• State
  • Replies 7 replies
  • Subscribers 38 subscribers
  • Views 152 views
  • Users 0 members are here
Support feedback
Options
Options
Related

LM3670: Require LM3670 unencrypted SPICE Model

KAVIARASU KRISHNAMOORTHY
Prodigy 20 points
Part Number: LM3670
Other Parts Discussed in Thread: LM3671, TPS62743, TPS62840, TPS628301

Tool/software:

Hi,

I am performing EMI simulations using ANSYS tool involving LM3670 part number. I need this DC/DC converter SPICE for the simulation purpose. Kindly request you to do the needful at the earliest.

  • 0
    TI__Mastermind 23390 points

    Hello Kaviarasu,

    thanks for reaching out in E2E.

    There is no SPICE model available for the LM3670.

    You could use the WEBENCH® POWER DESIGNER to perform simulations for evaluation.

    Best regards,

    Andreas.

  • 0
    TI__Mastermind 23390 points

    Hi,

    There was no feedback since a while, so I assume this tread is resolved and can be closed. You can still reply to this thread after it is closed, or you can create a new thread.

    Best  Regards,
    Andreas.

  • 0 in reply to Andreas Mueller
    Prodigy 20 points

    Hi Andreas,

    ANSYS tool require Unencrypted PSPICE model for the simulation and WEBENCH® POWER DESIGNER to perform simulations for evaluation won't be useful in this case.

    Regards,

    Kaviarasu

  • 0 in reply to Andreas Mueller
    Prodigy 20 points

    ANSYS simulation tool requires unencrypted PSPICE model for simulation and WEBENCH® POWER DESIGNER to perform simulations for evaluation is not useful.

  • 0
    TI__Mastermind 23390 points

    Hi Kaviarasu,

    thanks for your feedback.

    I can suggest two workarounds:

    1. Testing instead of simulating. There is an EVM board available for LM3671 with the same SOT23-5 pin-out. So it would be possible to solder a LM3670 on this board, adjust the BOM to match the LM3670 typical application. I could check with our customer support team for EVM and Samples availability.

    2. Chose a different device. The LM3670 is a rather old device. Newer similar devices would be TPS62840 or TPS62743. Please let me know the specific requirements which were relevant for selecting LM3670, so I can help to find a suitable newer device.

    Please let me know your thoughts.

    Best regards,

    Andreas.

  • 0 in reply to Andreas Mueller
    Prodigy 20 points

    Hi Andreas,

    I am doing a simulation for an industrial automation product. The TI LM3670 is suggested and considered by the design engineers. Currently I am performing pre-compliance EMI/EMC simulation at PCB level using ANSYS tool. For this simulation, Unencrypted PSPICE model is must to see the emission report.

    LM3670 has switching frequency of 1MHz and TPS62840 has switching frequency of 1.8MHz, so TPS62840 cannot be considered as alternative for Radiated Emission simulation.

  • 0
    TI__Mastermind 23390 points

    Hi Kaviarasu,

    thanks for your feedback.

    I did not mean simulating with a different device model for LM3670 behavior, but I meant changing the design to a newer device. Would this be an option?

    If so, which switching frequency range would be OK or which range should be avoided?

    We also have EMI optimized devices, such as the TPS628301.

    Please let me know your feedback.

    Best regards,

    Andreas.