LM5117-Q1: Pspice or SIMetrix/Simplis model available?

nathan mitchell

Part Number: LM5117-Q1
Other Parts Discussed in Thread: LM5117, LM5145

A while back there was a thread regarding a TI tinaspice model of the LM5117 that would fail convergence on SIMetrix/Simplis (diode discontinuity error). Has that model been tweaked or has another become available?

over 4 years ago

0 Timothy Hegarty over 4 years ago

TI__Guru 73682 points

Hi Nathan,

I doubt a TINA model runs on SIMPLIS. However, I may be able to provide a simplified SIMPLIS model - what functionality is required? For example, control loop / bode plot / compensation frequency domain analysis or load transient time domain analysis?

Regards,

Tim

0 nathan mitchell over 4 years ago

Prodigy 70 points

Tim,

The TINA model will do a startup in transient simulation but will not do anything requiring a periodic operating point. I need to do a compensation bode plot, line/load transient, and efficiency analysis.

Thanks,

-Nate

+1 Timothy Hegarty over 4 years ago in reply to nathan mitchell

TI__Guru 73682 points

Hi Nate,

I recommend using the LM5117 Excel quickstart calculator to check the bode plot. Also, WEBENCH is a useful tool for predicting efficiency (our more advanced quickstart calculators, such as that for the LM5145, can also provide efficiency predictions).

For load transient and bode plot analyses, I have attached a simplified SIMPLIS model here that provides both simultaneously - please edit as needed.

Regards,

Tim

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/LM5117-model.sxsch

0 nathan mitchell over 4 years ago in reply to Timothy Hegarty

Prodigy 70 points

Tim,

Thank you, worked like a charm.

-Nate

0 Timothy Hegarty over 4 years ago in reply to nathan mitchell

TI__Guru 73682 points

No problem, thank you too,

Power management

Power management forum

LM5117-Q1: Pspice or SIMetrix/Simplis model available?