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tas5631
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  • Forum Post: TAS5631 PWM input

    Laurentiu Chitu
    Hello! I have one TAS5631 and i don't want to drive with digital audio processor (TAS5518). I want to use this power circuit in stereo mode. Exist a good schematics (not processor) for convert analog audio signal to pwm signal for this TAS5631? Many thanks .
    on Sep 20, 2009

  • Forum Post: Re: Can a TAS5631DKD2EVM do DC?

    SteveCrump
    Leandra, I will check this and get back to you shortly. I think there is no reason against sub-Hz operation, but let me be sure. Best regards, Steve.
    on Jul 7, 2010

  • Forum Post: Re: Can a TAS5631DKD2EVM do DC?

    SteveCrump
    Leandra, TAS5631 was designed for audio AC operation rather than DC, so we are not certain of all the conditions. However, if the outputs are used BTL and the device is brought to its operating point at 50% duty cycle before a DC or sub-Hz input is applied, we believe this will be safe. Please keep...
    on Jul 9, 2010

  • Forum Post: Re: Can a TAS5631DKD2EVM do DC?

    SteveCrump
    Leandra, thank you for letting me know. I am pleased to hear that the system is working for you. The MUTE switch on Input USB Board 2 controls a dedicated hardware path to the /MUTE pin on TAS5631. As you suspected, there is no software path to automate it on turn-on. Best regards, Steve.
    on Sep 27, 2010

  • Forum Post: Question regarding DSP coefficients when using TAS3308 (w/ TAS5631)

    Terry Jendon
    Hello I have a customer considering using a Texas Instrument TAS3308 and TAS5631 and had some inquiry below: The approach is to use 4 channels of the 10 analog audio inputs. This is to provide a pair of instruments, a microphone and an additional option input. The audio inputs are sequentially multplexed...
    on Oct 11, 2010

  • Forum Post: Re: TAS5631 in PBTL mode

    SteveCrump
    Dominque, TAS5631 is not specified for 8ohm loads in PBTL simply because PBTL is expected to be used for higher power into lower impedances. Generally BTL operation is enough with 8ohm loads. But TAS5631 certainly will drive 8ohm loads in PBTL mode. Best regards, Steve.
    on Oct 12, 2010

  • Forum Post: TAS5630 /CLIP signal output

    Tomasz J. Chumiecki
    Hi All, “The CLIP signal indicates that the output is approaching clipping. The signal can be used to either an audio volume decrease or intelligent power supply controlling a low and a high rail...” That’s all I found about /CLIP signal in the TAS5630 datasheet … I would...
    on Dec 6, 2010

  • Forum Post: tas5631 current limit?

    geert de vries
    Hi, Currently we are evaluating a new design incorporating the TAS5631. We use the DKD version, 2 x BTL at 48V. AD modulation scheme At 3.5 Ohms load, some 2dB before clipping, spikes apear on the output signal. This starts at the negative side first. It seems the output current limit...
    on Jan 13, 2011

  • Forum Post: Re: tas5631 current limit?

    SteveCrump
    Geert, grounding the heatsink is vital. The heat slug conducts substrate currents which must be returned to ground. The bottom surface of our heatsink is machined after anodizing to provide a good electrical as well as thermal contact, and we use thermal compound rather than a silicon pad to complete...
    on Jan 30, 2011

  • Forum Post: Re: tas5631 current limit?

    SteveCrump
    Geert, please note one other thing. TAS5631 data sheet SLES221C, page 4, Recommended Operating Conditions, specifies minimum load impedance of 3.5ohms for BTL operation. This is not a load rating, it is true impedance. Generally, a 3.5ohm speaker load will have regions in which its impedance falls below...
    on Jan 30, 2011

