TAS5822MDCPR datasheet(74/90 Pages) TI

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bootstrapping the A channel. Similarly, connect another 0.47-µF capacitor between the OUT_B and BST_B pins

for the B channel inverting output.

8.2.2.2.2 Inductor Selections

It is required that the peak current is smaller than the OCP (Over current protection) value which is 7A (Typical) ,

there are 3 cases which cause high peak current flow through inductor.

1. During power up (idle state, no audio input), the duty cycle increases from 0 to θ. There has a start-up current

which flow through inductor to set up the common mode voltage (PVDD×θ).

Note

θ = 0.5 (BD Modulation), 0.14 (1SPW Modulation), 0.14 (Hybrid Modulation)

Start-up Current shows the start-up current related to different Fsw, PVDD, Inductance and different PWM

modulation scheme. Start-up current should within device's OCETHRES.

Table 8-2. Start-up Current

Modulation

Scheme

PVDD (V)

FSW ((kHz))

LC filter

Startup Peak Current (A)

13.5

384

4.7 µH + 0.68 µF

2.88

10 µH + 0.68 µF

768

4.7 µH + 0.68 µF

2.64

10 µH + 0.68 µF

1.84

384

4.7 µH + 0.68 µF

3.84

10 µH + 0.68 µF

2.64

768

4.7 µH + 0.68 µF

3.52

10 µH + 0.68 µF

2.4

384

4.7 µH + 0.68 µF

5.4

10 µH + 0.68 µF

3.76

768

4.7 µH + 0.68 µF

10 µH + 0.68 µF

3.12

1SPW

13.5

384

4.7 µH + 0.68 µF

1.28

10 µH + 0.68 µF

0.96

768

4.7 µH + 0.68 µF

1.12

10 µH + 0.68 µF

0.72

384

4.7 µH + 0.68 µF

1.84

10 µH + 0.68 µF

1.2

768

4.7 µH + 0.68 µF

1.52

10 µH + 0.68 µF

1.04

384

4.7 µH + 0.68 µF

2.6

10 µH + 0.68 µF

1.6

768

4.7 µH + 0.68 µF

2.4

10 µH + 0.68 µF

1.36

Figure 8-3 and Figure 8-4 shows how modulation scheme affect the start-up current. OUTP_PWM is Class D

amplifier's PWM output, OUTP_FILTER is the common mode voltage on the capacitor of LC filter.

2. During music playing, some audio burst signal (high frequency) with very hard PVDD clipping will cause

PWM duty cycle increase dramatically. This is the worst case and it rarely happens.

)

(

PVDD

clipping

peak

(1)

TAS5822M

SLASEV8 – DECEMBER 2020

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