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PGA460: Thermal Shutdown

Phillip Silvaggio
Prodigy 90 points
Part Number: PGA460

At what temperature will the device go into thermal shutdown?

If the device is in thermal shutdown and a burst+listen/ultrasonic measurement is run, will the data path values simply be as if a listen/ultrasonic measurement was performed (since the output drivers are disabled)?

Thank you

  • 0
    TI__Intellectual 1020 points
    Hi Phillip,

    We are currently looking into this and get back to you soon.

    Regards

    Vaibhav
  • 0
    TI__Intellectual 1020 points
    Hi Phillip,

    The thermal shutdown in PGA460 is meant to protect the device at extreme conditions during burst only. It's value will much higher than 125C which above the allowed operating range for PGA460. For normal use with transformer, the current limit circuit along with VPWR over voltage protection will prevent a thermal event. In RDS on mode, it might be possible in an extreme condition to trigger thermal shutdown.

    When thermal shutdown occurs, which can happen only during a bursting cycle, the FETs are turned off and the thermal condition will go away quickly. The device returns to idle mode and the new command has to be issued. The next command can be for listen only or burst and listen. A listen only command will not cause thermal shutdown.

    Regards,

    Vaibhav