TAS5822MDCPR datasheet(77/90 Pages) TI

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9 Power Supply Recommendations

The device requires three power supplies for proper operation. A high-voltage supply calls PVDD is required to

power the output stage of the speaker amplifier and its associated circuitry. One low-voltage power supply which

is calls DVDD is required to power the various low-power portions of the device. The allowable voltage range for

both PVDD and DVDD supply are listed in the Recommended Operating Conditions table. The two power

supplies do not have a required power-up sequence. The power supplies can be powered on in any order. But

once the device has been initialized, PVDD must keep within the normal operation voltage. Once PVDD lower

than 3.5V, all registers need re-initialize again. Recommends waiting 1 ms to 5 ms for the DVDD power supplies

to stabilize before starting I2C communication and providing stable I2S clock before enabling the device outputs.

DVDD

1.8V/3.3VÅ

LDO

Digital IO

Internal Digital

Circuitry

VR_DIG

1.5V

DVDD

PVDD

4.5V~26.4V

LDO

AVDD

Output Stage

Power Supply

Gate Drive/Internal

Analog Circuitry

External Filtering/Decoupling

Figure 9-1. Power Supply Function Block Diagram

9.1 DVDD Supply

The DVDD supply that is required from the system is used to power several portions of the device. As shown in

Figure 9-1, it provides power to the DVDD pin. Proper connection, routing and decoupling techniques are

highlighted in the Section 8 section and the Section 10.2 section and must be followed as closely as possible for

proper operation and performance.

Some portions of the device also require a separate power supply that is a lower voltage than the DVDD supply.

To simplify the power supply requirements for the system, the TAS5822M device includes an integrated low

dropout (LDO) linear regulator to create this supply. This linear regulator is internally connected to the DVDD

supply and its output is presented on the VR_REG pin, providing a connection point for an external bypass

capacitor. It is important to note that the linear regulator integrated in the device has only been designed to

support the current requirements of the internal circuitry, and should not be used to power any additional external

circuity. Additional loading on this pin could cause the voltage to sag, negatively affecting the performance and

operation of the device.

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TAS5822M

SLASEV8 – DECEMBER 2020

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