• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 64 subscribers
  • Views 1673 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TINA/Spice/LM3402HV: LM3402HV LED Driver Spice Model

Mango
Prodigy 30 points
Part Number: LM3402HV
Other Parts Discussed in Thread: TINA-TI, , LM3402

Tool/software: TINA-TI or Spice Models

Hello community,

we have a problem with the LM3402HV: we need to simulate the circuit for a new product/project which will maybe contain/use the LM3402HV model. Unfortunately we couldnt find a tina-ti or pi-spice model for it until now (only found the normal voltage model).

Could anyone provide me with the HV model? Another similar one would also help us to simulate this device. 

Thanks a lot in advance and best regards,

Mango

  • 0
    TI__Mastermind 25500 points

    Hello Mango,

    Does the model limit your input voltage? Does the webench model also limit input voltage? In either case it's a relatively simple and predictable device. If you need any design input I would be happy to provide some if you can give me the specs such as input voltage range and LED stack voltage/current.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    Prodigy 30 points
    Hi Clint,

    thanks a lot for the fast response.
    We want to use the led driver as a constant current source in our cicruit (for battery systems, no light applications). The model doesnt limit the input voltage.
    We would need a model for an output of 60V and 200mA. Input ist about 65V (regulated directly by the power supply).

    Thanks a lot in advance
    Mango
  • 0 in reply to Mango
    TI__Mastermind 25500 points

    Hello Mango,

    Did you get what you need from Webench then? If not it is a pretty easy device. The LM3402HV evaluation board could actually be used and you would only need to adjust RON (higher value to keep a reasonable switching frequency) and the current sense resistor value. Those equations are in the datasheet but the values might need to be tweaked on the bench a little bit to get the current you want.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    Prodigy 30 points

    Hi Clint,

    thank you for your fast reply!

    Ive tried to simulate the circuit with webench now seperate times, but the page doesnt work constantly: everytime I want to edit the circiut to change the parts, the site was loading for minutes and didnt response anymore. Ive tried it with different browsers. As we want to use the LM3402HV as a constant current source without any LED or lightning application, I would have to delete the LED from the circuit, which was also not possible (it wasnt possible to add parts either)
    Besides that, we would prefer a simulation with pspice or tina-ti  for this project anyway (we work with those applications for other projects as well). As there is no model for the LM3402HV, -only the "normal" LM3402"- could you help me simulating the HV in tina ti? Is there any possibility to change the specifications of the normal, non HV model into the HV? Or could you even provide me with the HV model?

    For  our application we need a input voltage of 65V and a output voltage of 60V 

    Thank you very much for your support!

    Best regards

    Mango 

  • 0 in reply to Mango
    TI__Mastermind 25500 points

    Hello Mango,

    I'm not aware of any models other than those available on the web. But you can use the lower voltage model, just pick an input and output voltage that would give you the same duty cycle as what you are designing for. Then the circuit should be good with only the need to change RON for the higher input voltage to adjust to approximately the same switching frequency as that you simulated at lower input voltage. I hope that helps.

    Regards,

    Clint