Author Topic: Simulating LEDs in LTSpice  (Read 2160 times)

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Offline lilmantisTopic starter

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Simulating LEDs in LTSpice
« on: March 01, 2019, 03:49:43 pm »
I am trying to simulate LEDs in LTSpice and the PSpice model available looks like this:

.MODEL  SPMWHT541ML5XAR0S0_AZ_Min D
+ IS=9.5E-26
+ N=1.83199622528087
+ RS=1.55320994268357
+ TRS1=-0.00109167328584789
+ TRS2=0
+ EG=2.1
+ XTI=27.4316298646001
*$

.MODEL SPMWHT541ML5XAR0S0_AZ_TYP D
+ IS=9.5E-26
+ N=1.88254340719771
+ RS=1.59634934164592
+ TRS1=-0.000948164679596289
+ TRS2=0
+ EG=2.1
+ XTI=30.8148132453387
*$

.MODEL SSPMWHT541ML5XAR0S0_AZ_MAX D
+ IS=9.5E-26
+ N=1.89968242930065
+ RS=1.61078235439033
+ TRS1=-0.00109389046815565
+ TRS2=0
+ EG=2.1
+ XTI=31.1809226106151
*$

In LTSpice I made 3 components based on the QTLP existing models as follows:
.model QTLP690C D(Is=1e-22 Rs=6 N=1.5 Cjo=50p Xti=100 Iave=160m Vpk=5 mfg=Fairchild type=LED)

.model LED_Min D(Is=9.5e-26 Rs=1.55320994268357 N=1.83199622528087 Cjo=50p Xti=27.4316298646001 Iave=200m Vpk=5 mfg=Samsung type=LED)
.model LED_TYP D(Is=9.5e-26 Rs=1.59634934164592 N=1.88254340719771 Cjo=50p Xti=30.8148132453387 Iave=200m Vpk=5 mfg=Samsung type=LED)
.model LED_MAX D(Is=9.5e-26 Rs=1.61078235439033 N=1.89968242930065 Cjo=50p Xti=31.1809226106151 Iave=200m Vpk=5 mfg=Samsung type=LED)

There are some parameters in the PSpice model that do not appear in the LTSpice ones. Any idea how importand those are(EG and TRS) and what is the effect?  :-//
 

Online SiliconWizard

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Re: Simulating LEDs in LTSpice
« Reply #1 on: March 01, 2019, 04:35:45 pm »
Refer to the description of the diode model in the inline help.

LTSpice does support Eg, Trs1 and Trs2 parameters. The LTSPice provided models for many of the diodes and transistors are simplified ones and don't make use of all the supported parameters actually.

Eg is the activation energy in eV, Trs1 and Trs2 are temperature coefficients. If not provided in the model, LTSpice will use default values which are mentioned in the help.

 

Offline lilmantisTopic starter

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Re: Simulating LEDs in LTSpice
« Reply #2 on: March 05, 2019, 11:24:53 am »
Thank you for the help. All the best.
 


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