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Working with the TAS5615 amplifier

Lorena Ricon
Prodigy 140 points
Other Parts Discussed in Thread: TAS5615

Hello!

I am testing the TAS5615 evaluation board, but I have several problems. Firs of all, this are the characteristics of the test:

-Single ended input, 400mV peak to peak (from a PC)

-PBTL output, join A-C (right, left +) and B-D outputs (right, left -)

-40V, 10A laboratory power supply

-11ohm load (tried also with 8ohm)

The first time I tested it, I damaged the device. I think it was because the audio input was too high (maybe 2Vpp or more). Then I replace the Amplifier inthe evaluation board. Now, I am much careful with the amplitude of the input signal. The situation now is that, I turn on the power with the reset ON and then turn the reset OFF. It is supposed that the READY led must turn ON, but instead, the SD led turn ON. OK, I ignore it (maybe I shouldn't) and turn the audio ON. And nothing happens. Well, almost, there is no sound, but the SD led is still ON. With the sound ON, I reset the amplifier and the SD led turn off, but there is no sound.

I don´t know what I am doing wrong, could anybody help me please?

Thank you very much in advance.

  • 0
    TI__Genius 11680 points

    Hi, Lorena,

    The device can take up to a maximum of 7V of voltage swing, so 2Vpp should not have damaged it. Have you made sure to change the mode to PBTL via the two switches next to the heatsink? What are you doing with the inputs? Only the top channel (A and B) runs during PBTL.

    - Nate

  • 0 in reply to Nate
    Prodigy 140 points

    Hi Nate,

    The switches are in PBTL mode and I am using only the A-B inputs (in fact, only A because it is a SE signal).

    About the maximum voltage swing, it is true that the device can support  up to 7V but, in the evaluation board datasheet (page 3) says the input must be "standard 1 VRMS".

    Anyway, I don't undestand why I the amplifier does not work. Anymore ideas?

    Thank you in advance,

    Lorena

     

  • 0 in reply to Lorena Ricon
    TI__Genius 11680 points

    Lorena,

    Have you checked to see if the output is switching on the IC side of the inductor? If you have an oscilloscope, you can check it out that way, or you can use a multimeter. If you use the mutlimeter, you should measure a DC level of 1/2 your voltage rail, or in this case 20V.

    - Nate

  • 0 in reply to Nate
    TI__Guru**** 189401 points

    Lorena,

    Did you get this problem sorted out?

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 140 points

    Morning!

    Yes, I think we find the problem.

    We discover that, when we turn off the power supply, there is a remaining voltage of 3V. If we turn on the power while there is still this remaining voltage, the source become in OVP mode and turn himself off. And the device starts to behave in an odd mode until we let it rest a couple of hours.

    So, there is a problem with the 1mF capacitors when we start the device. It is necessary that this capacitors are uncharged when the power supply turn on, or the behaviour of the system is unpredictable.

    Thank you for the help,

    Regards,

    Lorena