSENSE is the minimum over-voltage turn off current for VNNSENSE.

27

TA2022 – KLI/1.2/07-04

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