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Original question:

TINA-TI LED Macro

TINA/Spice: Designing of Cree LED in TINA-TI

Sneha Agarwal
Prodigy 110 points
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hi,

Can you suggest me a way to design a cree LED in Tina-TI for its simulation purposes. The part number of LED is MHBAWT0F0BD265E. 

When I was trying to design I came up with such parameters:

Saturation current : 0.1

peak Wavelength = 455nm

Energy gap = hc/lambda = 2.73eV

Max frwd current = 350mA

Typical frwd current = 180mA

Max Power distribution = 7W

Now if I try to find serial resistance, since cree led does not have a linear graph of current versus voltage, I cannot find resistance. More importantly Cree led has current = 0 at 16V and 180mA at 18V. Therefore I don not need a linear graph. Thus even after changing emission coefficient, though threshold can be made 16V but linear graph is not changed and I am unable to get 180mA at 18V. 

Can you please help?

Thanks in advance.cree_at_forum.TSC

  • 0
    TI__Genius 9775 points

    Hi Sneha,

    Have you tried experimenting with diode model .MODEL in spice? There are many knobs that you can use in .MODEL for diode in spice instead of using native variables within TINA. I think if you read the manual for .MODEL and play around with those knobs and match it with equation inherent within diode model, you will be able to match what you need to certain extent.

    There should be plenty manual for diode model by searching in google etc.

    Herman