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TAS5630B: TAS5630B application problem

aggil liang
Expert 2660 points
Part Number: TAS5630B
Other Parts Discussed in Thread: TPA3255, TAS5630

Hi, 

       when use TAS5630B to design a PBTL power subwoofer, we find a problem as below picture showing when rise the input signal slowly. The schematic is as the attachment , pls. help to check the reason. thx

  • 0 in reply to aggil liang
    TI__Guru 63710 points

    Aggil,

    Thanks for your post. Please let me know the following information:

    1. PVDD input voltage.

    2. Output Load.

    3. Output power level target?

    4. At what corresponding input voltage and output voltage range does the amplifier work and at what level does the output become unusual?

    5. Have you monitored the CLIP pin during this testing?

    Regards.

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 30 points
    Adam,
    Hello,the answer of Aggil :
    1.＋50V supply.
    2.The same output with no load or 4Ohm load.
    3.35VAC output with 4Ohm load.
    4.The vidio, it worked unusual at 5VAC output with balance input.
    5.We haven't.

    Regards.
    Bill
  • 0 in reply to BillAJ
    TI__Guru 63710 points

    Bill,

    Your settings and voltages seem correct so far.

    What power supply are you using? What current can it supply?

    Please repeat this test while monitoring the CLIP pin.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Expert 2660 points

    Hi Adam

          customer use the switch AC/DC power supply , and this power can also driver TPA3255. So I think the output current is enough. 

        You can get the waveform of clip pin at below video, and pls. help to solve the problem , it is urgent , thx 

  • 0 in reply to aggil liang
    TI__Guru 63710 points
    Aggil,

    According to your previous post, the strange output behavior happens at only 5VAC output?

    The CLIP pin is also going low to show that there is an issue. Can the customer try a bench power supply to verify that the TAS5630 has enough current to operate?

    Please ask the customer to check the input voltage at R204 and R205 closest to the device to make sure their input is not clipping and causing this.

    Regards,
    -Adam
  • 0 in reply to Adam Sidelsky
    Expert 2660 points
    Hi Adam,
    thanks ,customer have solve the problem. the reason is the input signal is not balance.