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TPA2026D2 power issues

or sam
Expert 2020 points
Other Parts Discussed in Thread: TPA2026D2

Hi

In the data sheet it is writen that the amp can provide 3.2W from each port.

I am using its EVM and connecting the vdd to power supply that is set on 5V and connect 8ohm 5W speaker.. 

Using the EVM software (TPA2026D2 interface) I increase the all gain bars to max and I see  that the  current from the supplier is only 10mA.

neglecting the losses inside the TPA2026D2 the power is around 0.05W this can explain the very weak sound I get from my speaker but I cant understand why I cant make it louder.

when connecting one output to one input I see 16mA and louder sound but still very far from 3W.

what am I doing wrong? why cant I get 3W from this component.

am I measuring something wrong?

Regards,

  • 0
    TI__Guru**** 189399 points
    Hi,

    Did you take the amplifier out of shutdown mode in the GUI?

    -d2
  • 0 in reply to Don Dapkus
    Expert 2020 points

    Hi

    thanks for the answer,

    Of course I did, otherwise the gain bars would not have change the loudness level and no sound would have come out from the speakers.

    There was a sound but it was very weak.

    all of this happened when connecting it to my phone jacket and connecting it to 5W 8ohm speaker.

    I expected the sound to be louder then my phone speaker but it wasnt. do you also think that connecting the EVM to phone jacket with this speaker should give louder sound?

    in the data sheet p.4 I see that max Idd is ~5mA so something doesnt make sense 5V*5mA cant give 3W and if the component cant take 3W from power supply how can it deliver something like it?

    something doesnt make  sense I am probably missing something please en-light me.

    thanks again 

  • 0 in reply to or sam
    TI__Guru**** 189399 points

    Hi,

    That's odd. It definitely seems like the device is still in shutdown mode or something - that's why you only measure 5 mA of supply current.

    I have asked my colleague to work further with you on this issue.

    Let us know if you have figured it out in the meanwhile.

    -d2

  • 0
    TI__Intellectual 2285 points

    Hi Sam,

    Power the EVM with an external power supply:  VDD (J8) and GND (J7) banana jacks. Make sure JP1 is removed in this case because this is the jumper which permit the USB to power the EVM.

    So Make sure only one power source is used. Connecting two power sources will cause damage to the device and the supply.

    On the GUI:

    Uncheck and Check left Enable, Right Enable to enable the channels

    Check and uncheck the Shutdown mode (see below)

    Uncheck the "limiter on"

    To read the I2C and be sure that you enable the channel and turn off the shutdown, Click on refresh and read the I2C status.

    This will permit you to drive 3W output power with a 4 Ohm load at 5V 

    With an 8 Ohm load, you the part can drive up to ~1.7 W @ 10THD+N

    Regards,

    Mohamed