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TAS5760M-Q1: No output of PIN3

Rain Wang
Expert 1380 points
Part Number: TAS5760M-Q1

HI  TI

When the customer is using tas5760, there is no problem with the input signal and power self inspection, but there is no output signal. The AVDD voltage is 12V. The customer has the following questions

1.SPK_ SD (pin \7) always high, is this OK?

2. to make the internal DVDD LDO output voltage, in addition to the AVDD voltage, pull high SPK_ SD, do you still rely on any other signals?

  • 0
    TI__Genius 11300 points

    Hi

    SPK_SD keeps high seems ok.

    if your signal has no output, have you checked the /SPK_FAULT pin?

    does it show any error?

    thanks.

    Jesse

  • 0 in reply to Jesse Ji
    Expert 1380 points

    hi Jesse

    As long as the PVDD is powered on for 12V, no matter the SPK_ Shutdown pull high or pull low, regardless of SPK_ Sequence of shutdown and PvdD, SPK_ Both fault =0.5v~0.7v remain unchanged, neither high nor low.

    After power on the PVDD for 12V, SPK_ Fault voltage will take a few seconds to slowly rise to 0.5v~0.7v, and then remain unchanged.

    Please help to see why？

  • 0 in reply to Rain Wang
    Expert 1380 points

    The two samples are consistent

  • 0 in reply to Jesse Ji
    Expert 1380 points

    hi Jesse

       After the external 3.3V power supply input is added to the DVDD, the problem seems to have been solved, but the sentence marked with a red line in the datasheet means that the dvdd can supply power through the internal LDO. Is it a mistake in the manual or a mistake in understanding the meaning?

  • 0 in reply to Rain Wang
    TI__Genius 11300 points

    Hi Wang

    the LDO is used to provide the voltage for some other portions which need lower voltage than DVDD.

    DVDD will be provide the voltage for this LDO, not use LDO generate the DVDD.

    Also, i found some difference between customer circuit and our recommend schematic.

    if still have any other problem, maybe they can check this difference too.