Hello everyone,

I'm currently working on my Power Electronics term project, in this term project, I'm supposed to design a boost converter circuit to light up a COB LED, along with a control circuit to adjust the brightness of the LED. My issue is with the control circuit, I would like to simulate it using Ltspice or whatever program I can use, however there's no available model online for the behaviour of the UC3525A, so is my only option to physically buy the parts and test my values in hardware?

Attached is a schematic of the control circuit.

Moderation: Cleaned up image.

 

It appears your circuit is just a test circuit and has little to do with a power supply.
By now you probably have learned this is a very old part.
I see SPICE files in many places including TI, GetHub, Source Forge, etc.
I don't know how to import them into LTspice. Search for "UC3525A spice file LTspice".

 

hi Izak,
This is the best I could find, the SG3525 version.
Download the *.rar and create the models from the *lib
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Basic sample.

 

Thank you both for your assistance.

 

hi,
We would like to see your final working LTS asc file for the project.
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hi,
We would like to see your final working LTS asc file for the project.
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I created a schematic for the controller circuit, but I still have no clue what values I should put for all the resistors and capacitors in the circuit, the professor didn't give us much information on that. I'm guessing I should be the one to figure out those values, but I don't really know how and where to start.

 

hi Izak,
Check out this video link.
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also.
https://www.google.com/search?clien...K4oqInlF9AM&vssid=_UYsMafDvOvK4hbIP8Kab6QE_58

 

hi Izak,
Check out this video link.
E

also.
https://www.google.com/search?clien...K4oqInlF9AM&vssid=_UYsMafDvOvK4hbIP8Kab6QE_58

thanks, I'll check them out.

 

Hello @ericgibbs

My bad it took a very long time but I finally figured out the values for all the parts and got it working at my desired duty cycle and frequency. Attached below is a picture of the schematic.

Again, thank you very much for your help.

 

hi Izak,
Nicely done.
Please post your LTSpice asc file.
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hi Izak,
Nicely done.
Please post your LTSpice asc file.
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Of course, here it is.

 

Hi, i have the exact same project (we are probably classmates, from ITU). Can you tell me where did you find the symbol for TC427 ?