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TAS3308 LC-EVM resetting every 16 seconds.

James Hedges
Prodigy 100 points
Other Parts Discussed in Thread: TAS3308

Hi All,

 

I have built the TAS3308 LC EVM into a powered speaker and providing 5V to the EVM to power the board when the usb is not connected.

When the back is on the speaker it seems that after so long when everything gets to temprature that the EVM keeps momentaryly going into reset only for a brief second.

 

If i leave the back off the speaker then the EVM does not go into reset at all!!!!!!

 

Nothing on the EVM feels particularly warm or like it is over heating.

 

Any ideas why it is doing this and what is sensing the heat?

 

Also with the back on the speaker and powering with USB aswell as the 5V i am supplying, the EVM does not go into reset!!!!

 

All a littlte bit confusing.....

 

Should i try feeding in 3.3v instead of 5 and bypassing the VR1 when no USB is connected?

 

Thanks for your time :)

 

Jamie

  • 0
    TI__Genius 14545 points

    Jamie,

     

         Please check the power rails with the board as it is and compare it with the board when it's powered via the USB bus. If the EVM board doesn't go into reset by itself (via USB connection and without speakers), you might have a situation in which the powered speaker is sinking to much current, and thus dropping the voltage rail to the TAS3308EVM-LC. I don't understand how removing the plastic backing on the speaker would effect the reset of the board. I would suggest you try to isolate the issue, and see what happens.

     

  • 0 in reply to dabuan
    Prodigy 100 points

    Hi Drew,

     

    I have tested the rails. They remain stable at 5.2VDC with USB connected and dissconected. Will seperate the power supplies later.

     

    Thw back is a big metal heat sink. If i leave the back on the internal cabinet air temperature rise. With the back off just a little bit it seems to be ok, i assuming its ventilation but this makes no sense as when usb is connected it is fine! 

     

    I will keep posting results in the mean time.

  • 0 in reply to James Hedges
    TI__Genius 14545 points

    James Hedges said:
    I have tested the rails. They remain stable at 5.2VDC with USB connected and dissconected.

     

    I hope you mean that the rails are 5.2V DC before the 3.3V LDO that powers the TAS3308. If the TAS3308 power pins see the 5.2V DC, then you are operating the device outside its maximum operating conditons.

     

  • 0 in reply to dabuan
    Prodigy 100 points

    Hi,

     

    Just to end this thread.

     

    problem solved.

     

    applied a heatsink to host PSU regulators and uprated to 1.5A versions. I think current capacity was reduced due to high temprature.

     

    All works well. 

     

    Thanks for all input on this topic.....