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

Thus, the supply voltage must be outside of the user defined supply range for greater than 200mS for

the TA2022 to be muted.

The equation for calculating RVPPSENSE is as follows:

R VPPSENSE = VPP - 2.5V

IVPPSENSE

The equation for calculating RVNNSENSE is as follows:

R VNNSENSE = 1.25V - VNN

I VNNSENSE

where 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 RVPPSENSE and RVNNSENSE 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

RVPPSENSE = 36V - 2.5V = 242.75 kΩ use 243 kΩ,1%

138 µA

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

RVNNSENSE = 1.25V - - 36V = 245.1 kΩ use 249 kΩ,1%

152 µA

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

Using the resistor values from above, the actual minimum over voltage turn off points will be:

VPP MIN_OV_TUR N_OFF = 243 kΩ × 138 µA + 2.5V = 36.03V

VNN MIN_OV_TUR N_OFF = 1.25V − 249 kΩ × 152 µA = - 36.60V

The other three trip points can be calculated using the same formula but inserting the appropriate

IVPPSENSE (or IVNNSENSE) current value. As stated earlier, the usable supply range is the difference

between the minimum overvoltage turn off and maximum under voltage turn-off for both the VPP and

VNN supplies.

VPP RANGE = VPP MIN_OV_TUR N_OFF - VPP MAX_UV_TUR N_OFF

VNN RANGE = VNN MIN_OV_TUR N_OFF - VNN MAX_UV_TUR N_OFF

Using the resistor values from above, and the maximum under voltage trip currents shown in the

Electrical Characteristics table, the maximum under voltage turn off points will be:

VPP MAX_UV_TUR N_OFF = 243 kΩ × 87 µA + 2.5V = 23.64V

VNN MAX_UV_TUR N_OFF = 1.25V − 249 kΩ × 95 µA = - 22.41V

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TA2022 – KLI/1.2/07-04

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