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TAS5806MD: IC heats up, even without load

Severin Getzner
Prodigy 210 points
Part Number: TAS5806MD
Other Parts Discussed in Thread: TAS5806M

With my design is possible to play audio, and everything works fine if PVCC is kept betwen 5-8V. Above that voltage the PCB gets warm even when no Speaker is conneted, so something within my circuit must draw too much current. At 7 Volts it is about 0.12 Amps when ideling. I suspect it is the IC but I am not sure. My speaker has a DC resistance of about 3,5Ohm. Accordung to the Datasheet it should be possible to apply about 16V without Problems. Where did I make a Mistake?

  • 0
    TI__Genius 14420 points

    Hello Severin,

    Typically for debugging thermal issues the considerations are the thermal pad, vias, ground plane, copper thickness and PVDD voltage. Just looking at your layout i think you might have too dense a number of vias under the thermal pad which isn't allowing for an easy path to dissipate heat through the copper ground pour. Additionally how many layers is your board. I would recommend looking at the EVM for layout guidance.

    regards,

    Luis

  • 0 in reply to Luis Fernandes de Pina
    Prodigy 210 points

    Hello Luis,

    thanks for your reply. That's true. It seems like I was using too many vias there. For now I could close them with some solder. But I have to say I have a strong feeling that the problem must be somewhere else. Because the idle current gets higher, the higher the applied Voltage on PVDD is. For example at 7 Volts it is 0.12 Amps and at 12V it is about 0.22Amps. I can't imagine that this IC draws so much current when idling and at the same time without loads on the outputs.
    So either it is the fact that I am using the TAS5806MD instead of the TAS5806M (because I couldn't find the TAS5806M on the Internet) or my schematic includes some mistakes. 
    I am looking forward to hear your advice. 

    regards,

    Severin

  • 0 in reply to Severin Getzner
    TI__Genius 9180 points

    Hello Severin,

    Today is public holiday in US, so reply from Luis will be delayed.  Before he come back, may you share the schematic. Also we want know:

    1. is the PVCC supplied to TAS5806 only?

    2. is the 0,12A only for PVCC current . just to make sure the number 0.12 doesn't include DVDD current and other current.

    2. you configure it with PPC GUI?

    Dylan

  • +1 in reply to Dylan Yao
    Prodigy 210 points

    Hello Dylan

    1) PVDD and DVDD ist supplied
    2) yes 0,12A is PVCC only
    3) No, i configured it via an STM32

    I did find the error: the R1-R4  resistors drew too mach current, desoldering those did the trick and didn't decreas the performance overall.