TPS723-Q1: PSpice for TI Convergence Error

Caroline Ye

Part Number: TPS723-Q1

Tool/software:

Hello,

I am having some issues with simulating TPS72301-Q1 in PSpice for TI. It is giving me convergence errors that I am not sure how to fix. Can you help me?

TPS72301-2024-12-02T14-11.zip

Thank you.

1 month ago

0 Nick Butts 1 month ago

TI__Mastermind 47085 points

Hi Caroline,

I was able to get it to converge using a PWL voltage source and adding some series resistance with the ideal voltage source. Sometimes having the voltage source connected directly to the nodes of the model cause convergence issues since the voltage source often has discontinuities in its waveform.

0830.TPS72301-2024-12-02T14-11.zip

Regards,

Nick

0 Caroline Ye 1 month ago in reply to Nick Butts

Prodigy 50 points

Thank you for your help.

Is there a reason why the current through the load is negative?

0 Nick Butts 1 month ago in reply to Caroline Ye

TI__Mastermind 47085 points

Hi Caroline,

The load current for negative LDOs goes in the reverse direction. Is that what you are seeing based on the node you probed for the load current?

Regards,

Nick

0 Caroline Ye 1 month ago in reply to Nick Butts

Prodigy 50 points

Hi, yes. I just added a trace of I(Rload), which I believe it is the current through the load.

+1 Nick Butts 1 month ago in reply to Caroline Ye

TI__Mastermind 47085 points

Hi Caroline,

That is to be expected then. You can see this by looking at the relative polarity from input to output - the output is at a higher voltage than the input, and the "ground" side of the load is at a higher voltage than the output, so the current loop is backwards relative to a regular positive LDO.

Regards,

Nick

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TPS723-Q1: PSpice for TI Convergence Error