TAS6584-Q1: Please review the schematic

Chase,

1.  pin 14/15, pin 19 are not referenced to PLL_GND.  please change it to referenced to GND.

2.  remove PLL_GND and GND connection

3. how does the AMP_ON net is controlled?  please use a 3.3Kohm pull down resistor for this PD pin, to make sure there is a fixed voltage applied.

4. Output LC filter need to be 10uH+1uF+0.22uH+0.1uF.  and PWM frequency should use 480KHz.

I notice the PVDD is 12V only, then why use TAS6584 here? this device is a high power device intended to be >40V level, also much higher cost.  for 12V level, TAS6424E is best choice.

Dylan

Dear Dylan,

Thank you for your support.

Answer 1,2,3 : applied to the schematic.

Answer 4 : TAS6584-Q1 supports 384-kHz to 2.1-MHz configurable output switching frequency (datasheet says)

And 2MHz frequency is referenced in SLOA337 document. Is there any reason to apply 480KHz?

(my customer says that they have many choices for the price choosing inductor.)

Finally, They already know that TAS6424E is cheaper but they should use TAS6584 because of the space of PCB.

Please check again about answer 4.

Best regards,

Chase

Dear Dylan,

Thank you for your support.

My customer said that they use 4 speakers which impedance is 40 ohm each (maximum power is 20W each). So they think that they consider figure 9-1, not figure 9-2. There is not a reference about using schottky diodes in figure 9-1.

Is it necessary to apply schottky diodes in this case?

Best regards,

Chase

Dear Dylan

We are a company that is designing using TAS6584-Q1.
Since the schedule is tight, I am contacting you directly for cross-checking.

If you use 4-channel 4-ohm speakers using BTL mode instead of PBTL mode, you can refer to the datasheet Figure 9-1, and Shottky Diode seems unnecessary.

Is that correct?

If you have any other advice on the circuit, please share.

Thank you.

Hi KISUK

KISUK LEE said:

If you use 4-channel 4-ohm speakers using BTL mode instead of PBTL mode, you can refer to the datasheet Figure 9-1, and Shottky Diode seems unnecessary.

Is that correct?

Yes, that is correct.

And for your previous 40ohm load, PBTL also won't be helpful. Because PBTL only could provide larger current, used under very low resistance load like 2ohm/1ohm. PBTL can't provide large voltage, which is PVDD decided. Your 40ohm and 20W using, requires large voltage, not current.

I just saw the 40ohm text.
It's not 40ohm, it's 4ohm.

I clearly conveyed the text as 4ohm, but I think the text was misconstrued in the middle.
Your answer was helpful. Thank you.
Merry Christmas.