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Original question:

TINA/Spice/LMG1210: PSpice-Model of LMG1210

TINA/Spice/LMG1210: TINA/Spice/LMG1210 refrence design

Meghdad
Prodigy 70 points
Part Number: LMG1210
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello,

I have downloaded LMG1210 reference design  for EPC2001 and now it is not available in website. Does model have any problem? seocndly, I am not able to increase input voltage above ~55 V. I would be grateful if you can assist with this matter.

Regards

  • 0
    TI__Mastermind 30711 points

    In the reference design of LMG1210, if  you double click on EPC2001 symbol, you can see the netlist for EPC2001. 

    You can also  use any other device from the web,  not necessarily EPC2001. 

    Please refer to datasheet as you can see in  datasheet , Vin range of LMG1210 should not exceed 20V. In fact Vin is between 6 to 18V.

    I am closing this post.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Prodigy 70 points

    Hello Arash,

    Thank you for your fast reply. I had limited Vin to 18V and I had replaced it with EPC2034 too.  Problem is still existed. I have not changed PWM, but always above ~55V as an input for Buck(VG4 in the simulation) the output is less than 4 V!!! please look at the attached file.

    Thank you in advance for any help you can provide.

    Meghdad

  • 0 in reply to Meghdad
    TI__Mastermind 30711 points

    I will take a look at it, please send me the exact circuit that you are using so I start from your circuit with all modifications, even if it is just changing a supply voltage or timing or anything.

    Regards, Arash

  • 0 in reply to Arash Loloee
    Prodigy 70 points

    Hallo Arash,

    I have just seen that the second version for LMG1210 TINA model was updated, but i have still a same problem. In attachment you can see the simulation file. The only changes from my side is Vin=18V and Vin (VG4)=55 V. As I explained you before, if the VG4 is increased above ~55V, the circuit gets in trouble and output is about 4V which wrong(it must be about 55V/2= 27.5V ). 

    Thank you again for your support

    snom617b.tsc

  • 0 in reply to Meghdad
    TI__Mastermind 30711 points

    Hello Meghdad,

    We are working on a new model and as we wrap it , I will check for this issue before the corrected model is released. Sorry about the inconvenience.

    Regards,

    Arash 

  • 0 in reply to Arash Loloee
    TI__Mastermind 30711 points

    Hi, I just checked the new model. Basically a model has to create the correct pulses and voltages at its pins. In your schematic, Ho , HB, and LO were not coming up correctly at pins , so clearly it was not pulsing and thus nothing connected to  the model would have worked .

    With new model I  checked the signals at all  pins and they are correct now. I also did 2 quick tests with ideal switches (with 50 and 80 volts). The LMG1210 worked fine at 80V. Test bench and  output voltage are shown here. It will take a while to replace to old model on the web with this new one. 

    I am going to close this ticket as I verified the issue with old LMG1210 model  and new model  is on its way. Thanks for pointing out the problem.

    Arash