TINA/Spice/LM5085: Simulation of LM5085 in TINA and PSPICE

David Sanchez20

Part Number: LM5085
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi all,

I'm designing a 120W (Vin:24-72V, Vout:12V and Iout:10A) buck converter using the LM5085.

To know if my design fulfill the specifications, I'm using in parallel TINA and Orcad PSpice A/D by using the model of the LM5085, but I found that both give me very differents behaviours. For example, at 3ms the simulation carried out in TINA gives me 1.84V in contrast to the 250mV of PSPICE.

Anyone knows what's happening??

Many thanks for your help!

David

over 7 years ago

0 Brani Dubocanin over 7 years ago

TI__Expert 4100 points

Hello,
I will move this post to the responsible group.
Regards
Brani

0 Saket over 7 years ago in reply to Brani Dubocanin

TI__Intellectual 2680 points

Hi David,

Could you please share your PSpice schematic and TINA's TSC file with us for which you observed above issue?

Regards,
Saket

0 David Sanchez20 over 7 years ago in reply to Saket

Prodigy 150 points

Hi all,

I've found the problem!! When I modelled the inductor I placed a parallel resistance which it wasn't the correct for the inductor I want to use. After removing this resistance everything worked properly!

Thanks lot for your help and time!

David

Power management

Power management forum

TINA/Spice/LM5085: Simulation of LM5085 in TINA and PSPICE