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LMZ31520: Output Voltage

Hirotsugu Kobayashi
Mastermind 8675 points
Part Number: LMZ31520
Other Parts Discussed in Thread: LMZ31710

Hi, team.

Does it break if the output voltage of the LMZ31520 is 4.1V?
It is good not to break even if the voltage accuracy and various characteristics worsen.

Best Regards,

  • 0
    TI__Guru 50120 points
    Hi Kobayashi,

    What is the application you plan on using this in? The recommended maximum output voltage is 3.6V for a stable and regulated output. I can't say for certain if this breaks the device or not since pushing this to higher output voltage introduces larger output voltage ripple which may result in thermal constraints or stability issues. I have not tested this device with your application condition and would generally not advise people to use any device in applications beyond datasheet specs.

    Regards,
    Jimmy
  • 0 in reply to Jimmy Hua
    Mastermind 8675 points
    Hi, Jimmy.
    Application is medical equipment.
    Competition is LTM4628.
    12Vin 4.1Vout 15A is necessary, but there are no products that can produce 3.6V or more with large current.
  • 0 in reply to Hirotsugu Kobayashi
    TI__Guru 50120 points
    Hi Kobayashi,

    Unfortunately the TI power module portfolio doesn't have anything that will fill this space. Can you let me know what the 4.1V output will power? This information would be great for us to know so we can help define devices that will accommodate this customer application in the future.

    Regards,
    Jimmy
  • 0 in reply to Jimmy Hua
    Mastermind 8675 points

    Hi, Jimmy

    Since the switching power supply board and the sensor board are separated as shown in the block diagram, the power is supplied by the cable.
    Considering the voltage drop due to the cable, it is set to 4.1V.
    Although it is somewhat special usage, DC / DC can not be placed on the sensor board side, so it has such a configuration.

    Although the number increases, we propose parallel use of LMZ31710.

    Thanks,

  • 0 in reply to Hirotsugu Kobayashi
    TI__Guru 50120 points

    Hi Kobayashi,

    Thank you for sharing your system block diagram. This helps me get a better understanding of where the 4.1 is needed. 

    Regards,

    Jimmy