LM51551-Q1: TINA simulation issue

Hi Aditya Sankhe,

Sorry to see that you are having an issue with the LM5155 TINA model.

Can you please send the simulation file? This way I can check to see if the simulation works on  my computer.

Thanks,

Garrett 

Hi Garrett,

Please find attached file.
LM5155_Q1.TSC

Hi Garrett,

Were you able to simulate it?

Hello Aditya,

Please excuse the late response. I can observe the same issue as you. The transient simulation starts when the initial values are changed, but I am getting another failure before it finalizes simulation.

I am sorry, but the expert for this device is out of the office this week. I will try to get some information for you, but it might take longer than expected. Please be assured that you will get an answer latest next week.

Hi Aditya

I was able to the simulation at the link below to run. 

www.ti.com/.../snvmbv8

I suggest stating with this simulation and changing the values to meet your schematic. This should allow you to get the simulation up and running.

Please let me know if you have any questions.

Thanks,

Garrett

Hi Garrett,

I was able to simulate but the Vout waveform is not similar to what i am getting on LM5155 eval board.

I am getting around 150mV of ripple at CR load of 12ohm (see attached image)

.

in TINA:  it's around 56mV and Vout waveform is no where similar to what i am getting on eval board.

is TINA model accurate? could you verify this on your end?

Hello Aditya,

The TINA model is for sure not 100% reacting like the real circuit. In addition, there are parasitic components in the real circuit that are not present in the TINA model. Did you exchange components on the EVM? If yes, please share your circuit.

Hi Brigitte,

I did not modify anything on Eval board. I wanted to see how accurate is TINA simulation model vs the actual eval board. i understand there are parasitic components in real circuit but would this give almost 100mV ripple difference?