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TAS5414C-Q1 DC Detection for the Destruction of the Output FETs

Sadanori Kato
Guru 36510 points
Other Parts Discussed in Thread: TAS5414C-Q1

Hi,

Could you please tell us whether TAS5414C-Q1 can detect the DC error as the following situations ?

Q1. Broken Half Bridge
Could this device detect the dc error if a half bridge is broken only(other half bridge is alive) ?

Q2. Broken Full Bridge
Could this device detect the dc error if a full bridge is broken ?

Q3. Condition that Cannot Detect DC Error
If there is the conditions that can not detect the DC error, would you tell us them ?

Best regards,
Kato

  • 0
    TI__Mastermind 36455 points

    Kato-san,

    I think you may have DC offset detect or protection confused with Overcurrent protection.  

    In the very rare case of a Broken Half Bridge or a Broken Full Bridge the overcurrent protection will trigger, long before the DC Detect will trigger.  

    The DC detect will only detect long term DC offset that do not trigger other protection mechanisms.  

  • 0 in reply to Gregg Scott
    Guru 36510 points

    Hi Gregg-san,

    Thank you for your quick response.
    I have an additional question.
    For example, does the DC detection feature work if a half bridge or a full bridge is broken and the DC offset voltage occurs ?

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Mastermind 36455 points
    Kato-san,
    As I stated in my earlier post, the overcurrent protection would trigger before the DC offset detection. The DC offset detection is slower than the overcurrent protection. Thus, one should not rely on the DC offset detection to protect against a rare possibility of a broken bridge.
  • 0 in reply to Gregg Scott
    Guru 36510 points

    Hi Gregg-san,

    Thank you for your reply.
    Is it possible to detect the DC offset error if the output DC Offset occurs at the threshold below an overcurrent ?
    Moreover, does it mean that the DC detection does not work(so that the device shut down) if the output fets are broken by an overcurrent ?

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Mastermind 36455 points
    Kato-san,
    If the DC offset occurs and the current is below the overcurrent shutdown, the DC Offset Detection will function and protect the device.
    If the output FETs are broken and if for some reason the device does not trigger other faults, the DC detect would function. (This scenario is highly unlikely to occur)
  • 0 in reply to Gregg Scott
    Guru 36510 points

    Hi Gregg-san,

    Thank you for your reply.
    Could you please tell me what kind of the fault this device will detect except the DC offset error if the output fets are broken by being shorted to PVDD or GND or other voltage source ?
    Actually, the undervoltage of AVDD and charge-pump have occurred.

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Mastermind 36455 points
    Kato-san,
    If the AVDDUV and CPUV have are triggered the output stage is in Hi-Z.
    1. If the outputs are broken, I do not know what will happen, as this is not a fault, but a severe failure. It would probably blow the fuse on the PVDD line.
    2. If the outputs are simple shorted to GND or PVDD and the output stage is in Hi-Z. Nothing will happen because the AVDDUV and CPUV are triggered. If the AVDDUV and CPUV are cleared, load diagnostics should be run to verify that the outputs are not shorted to power or shorted to ground. If shorted, then it should not be placed into play mode.
  • 0 in reply to Gregg Scott
    Guru 36510 points

    Hi Gregg-san,

    Thank you for your advice.
    I understood and will inform our customer of your information.

    Best regards,
    Kato