LM5117: LTspice issue regarding unencrypted LM5117 model

Derick Rosas

Part Number: LM5117

Hi, I have the same problem regarding the use of the unencrypted LM5117 model. I've used it in microcap and gave the same error about the T (0,0) and when deleting it a singularity error occurs. Therefore, I implement it on the LTspice and it gave me an error of V3 has been shorted (V3 been a variable inside the LM5117 coding) when trying to simulate. My question would be if the problem is in the code, or it might be a bad connection made outside the model? In any of the two cases, what should I do to solve the problem? Thank you in advance.

over 1 year ago

0 Derick Rosas over 1 year ago

Prodigy 25 points

The circuit that I'm working on is the typical circuit section 8.2 on page 22 from the TI datasheet.

0 Derick Rosas over 1 year ago

Prodigy 25 points

0 Derick Rosas over 1 year ago

Prodigy 25 points

The error in LTspice:

0 Derick Rosas over 1 year ago

Prodigy 25 points

The error log:

Circuit: * F:\LTSpice\LTSPICE\.asc

Questionable use of curly braces in "b§g_abm2i2 vin vcc i={limit((v(n14931274)-v(vcc)-0.1)*10m,-30m,30m)} "
Error: undefined symbol in: "limit(([v](n14931274)-v(vcc)-0.1)*10m,-30m,30m)"
Questionable use of curly braces in "b§e_abmgate yint 0 v={if(v(a)>{{vthresh}}|v(b)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh))|v(b)>((vthresh)),((vdd)),((vss)))"
Questionable use of curly braces in "b§e_abmgate yint 0 v={if(v(a)>{{vthresh}}&v(b)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh))&v(b)>((vthresh)),((vdd)),((vss)))"
Questionable use of curly braces in "b§e_abmgate1 yint1 0 v={if(v(a)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh)),((vdd)),((vss)))"
Questionable use of curly braces in "b§e_abmgate2 yint3 0 v={if(v(yint2)>{{vthresh}},{{vss}},{{vdd}})}"
Error: undefined symbol in: "if([v](yint2)>((vthresh)),((vss)),((vdd)))"
Questionable use of curly braces in "b§e_abmgate yint 0 v={if(v(a)>{{vthresh}}&v(b)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh))&v(b)>((vthresh)),((vdd)),((vss)))"
Questionable use of curly braces in "b§e_abmgate yint 0 v={if(v(a)>{{vthresh}}&v(b)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh))&v(b)>((vthresh)),((vdd)),((vss)))"
Questionable use of curly braces in "b§e_abmgate yint 0 v={if(v(a)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh)),((vdd)),((vss)))"
Questionable use of curly braces in "b§e_abmgate yint 0 v={if(v(a)>{{vthresh}},{{vdd}},{{vss}})}"
Error: undefined symbol in: "if([v](a)>((vthresh)),((vdd)),((vss)))"
U1:r19: both pins shorted together -- ignoring.
Error on line 42 : v1 n001 0 v
Unknown parameter "v"
Fatal Error: Shorted voltage source: U1:v3

0 EricLee over 1 year ago in reply to Derick Rosas

TI__Guru 58171 points

Hello Derick

I am sorry. TI employee is not allowed to support LTSPICE. I will close this thread.

-EL

0 Derick Rosas over 1 year ago in reply to EricLee

Prodigy 25 points

Do TI employee allowed to support TINA?

0 EricLee over 1 year ago in reply to Derick Rosas

TI__Guru 58171 points

Hello Derick

Yes, you can download TINA model and example files at https://www.ti.com/lit/tsc/snvm619 https://www.ti.com/lit/zip/snvm620

-EL

0 Derick Rosas over 1 year ago in reply to EricLee

Prodigy 25 points

Hi Eric,

I downloaded PSpice for TI and build the LM5117 typical circuit as stated in its datasheet. The simulation "runs" but I don't see the graph where the signal is suppose to be simulated. After running for a while it gives the following error:

0 Derick Rosas over 1 year ago in reply to EricLee

Prodigy 25 points

0 Derick Rosas over 1 year ago in reply to EricLee

Prodigy 25 points

This is the circuit that I'm trying to do and the circuit build up in PSpice for TI.

0 Derick Rosas over 1 year ago in reply to EricLee

Prodigy 25 points

0 EricLee over 1 year ago in reply to Derick Rosas

TI__Guru 58171 points

Hello Derick

I saw the cases that the CSDxxx MOSFET model caused the convergence error multiple times. Please try again with ideal Voltage Controlled switches.

-EL

0 Derick Rosas over 1 year ago in reply to EricLee

Prodigy 25 points

Is it possible to import PSMN5R5 MOSFET model to PSpice for TI. I haven't found a model (in the case of the MOSFET) that I can import to PSpice for TI