TAS5755MDFDR datasheet(69/76 Pages) TI1

69 / 76 page

TAS5755M

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SLOS982 – AUGUST 2017

Product Folder Links: TAS5755M

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11 Power Supply Recommendations

The TAS5755M requires two power supplies; a low voltage 3.3 V nominal for the pins DVDD, AVDD, and

DRVDD and a high power supply, 8 V to 24 V for the pin PVDD. There is no requirement for power up

sequencing of low and high power supplies, however is recommended to put the PDN pin to low before removing

the low voltage power supplies in order to protect the outputs.

11.1 DVDD and AVDD Supplies

The AVDD Supply is used to power the analog internal circuit of the device, and needs a well regulated and

filtered 3.3-V supply voltage. The DVDD Supply is used to power the digital circuitry. DVDD needs a well

regulated and filtered 3.3-V supply voltage.

11.2 PVDD Power Supply

The TAS5755M class-D audio amplifier requires adequate power supply decoupling to ensure the output total

harmonic distortion (THD) and noise is as low as possible. A good low equivalent-series-resistance (ESR)

ceramic capacitor, typically 1 µF, placed as close as possible to the device PVDD leads works best. For filtering

lower frequency noise signals, a 10 µF or greater capacitor placed near the audio power amplifier is

recommended.

12 Layout

12.1 Layout Guidelines

Class-D switching edges are fast and switched currents are high so it is necessary to take care when planning

the layout of the printed circuit board. The following suggestions will help to meet audio, thermal and EMC

requirements.

•

TAS5755M uses the PCB for heat sinking therefore the PowerPAD needs to be soldered to the PCB and

adequate copper area and copper vias connecting the top, bottom and internal layers must be used.

•

Decoupling capacitors: the high-frequency decoupling capacitors must be placed as close to the supply pins

as possible; on the TAS5755M a 1-µF high-quality ceramic capacitor is used. Large (10 μF or greater) bulk

power supply decoupling capacitors must be placed near the TAS5755M on the PVDD supplies.

•

Keep the current loop from each of the outputs through the output inductor and the small filter cap and back

to GND as small and tight as possible. The size of this current loop determines its effectiveness as an

antenna.

•

Grounding: A big common GND plane is recommended. The PVDD decoupling capacitors must connect to

GND. The TAS5755M PowerPAD must be connected to GND.

•

Output filter: remember to select inductors that can handle the high short circuit current of the device. The LC

filter must be placed close to the outputs.

The EVM product folder (TAS5755EVM) and User’s Guide (SLOU481) available on www.ti.com show schematic,

bill of material, gerber files, and more detailed layout plots.

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