TAS5822MDCPR datasheet(75/90 Pages) TI

75 / 90 page

3. Peak current due to Max output power. Ignore the ripple current flow through capacitor.

Load

spea

power

output

peak

Power

Output

Max

ker_

2 u

(2)

Same PVDD and switching frequency, larger inductance means smaller idle current for lower power dissipation.

It's suggested that inductor's saturation current Isat, is larger than the amplifier's peak current during power-up

and playing audio. In addition, the effective inductance at the peak current is required to be at least 80% of the

inductance value in LC filter recommendation to meet datasheet specifications.

Table 8-3. LC filter recommendation

Switching Frequency (kHz)

Modulation Scheme

Recommended Minimum Inductance (uH) for LC filter

design

1024

1SPW

3.3 µH (or larger) + Capacitor (0.22uF~0.68uF)

768

4.7 µH (or larger) + Capacitor (0.22uF~0.68uF)

384 or 480

10 µH (or larger) +Capacitor (0.22uF~0.68uF)

384~1024

8.2uH (or Larger) +Capacitor (0.22uF~0.68uF)

8.2.2.2.3 Power Supply Decoupling

To ensure high efficiency, low THD, and high PSRR, proper power supply decoupling is necessary. Noise

transients on the power supply lines are short duration voltage spikes. These spikes can contain frequency

components that extend into the hundreds of megahertz. The power supply input must be decoupled with some

good quality, low ESL, Low ESR capacitors larger than 22 µF. These capacitors bypasses low frequency noise to

the ground plane. For high frequency decoupling, place 1-µF or 0.1-µF capacitors as close as possible to the

PVDD pins of the device.

8.2.2.2.4 Output EMI Filtering

The TAS5822M device is often used with a low-pass filter, which is used to filter out the carrier frequency of the

PWM modulated output. This filter is frequently referred to as the L-C Filter, due to the presence of an inductive

element L and a capacitive element C to make up the 2-pole filter.

The L-C filter removes the carrier frequency, reducing electromagnetic emissions and smoothing the current

waveform which is drawn from the power supply. The presence and size of the L-C filter is determined by several

system level constraints. In some low-power use cases that have no other circuits which are sensitive to EMI, a

simple ferrite bead or a ferrite bead plus a capacitor can replace the tradition large inductor and capacitor that

are commonly used. In other high-power applications, large toroid inductors are required for maximum power

and film capacitors can be used due to audio characteristics. Refer to the application report Class-D LC Filter

Design (SLOA119) for a detailed description on the proper component selection and design of an L-C filter

based upon the desired load and response.

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TAS5822M

SLASEV8 – DECEMBER 2020

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