TAS5805M: Request review a schematic.

David Kim2

Genius 3305 points

Part Number: TAS5805M

Tool/software:

Designed a schematic with the specifications below.
Can you review the schematic?

PVDD = 12V
DVDD = 1.8V
The signals related to I2C (I2C_SDA, I2C_SCL) use the level shift (3.3V – 1.8V) circuit as the SOC side uses 3V,

Fsw = 768kHz

TAS5805M_schematics_20250428.pdf

Thanks

4 months ago

0 Sydney Northcutt 4 months ago

TI__Mastermind 18020 points

Hello,

Thanks for reaching out.

Overall the routing of all the components looks good, but I recommend changing some of the component values.

- The bootstrap caps should be 0.22 uF
- Use 0.68 uF caps on the output LC filter
- For proper high frequency decoupling on the power supply (PVDD) I would use 1 uF and/or .1 uF rather than 104 pF or 226 pF
- On AVDD and VR_VDD I would use 1 uF caps
- ADR should have a pull up based on the below table

- PDN should have a pull up resistor

Regards,
Sydney Northcutt

0 David Kim2 4 months ago in reply to Sydney Northcutt

Genius 3305 points

Thanks for your support.

I have a additional question.

For proper high frequency decoupling on the power supply (PVDD) I would use 1 uF and/or .1 uF rather than 104 pF or 226 pF

=>Even looking at the data sheet, 22uF is recommended. Please check again.

Thanks

0 Sydney Northcutt 4 months ago in reply to David Kim2

TI__Mastermind 18020 points

Hello,

Please refer to the below excerpt from the datasheet:

If you can use the recommended 0.1 uF, 22 uF, and 390 uF, that is ideal.

Regards,
Sydney Northcutt

0 David Kim2 4 months ago in reply to Sydney Northcutt

Genius 3305 points

Thanks for your response.

I have a additional question.

Which one is more advantageous in terms of audio quality, 4.7uH + 0.68uF or 10uH + 0.68uH for the output filter?

Thanks

0 Sydney Northcutt 4 months ago in reply to David Kim2

TI__Mastermind 18020 points

Hello,

Sure happy to support.

I recommend using 10 uF here. Smaller inductors are typically used for lower costs and smaller size, but they can cause issuing including over current, larger ripple, etc. We've also validated this part using a 10 uF inductor.

Regards,
Sydney Northcutt

0 David Kim2 4 months ago in reply to Sydney Northcutt

Genius 3305 points

Thanks for your support.

Does inductor capacity also affect audio quality?
Which inductor would be better for audio quality if it affected?

Thanks

0 Sydney Northcutt 4 months ago in reply to David Kim2

TI__Mastermind 18020 points

Hi David,

It can. A larger inductor is also generally recommended for this purpose but it is dependent on the specific inductor chosen so I recommend testing between the two to see if one gets you a more ideal performance for your application.

Regards,
Sydney Northcutt

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TAS5805M: Request review a schematic.