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TAS6684Q1EVM: TAS6684Q1EVM burn out

Claudio Casagrande
Prodigy 40 points
Part Number: TAS6684Q1EVM
Other Parts Discussed in Thread: LM5123EVM-BST,

Tool/software:

Hi All,

I was working on TAS6684Q1EVM with the purpose to enable Envelope Audio Tracking and connect to a LM5123EVM-BST board.

We made all steps without any issue, we were able to drive LM5123EVM-BST board and see that its output was moving accordingly with played music on the range 14-33V.

Last step was to connect LM5123EVM-BST output to PVDD on TAS6684Q1EVM, we switch off everything, we made connection and as soon as we restart the system, before download any king of configuration the TAS6684Q1 on EVB burned out starting to have a short on PVDD

After that we verified that 3V3 part inside TAS6684Q1 was still alive and able to communicate thought I2C.

what could have happened? Must be said that VBATT was slightly lower that PVDD at startup, if this could a reason for such behavior

Thank You in advance

Claudio

  • 0
    Prodigy 40 points

    Sorry typo:  PVDD was slightly lower than VBAT at startup and not viceversa

  • 0 in reply to Claudio Casagrande
    TI__Expert 5690 points

    Hi Claudio.

    I have some questions on this problem.
    1. The LM5123 EVM board now can work normally? Nothing burns out?
    2. If the PVDD voltage > 45V during its startup?
    You can also take attached reference schematic as a reference.TAS6584 Class-H Reference Design.pdf
    Another point is that do you make sure that the PVDD and GND wire is thick enough. If the wire not too thick, it may lead to big ground noise (the TAS6584 EVM has 4mF E-Cap).

    Now, we more recommend using the combination of LM5125+TAS6684. LM5125 supports parallel connection of multiple devices and flexible adjustment of dead time. Compared with TAS6584, TAS6684 fixes many usage bugs and is easier for customers to use.

    BR.
    Wei Qiu.
  • 0 in reply to Wei Qiu
    Prodigy 40 points

    Hi Wei,

    below answers to your questions:

    1) LM5123 EVM still working properly

    2) I didn't check, because it has been very fast, but its should be something less (few hundreads of mV) of VBAT. VBAT was 14.4V and connected as VBAT to TAS6684EVM and to LM5123 EVM as VIN. VOUT from LM5123 EVM was connected to PVDD of TAS6684 EVM. Switch buttons PD and STDBY were both OFF. Boards got the same GND and wires were big enough for expected peak current

    I hope this can help you to understand what happened

    Claudio

  • 0 in reply to Claudio Casagrande
    TI__Expert 5690 points

    Hi Claudio.

    You mean that the TAS6684 is on PDN stage?

    If so, there may be a wiring error (but you make sure the connections are all correct) or the chip may have failed behavior.

    You can ask local FAE to do the FA test (Failure analysis) to see what the root cause is.

    Claudio Casagrande said:
    Switch buttons PD and STDBY were both OFF.

    BR.

    Wei Qiu.