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edit approved Oct 28, 2023 at 15:02
Ergophobia
edit approved Oct 28, 2023 at 15:02
Ergophobia
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I'm working on a project using some 5mm through-hole LEDs that I purchased. I want to simulate my circuit in LTspice before soldering it. However, none of the the builtinbuilt-in LEDs in LTspice are close to the ones that I have.

I have measured some IV sample data. For example, this is the from the 5mm green LED: V1 = 2.61, I1 = 5mA; V2 = 2.46, I2 = 2.5mA; V3 = 2.24, I3 = 0.28mA; V4 = 2.14, I4 = 29uA; V5 = 2.03, I5 = 3.0uA.

I want to compute the model parameters and add them to the "standard.dio" file. This is an example of a builtinbuilt-in LED: ".model NSCW100 D(Is=16.88n Rs=8.163 N=9.626 Cjo=42p Xti=200 Iave=30m Vpk=5 mfg=Nichia type=LED)".

With the Shockley diode equation, and 3 measured IV samples, I can compute Is, Rs and N. I have two questions: (1) How to do regression analysis with more than 3 samples? My mathmaths knowledge only allows me to solve a linear model, but the Shockley diode equation is nonlinear. (2) Are there any existing tools or websites that compute this? If no, I'd like to make my wheel.

I'm working on a project using some 5mm through-hole LEDs that I purchased. I want to simulate my circuit in LTspice before soldering it. However, none of the the builtin LEDs in LTspice are close to the ones that I have.

I have measured some IV sample data. For example, this is the from the 5mm green LED: V1 = 2.61, I1 = 5mA; V2 = 2.46, I2 = 2.5mA; V3 = 2.24, I3 = 0.28mA; V4 = 2.14, I4 = 29uA; V5 = 2.03, I5 = 3.0uA.

I want to compute the model parameters and add them to the "standard.dio" file. This is an example of a builtin LED: ".model NSCW100 D(Is=16.88n Rs=8.163 N=9.626 Cjo=42p Xti=200 Iave=30m Vpk=5 mfg=Nichia type=LED)".

With the Shockley diode equation, and 3 measured IV samples, I can compute Is, Rs and N. I have two questions: (1) How to do regression analysis with more than 3 samples? My math knowledge only allows me to solve linear model, but the Shockley diode equation is nonlinear. (2) Are there any existing tools or websites that compute this? If no, I'd like to make my wheel.

I'm working on a project using some 5mm through-hole LEDs that I purchased. I want to simulate my circuit in LTspice before soldering it. However, none of the built-in LEDs in LTspice are close to the ones that I have.

I have measured some IV sample data. For example, this is the from the 5mm green LED: V1 = 2.61, I1 = 5mA; V2 = 2.46, I2 = 2.5mA; V3 = 2.24, I3 = 0.28mA; V4 = 2.14, I4 = 29uA; V5 = 2.03, I5 = 3.0uA.

I want to compute the model parameters and add them to the "standard.dio" file. This is an example of a built-in LED: ".model NSCW100 D(Is=16.88n Rs=8.163 N=9.626 Cjo=42p Xti=200 Iave=30m Vpk=5 mfg=Nichia type=LED)".

With the Shockley diode equation, and 3 measured IV samples, I can compute Is, Rs and N. I have two questions: (1) How to do regression analysis with more than 3 samples? My maths knowledge only allows me to solve a linear model, but the Shockley diode equation is nonlinear. (2) Are there any existing tools or websites that compute this? If no, I'd like to make my wheel.

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Wu Yongzheng
Wu Yongzheng
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Compute diode model parameters from IV curve

I'm working on a project using some 5mm through-hole LEDs that I purchased. I want to simulate my circuit in LTspice before soldering it. However, none of the the builtin LEDs in LTspice are close to the ones that I have.

I have measured some IV sample data. For example, this is the from the 5mm green LED: V1 = 2.61, I1 = 5mA; V2 = 2.46, I2 = 2.5mA; V3 = 2.24, I3 = 0.28mA; V4 = 2.14, I4 = 29uA; V5 = 2.03, I5 = 3.0uA.

I want to compute the model parameters and add them to the "standard.dio" file. This is an example of a builtin LED: ".model NSCW100 D(Is=16.88n Rs=8.163 N=9.626 Cjo=42p Xti=200 Iave=30m Vpk=5 mfg=Nichia type=LED)".

With the Shockley diode equation, and 3 measured IV samples, I can compute Is, Rs and N. I have two questions: (1) How to do regression analysis with more than 3 samples? My math knowledge only allows me to solve linear model, but the Shockley diode equation is nonlinear. (2) Are there any existing tools or websites that compute this? If no, I'd like to make my wheel.