This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS2562: I would like to know about TAS2562 over current error and the sound loud

Part Number: TAS2562

Dear Expert,

I would like to know the specifications about TAS2562 
Please teach us about TAS2562 of Audio Amplifier.

We designed our equipment using TAS2562 for Audio spearker.

I have a speaker connected to the TAS2562 and am outputting sound.
Normally, it works fine. However, when I play loud sound, the limit function of the TAS2562 is activated and no sound is output from the speakers.
If I turn down the sound on the sound source side, there is no problem.

The cause of the limit function can be found in the following table.
Lutched interrupt Readback 0 Field Descriptions
Bit1=1 which means interrupt due to over current error.
I think TAS2562 work the protect and cause by the sound turned up too loud.
TAS2562 work the function. No sound was produced due to over current being detected.

1. Is it correct? an over current was generated by making the sound louder?
2. In which part of TAS2562 did the over current occur?
3. Where terminal (pin) or what part of the TAS2562 caused the over current?
4. Power Control Field Description
In Bit 3, ISNS_PD is default 1 and I-sensen is powered down, but does the over current function?
5. External PVDD supplies +10V from outside to make the sound louder.
5. When PVDD is connected externally, the application note is wrote that +10V is connected to the VBST pin, is this correct?
6. The datasheet page 49 of TAS2562,
When driving the Class-D amplifier using an external supply through the PVDD pin, the boost should be disabled and the VBST pin can be left floating.
Do not drive an external voltage on the VBST pin.

Which is sorrect No.5 or No.6?

7. When PVDD coneced the External PVDD supplies +10V, VBST connected External PVDD then the TAS2562 fail or detected over current.

8. I would like to know, how to I could make the sound as loud as possible useing to connect PVDD +10V external.
for exsample, there any register where I can adjust it?


  • Hi Taniguchi,

    I'm adding some comments on each of the questions below:

    1. That's correct, seems the device is protecting itself due to overcurrent at higher output power.
    2. Overcurrent happens at the Class-D output driver.
    3. Overcurrent may happen at either OUT_P or OUT_N.
    4. ISNS and VSNS are not used for overcurrent sensing, these are separate features. Overcurrent protection is always enabled.
    5. External PVDD can be used if integrated 11V boost is low for the output power requirement.
    6. It's OK to drive external voltage to PVDD/VBST as long as the boost is configured as "always off" and "disabled", as described in the app note.
    7. Did you write the required configuration to register 0x33? You should set bits 7-6 to '11' and bit 5 to '0'.

    Have you tested with different speakers or test loads? Perhaps the one you're using is too low impedance causing the device to trigger overcurrent protection?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • Dear Ivan,

    Thank you very much for your quick response.

    We will check the value of register 0x33.

    We will check our peripheral Audio circuit.

    And I would like you to ask our more questions again.

    Sincerely yours,

    Toshi Taniguchi

    Hardwear engineer manager

    Orylab Inc.

  • Hi Taniguchi,

    No problem, let us know if there's any further questions.

    Best regards,
    -Ivan Salazar
    Applications Engineer