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LMZM33606: About PSPICE model

Tsukui Yusuke
Guru 21930 points
Part Number: LMZM33606

Hi,

Could you tell me about LMZM33606 PSPICE model?
Please confirm the attached file.
Customers want to simulate external synchronous operation in LTSPICE.

１．Customer corrected the blue frame at his own convenience.
　　As a result, some error messages occurred.
　　Is this a problem?

２．Customer performed the simulation in state ①.
　　As a result, in the case of the external synchronization operation, the output voltage has risen.
　　Please tell me the cause.

LMZM33606.pdf

Could you give me your advice？

Best Regards,
Yusuke

  • 0
    TI__Guru 50120 points

    Hi Yusuke-san,

    I am going to contact the Spice modeling team to get a more detailed answer to this. My initial comments are below:

    1. I believe the syntax for this should be "V_V1         AGND PGND 0". You do not need to have the Vdc unit indicator. Can you retest this to see if you run into any errors with the new suggested line of code?
    2. I don't think the simulation file has the external synchronization feature modeled into it. Below is an image of the available features that can be tested for this model.The simulation result you see most likely is not representative of what the output votlage should be. 
    3. It may be easier to understand the system with a physical EVM and lab bench test. I can provide you with a sample of the EVM to test functionality to streamline your design process. You can contact me directly at j-hua@ti.com for more information on this.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Guru 21930 points

    Jimmy-san,

    Thank you for your support.
    After confirmation, I will contact you.
    And We look forward to comments from Spice modeling team.

    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Guru 50120 points

    Hi Yusuke-san,

    I wanted to clarify that the model does include the SYNC functionality. It is part of the MODE pin functionality for FPWM.

    Can you confirm that you were able to do the following in SPICE:

    1-If you put an external clk on Model/SYNC, it should override the frequency generated internally by RT pin after some time.

    2- If Model/SYNC is pulled low, the part function in DCM at light loads and in CCM mode at higher loads with the freq. set by RT pin

    3- If Model/SYNC is pulled High, the part function in CCM , no matter what load you have attached.

    Similar to my comment on your other post, since TI does not use LTSpice, if there are any syntax issues that is preventing you from simulating the model properly, you will need to contact the appropriate software developer to get the model to converge.

    Regards,

    Jimmy