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TAS5630PHD2EVM

Veera Akula
Intellectual 410 points

Other Parts Discussed in Thread: TAS5630PHD2EVM, OPA1632, TAS5630

Hi,

We have received new TAS5630PHD2EVM and started working on it.

We configured the EVM in PBTL mode and connected to a Loudspeaker (60W, 16 ohm) with cable (AWG16) length of 30meters.

We kept the EVM in Reset state and applied 35V DC and then we made Reset high, Ready LED cameup and then we applied differential audio signal at J24. It worked fine, we had listen audio from the Loudspeaker.

Now we Reset the EVM, increased the Power supply to 40V but now the EVM came up in SHUTDOWN (LED is ON) mode, we made RESET high but still it is in SHUTDOWN mode and READY LED is OFF, OTW1, OTW2 and CLIP LEDs OFF.

We Reset the EVM, swicth off the power supply, remove the load, and apply 35V DC but still it is coming up in SHUTDOWN mode and it is not responding to RESET.

We meausre the PVDD/VDD it is 12V so its not the problem of UnderVoltage, its not the problem of OverTemp because OTW1&2 LEDs OFF, CLIP LED OFF. Its not because of OverLoad also we have not connected any Load.

SHUTDOWN occurs due to UnderVolatage, OverLoad, OverTemp or Pin to Pin Short Circuit (PPSC) protection.

So is it because of PPSC? We checked for short between OUT_X and GND and PVDD. The resistance between OUT_A/OUT_C/OUT_D and GND is 500 ohm but OUT_B to GND it is only 20 ohm. Is it because of this. What could be the reason for this.

The moment we powerup the EVM SHUTDOWN LED ON and RESET LED ON. If we remove RESET, RESET LED OFF but SHUTDOWN LED remains ON.

Could you please let us know what should be the problem and how to overcome it?

Regards,

Veera.

 

  • 0
    Intellectual 410 points

    Dear Steve,

    Coud you please respond to this TAS5630PHD2EVM problem.

    Regards,

    Veera.

     

  • 0
    Intellectual 410 points

    Hi,

    We have replaced the TAS5630 chip, it is working fine at 30V. But clipping is occuring. What should be the max signal amplitude at OPAMP (OPA1632) input to avoid clipping at PVDD=30V?

    Regards,

    Veera.

  • 0 in reply to Veera Akula
    TI__Guru**** 189401 points

    Hi, Veera,

    Steve is on the road right now, so it's going to be later this week until he can get back to you.

    In the meanwhile, you might want to study the d/s and EVM users guide. All the information you need to figure this out is contained there.

    -d2

  • 0 in reply to Veera Akula
    TI__Mastermind 18510 points

    Veera, I am able to review this now.  I have a question about the failure of the first device and some advice about EVM gain.

    - When you powered up the EVM with PVDD 40V, was the audio input still playing?  I do not see that it was turned off.

    The recommended power/start up sequence for TAS5630 is this.

    1) Connect the audio source to the inputs with the audio source stopped or turned off.

    2) Apply VDD, GVDD and PVDD.

    3) Release /RESET

    4) Apply audio to the inputs when READY is high.

    Bullet (3) does not include plugging in an input, because this can introduce transients that can drive TAS5630 inputs outside the Absolute Maximum range.  Instead, stop the audio source and restart it when READY is high.

    Gain of the EVM is 7dB in the OPA1632 circuit and 24dB in TAS5630, 31dB total.  So for 30V PVDD the peak input signal must be less than about 820mV to avoid clipping.  As Don mentioned, the users guide includes the schematic information for calculating this.

    Best regards,

    Steve.

  • 0 in reply to SteveCrump
    Intellectual 410 points

    Dear Steve,

    Thank you very much for the information. We are following the same sequence. We will try by applying 40V DC with new chip and let you know the results.

    About the Gain, TAS5630 datasheet is specified as 23dB but you mentioned it as 24dB. Could you please clarify this doubt?

    Regards,

    Veera.

  • 0 in reply to Veera Akula
    TI__Mastermind 18510 points

    The extra dB allows for gain variation in TAS5630, to help avoid clipping.  You will want to check this to make sure your signals are aligned correctly.  I think you see how to calculate this now, using information from the data sheet and users guide.

    Regards,

    Steve.

  • 0 in reply to SteveCrump
    Intellectual 410 points

    Dear Steve,

    Thank you for the info. Does the gain vary based on PVDD or it is a constant parameter.

    Regards,

    Veera.

  • 0 in reply to Veera Akula
    TI__Mastermind 18510 points

    Veera, the best answer is PSRR information in the data sheet.

    Best regards,

    Steve.

  • 0 in reply to SteveCrump
    Intellectual 410 points

    Thank you Steve. TAS5630 datasheet is specified PSRR as 80dB. So 20V change in PVDD will result in 2mV change in output. Its very negligible. Is it correct.

    Regards,

    Veera.