TAS5780M datasheet(79/204 Pages) TI1

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TAS5780M

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SLASEG7 – DECEMBER 2016

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Power Supplies (continued)

The outputs of the high-performance DACs used in the TAS5780M device are ground centered, requiring both a

positive low-voltage supply and a negative low-voltage supply. The positive power supply for the DAC output

stage is taken from the AVDD pin, which is connected to the DVDD supply provided by the system. A charge

pump is integrated in the TAS5780M device to generate the negative low-voltage supply. The power supply input

for the charge pump is the CPVDD pin. The CPVSS pin is provided to allow the connection of a filter capacitor

on the negative low-voltage supply. As is the case with the other supplies, the component selection, placement,

and routing of the external components for these low voltage supplies are shown in the TAS5780M and should

be followed as closely as possible to ensure proper operation of the device.

11.1.2 PVDD Supply

The output stage of the speaker amplifier drives the load using the PVDD supply. This is the power supply which

provides the drive current to the load during playback. Proper connection, routing, and decoupling techniques are

highlighted in the TAS5780MEVM and must be followed as closely as possible for proper operation and

performance. Due to the high-voltage switching of the output stage, it is particularly important to properly

decouple the output power stages in the manner described in the TAS5780M deviceApplication and

Implementation . Lack of proper decoupling, like that shown in the Application and Implementation , results in

voltage spikes which can damage the device.

A separate power supply is required to drive the gates of the MOSFETs used in the output stage of the speaker

amplifier. This power supply is derived from the PVDD supply via an integrated linear regulator. A GVDD_REG

pin is provided for the attachment of decoupling capacitor for the gate drive voltage regulator. 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 circuitry. Additional loading on

this pin could cause the voltage to sag, negatively affecting the performance and operation of the device.

TAS5780M Datasheet(PDF) 79 Page - Texas Instruments