hi eetech,
Many thanks for the fix.

hi gok,
Post your circuit design when ready, we can now check the operation.
E

 

Hi,
The expected output voltage is 180V,100mA for input supply of 24V. But I am getting only 32V. Please help me to fix the issue

 

hi gok.
It is not a device I am familiar with, but I could check out your calculations, against the datasheet, if you post your calculations.

E
BTW: I do have the datasheet,

 

hi gok.
It is not a device I am familiar with, but I could check out your calculations, against the datasheet, if you post your calculations.

E
BTW: I do have the datasheet,

 

hi gok,
I really want to see your calculations, for your circuit component values.

E

 

Hi,
These are the calculations I got based on the datasheet for my requirements. Hopefully you could understand it

 

hi gok,
See what you mean about readability.

Noticed one point in your design, regarding V_BIAS, you are outside the Vcc specification.

 

I reduced it to 12V

 

hi
OK,
What is concerning me is that we are not 100% sure that we have viable working LM5155 model.

I have been searching for a known working circuit example which we could simulate.
This would prove the LM5155 model.

Do you have a known working circuit to post.?


E

 

Hi,
I have found a working circuit in TI's website. I think it is simulated in pspice
https://webench.ti.com/power-designer/switching-regulator/simulate/3

 

I have improved the model a bit and added it to my collection.
http://bordodynov.ltwiki.org/

 

I hasten to disappoint - the model is not correct (and therefore mine too). Wrong voltage on the FB.

 

Hi,

Has somebody achieved a valid LTSpice model for LM5155 or already knows how to modify the PSPice original one to make it works on LTSpice?

Thanks in advance

 

I hasten to disappoint - the model is not correct (and therefore mine too). Wrong voltage on the FB.

I have corrected the model and made improvements.

 

Hi,

Has somebody achieved a valid LTSpice model for LM5155 or already knows how to modify the PSPice original one to make it works on LTSpice?

Thanks in advance

Hi

Yes. I have modified the model for LTspice.
I have included a WinBench Design for a Boost converter 10-12v input to 24v@2A output
Files attached.

See below.
The SS parameter now works.

Slow start enabled:


Slow start disabled:

 

Hi,
The expected output voltage is 180V,100mA for input supply of 24V. But I am getting only 32V. Please help me to fix the issue

I know this is an old post, but the LM5155 will not support 180v boost output.

 

Hi

Yes. I have modified the model for LTspice.
I have included a WinBench Design for a Boost converter 10-12v input to 24v@2A output
Files attached.

See below.
The SS parameter now works.

Slow start enabled:
View attachment 261808

Slow start disabled:
View attachment 261809

Thank you sou much eetech00. I have checked themodel on my boost converter schematic and works perfectly, amazing!!

 

I know this is an old post, but the LM5155 will not support 180v boost output.

Thanks so much for providing a working LTSpice model for LM5155. So much of what was on this thread previously did not work. Now that I have that, I will try to get working something like this which should be good for 180V or higher output.