TPS51285B: TPS51285B LTSpice simulation fail

Alex M2

Part Number: TPS51285B
Other Parts Discussed in Thread: TPS51275B

Hello, TI

I try to start the simulating my D-CAP converter based on TPS51285B_TRANS.LIB spice model from downloads of the product page and get the error massege: "Undefined subcircuit: and2"

I added the subcircuit as

*$
.SUBCKT AND2 A B OUT
EOUT OUT1 0 VALUE { IF( V(A)>0.5 & V(B)>0.5,1,0) }
R1 OUT1 OUT 1
C1 OUT 0 10p
.ends AND2

and tried to start again, and get the next error message: "Undefined subcircuit: dff", I have no idea what the "dff" is. Could you help me?

Thanx!

over 3 years ago

0 Alex M2 over 3 years ago

Prodigy 190 points

PS: spice model for TPS51275B works fine. It seems to me, that model for TPS51285B incomplete!

0 Lishuang Zhao over 3 years ago in reply to Alex M2

TI__Expert 7500 points

Hi Alex,

Is that okay for you to use TPS51275B Pspice model first? We will look into TPS51285B model.

Thanks,

Lishuang

0 Alex M2 over 3 years ago in reply to Lishuang Zhao

Prodigy 190 points

Thanks for your reply

Yes, it is ok. I have done my design calculations for TPS51275B and TPS51285B and both designs are identical except for inductance and CS resistor, and I think if the TPS51275B based design model matches the calculations, then the TPS51285B will also matches the calculations. But I would like to compare these two models in terms of performance.

0 Andrew Xiong over 3 years ago in reply to Alex M2

TI__Expert 5180 points

Hi Alex,

It seems that's a issue caused by software/simulation config.

You can try to use the method in this post and see if it could work: https://e2e.ti.com/support/tools/simulation-hardware-system-design-tools-group/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/952719/error-orpsim-15461-incorrect-number-of-interface-nodes-for-x_u1.

I tried with default Pspice model and it worked after I removed the nom_pspti.lib from the library list, as suggested in the linked post.

Thanks,

Andrew

0 Alex M2 over 3 years ago in reply to Andrew Xiong

Prodigy 190 points

I don't have Pspice, I use LTSpice instead. Can you give me a file with a subcircuits of standard logic gates ("nom.lib" if I understand correctly)? Then I will try to add missing gates to model.

0 Andrew Xiong over 3 years ago in reply to Alex M2

TI__Expert 5180 points

Hi Alex,

I added it in the attachment. Please check if it works for you.

nom.lib

Regards,

Andrew

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TPS51285B: TPS51285B LTSpice simulation fail