How to write the code for spice model?

Hello Everyone,

I want the Spice Model for SR1660 which is a Schottky Barrier Rectifier. I have search in the Google but I couldn't found it.
If the Spice model is not available, how to write the Spice code for the model by seeing the datasheet?


Here, I have attached the datasheet of the SR1660 device.

SR1660 Datasheet

You will probably get away with using any Schottky diode that has ratings similar to the one you are using. It would have to be some very critical application that required any more than that. If there is some critical application, then bread boarding the system would probably be necessary, or you will need to measure all the parameters for the diode not supplied in the data sheet.
http://www.allaboutcircuits.com/textbook/semiconductors/chpt-3/spice-models/
https://www.google.co.nz/search?tbo=p&tbm=bks&q=isbn:1439860467
may help. Some versions of spice have slightly different ways of formatting the data, so you need to read up on the .model statement for the version of spice you are using. Additionally, some versions of spice have support for parameter extraction from data sheet data.
Hope that helps,
cheers,
Richard

Hello RICHARD,

Thank you for your suggestions......

I have gone through the link which you provided. But, I have so many quires.

Initially, They are calculated Spice Model for Silicon Diodes.

How they are calculated the VT value and some of the values are taken as a default value which are RS, TT, VJ, EG and XTI values. So, how these values can be calculated?

And also said in that link, For the Schottky Diodes some parameters (i.e: RS, TT, VJ, EG and XTI) values are consider as a default values. But, they are not following. If you see in the table no.2. you may know.

In my case I am using the Schottky Diode. So, how I have to design those values. Especially, how there are calculated VT value.

Please, let me know clear explanation.

Hi,

How to calculate the exact emission co-efficient value of Schottky Diode ?

I have followed the link which is mentioned below.

http://www.tietze-schenk.com/tsprben.pdf

In that pdf mentioned that (page.no: 16 under equation 1.6) the emission coefficient n = 1 for ideal diodes and for real diodes n = 1.....2, but they are not mentioned the exact value for Schottky diodes or real diodes. So, how we can choose the exact emission co-efficient value for Schottky diodes.

(or)

We can choose any one of the value which is between 1 to 2 ?

The value is manufacturing/process dependent. It is also dependent on operating current, so there is no "exact" value. The default in Pspice is 1.
Try two different models, one with a value of 1, the other with a value of 2, and see if you can discern any difference in the simulation results,
cheers,
Richard

Hello,

I am using the SR1660 diode. In this diode, the voltage range 20-60 volts and the current is 16A. So, Please can you tell me which value I can use by seeing the data sheet.

Here, I have attached the datasheet.

You can't see the value from the data sheet for the emission coefficient, as I said, it is manufacture/process dependent, and a value in an equation which gives a rough approximation of a diodes characteristics. As I said, plug the values of 1 and 2 (create two models of the same diode, and give them different names) into the diode data, and see if you can see any difference in the simulation results. The models used in spice are approximations only, it is not possible to exactly model a device. So even if you get a "correct " value, all of the other parameters are just as likely to be approximations as well.
Cheers,
Richard

Hello Again,

I have following the both links which is mentioned in the above 1st reply.

Link 1:
https://www.google.co.nz/search?tbo=p&tbm=bks&q=isbn:1439860467

In the above link saying that (page 203 last paragraph), The most important parameters for power electronics applications are IS, BV, IBV, TT, and CJO.

So, these values are enough to calculate in order to use as a diode (i.e rectifier) in power electronics applications. (or) I have to calculate all of them which is mentioned the in the below link.

Link 2:
http://www.allaboutcircuits.com/textbook/semiconductors/chpt-3/spice-models/#diodespice.tbl

Actually, I have calculated IS, CJO and N by following the above two links....

But, there are not clearly mentioned about the below questions......

1) How to calculate this Ohmic Resistance RS ?
formula for RS; ( value = RS / area ); how to calculate value and area ?

2) How to calculate Transit time TT ?
In the data sheet they are not mentioned TT value.
In order to calculate TT, how to know Reverse recovery charge, QRR and IFM if
those values which is not mentioned in the data sheet?

Please, let me know the explanation for 2 questions ? then I will get full confident about how to develop the spice model for Schottky diodes!