  • Forum Post: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Hi Guys, I have significant output noise issue with TAS5631PHD2EVM. First of all I modified the TAS5518 register 0x04 with the value 0x60 to have the TAS5518 automatic mute function disabled. With this configuration I measured what is on TAS5631PHD2EVM output with no input signal and I am really shocked...
    on Apr 14, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    SteveCrump
    Tomasz, I think there is a lot of noise outside the audio band in your scope graphs. A couple of the repetitive features appear to have periods corresponding to about 71 and 51 kHz. Do your measurements limit the bandwidth to 20kHz? If not they are including frequencies that should be eliminated....
    on Apr 14, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Hi Steve, You are right - there is a lot of noise outside of the audio band in the signal I measured... but I can measure them on the output of EVB - after the filter... I do the measurements with FLUKE scopemeter without the bandwidth limitation. I performed similar measurements on my TAS5630 module...
    on Apr 14, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    I guess the high frequency you can see on the second scope screenshot comes probably from the main modulating switching frequency - around 350kHz? could it be so?
    on Apr 14, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Hi Don, Today I've found some time and performed the measurement on my TAS5631PHD2EVM one more time. I even used provided on the TI webside TAS5518 configuration: X04 60 - Automute disabled Xd9 00 00 00 48 - 0 dB Master Volume The results I've got this time are exactly this same like last time...
    on May 5, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Don, Like the last time, the measurement is taken across the outputs with FLUKE scopemeter 199C with differential / galvanic isolated inputs and original 10:1 FLUKE probe. The EVM was only connected to linear regulated laboratory power supply (50V/5A) and the original USB input board. I used TOSLINK...
    on May 5, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Don, I took a look also on the PWM signal before the output filter and I can see, that also with really low audio signal, or even with pure zeros send over TOSLINK, the edges of the PWM signal are really jittered - this is what I can see after the output signal as the voltage noise. Look how does...
    on May 5, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Hi, Could anyone explain me the issue ... Is my board defected? Do I measure something wrongly? I do not think so, the chip is so poor ... Thanks, Tomasz
    on May 10, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Steve, OK, thanks for your replay. It would be nice if you check the issue on other EVM. There is no need now to replace my EVM even if there is something wrong with it - the board is not so complex, in worst case I could repair it myself (if it is really broken). Next week and the week after I am...
    on May 11, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Hi Guys, any chance to clarify the issue? Regards, Tomasz
    on Jun 6, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    Hi Steve, Thanks a lot for your replay. At first, your scope screen shot is slightly different to what I measured and it is also one of very interesting behavior I observed. I guess you made your measurement using resistive dummy load instead of the speaker. If you would load the amplifier output with...
    on Jun 11, 2011

  • Forum Post: Re: TAS5631PHD2EVM output noise issue

    Tomasz J. Chumiecki
    I also tried to look directly on the PWM signal and it shows huge jitter. Look on the scope measurements I made directly on the TAS5631 outputs: It would be interesting to made an FFT analyze of the jitter to see what is going on there. I guess the jitter shows this same high frequency signal I...
    on Jun 11, 2011

  • Forum Post: input signal for TAS5631

    Xiaoka Xu
    Hi, I want to design a new amplifier using TAS5631, Can I use TI's DSP to generate the PWM signal and input to TAS5631? Is it possible? I checked the TAS5631EVM, and TAS5518 was used to generate the PWM singal. Is it possible to use TI's DSP instead of TAS5518? Thanks and have a good day...
    on Jul 22, 2011

  • Forum Post: input signal for TAS5631

    Xiaoka Xu
    Hi, I want to design a new amplifier using TAS5631, Can I use TI's DSP to generate the PWM signal and input to TAS5631? Is it possible? I checked the TAS5631EVM, and TAS5518 was used to generate the PWM singal. Is it possible to use TI's DSP instead of TAS5518? Thanks and have a good day...
    on Jul 22, 2011

  • Forum Post: Re: TAS5631DKD2EVM and Input-USB Board 2 first test

    Christian Ngamy
    Thank you for Your answer, I still don't understand something: for the general test condition, i read in the TAS5631 manual (page 4) that we need a 12 V DC supply voltage in additional to the 50 V (RECOMMENDED OPERATING CONDITION) but this is not mentioned in the TAS5631DKD2EVM manual (we just...
    on Apr 1, 2012
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