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  • TI Thinks Resolved

TAS5806M: Powered at 24V it heats up and turns off

Prodigy 60 points

Replies: 9

Views: 151

Part Number: TAS5806M

Hello everyone.
I tested the TAS5806M powered at 12V and everything works perfectly, but if it is powered at 24V the TAS5806M heats up and immediately goes into protection. What am I doing wrong?

  • Hello Francesco,

    Is your test with a speaker load? You might be violating the minimum speaker load spec for the device, please look at section 7.3 Recommended Operating Conditions in the TAS5806M datasheet.

    Best Regards,

    Luis

  • In reply to Luis Fernandes de Pina:

    Hello Luis,

    Yes, I am using 8 Ω speakers and I have noticed that even without audio and without the speakers it overheats when I go beyond 21V.

    I am attaching a photo of the PCB.

    Thank you.

  • In reply to Francesco Cornacchia:

    Hello Francesco,

    Can you provide a Schematic and layout of your design.

    best regards,

    Luis

  • In reply to Luis Fernandes de Pina:

    Sure.

  • In reply to Francesco Cornacchia:

    Can anyone help me?
    I did other tests and from 21V onwards even without music, in a short time the TAS5806M heats up and goes into protection.
    Below it continues to work perfectly

  • In reply to Francesco Cornacchia:

    Hello Franceso, 

    Looking at the image you provided and the layout images, they appear to be different boards. Can you show the layout for the board you are seeing the overheating issues on. Also have you tested this on multiple PCBs. The soldering job on the board you provided a picture of is not clean, so it could cause issues with the performance of the device.

    Best Regards,

    Luis

  • In reply to Luis Fernandes de Pina:

    Hi Luis, Yes I have tested the operation on multiple PCBs and I have found the same problem on all of them. I am currently testing the PCB of the last photos I sent. I am also attaching the real photo.
    These days I have partially solved the problem by changing the PWM Mode from BD Mode to 1SPW Mode and the Loop Bandwidth from 80KHz to 175KHz. Now it heats much less. Can I do something else to improve the result even more?


    Thanks a lot.

  • In reply to Francesco Cornacchia:

    Hello Francesco,

    The Loop BW, and 1SPW modulation would be the only software/firmware changes that could impact thermal performance. Most of the impact would involve changes to your layout. Looking further at your layout there are several issues that would impact thermal performance.

    • Most of the thermal reliefs should be removed and your grounds should be solid planes, i'm not sure if it's your keepout distance between traces but alot of the grounds you have in your board are restricted or cut off which would negatively impact the thermal flow.
    • You should add vias in your layout in the return path between the pads of the inductor, also consider moving the output capacitors so your output trace loop isn't restricting the ground return path.

    Please see the below image for suggestions on layout/thermal designs. It says for TAS5805/25 but applies for TAS58XX family, you can also see our EVMs for reference.

    Best regards,

    Luis

  • In reply to Luis Fernandes de Pina:

    Ok, thanks for the advice. I'll take a look.

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