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TAS5756M: Overheating

Part Number: TAS5756M
Other Parts Discussed in Thread: , TAS5825MEVM, TAS5766M

Hello Team,

We are using TAS5756M on a custom board and I think that it is almost overheating.

I am using audio amplifier in BTL mode with 25W 4Ohms speakers. There is a heatsink on the bottom of PCB, layout is good, but there is still problem. When I am measuring the thermal on the top of IC, it shows over 100°C. I also tried on the TAS5756MDCAEVM, but there is the same situation.

So does anyone some ideas?

In the datasheet, 'Power at 10% THD+N vs PVDD' shows that it couldn't reach more than 17W power. Is this right?

At the moment the power supply for ICs is 14.4V

Regards,

Petar

  • Hi Petar,

    Yes.

    The continuous power output of any amplifier is determined by the thermal performance of the amplifier as well as limitations placed on it by the system around it, such as the PCB configuration and the ambient operating temperature.

    If I remember correctly, TAS5756MDCAEVM is a 4-layer board and uses 1 oz copper. If 2 oz copper is used, the continuous output power should be higher. Most of our new EVMs use 2 oz copper, like TAS5825MEVM.

    Andy

  • Hello Andy,

    Thank you for the quick replay.

    I am also used 1 oz cooper board. If I could have a "green light" I will make it at least 1.5 oz copper, because the price is also important.

    Anyway if we accept that cont output power is determined by the thermal performance. Why, when I limit the volume to 17W per channel, it also get above 100°C. Layout is get from the TAS5756MDCAEVM so it could be good.

    Do you have any suggestion except copper thickness and layout?

    Regards,

    Petar

  • Hi Petar,

    I'm afraid no.

    Remember to take a look at Section 11.1.3 Optimizing Thermal Performance of TAS5756M datasheet. There are some useful tips there.

    Also, take a look at Section 11.2 Layout Example of TAS5766M datasheet. You will see quite a lots of details about the layout. TAS5766M is pin to pin compatible with TAS5756M, so the same layout guidelines can be shared.

    Andy

  • Hi Andy,

    I had already looked at those sections and I think that I make my layout referent to those requirements.

    Anyway, thank you for the suggestions.

    Regards,

    Petar

  • Let us know if you have other questions.