vt and vh from Texas Instruments PSpice model - not recognised

[36jemini]

Hi

My name is Jesper, I'm a Mechatronics student at the University of Southern Denmark with focus on power electronics. This is my first post on this forum.

I have a problem with an inported PSpice model from Texas Instruments (Attached).

I have followed the import tutorial (http://www.ni.com/tutorial/3173/en/), but get the following errors when simulating:

------ Checking SPICE netlist for Design1 - 8. november 2016, 11:35:44 ------
SPICE Netlist Warning in schematic RefDes 'u1', element 'sosc':  Unknown model parameter 'vt', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes 'u1', element 'sosc':  Unknown model parameter 'vh', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes 'u1', element 'suvlo':  Unknown model parameter 'vt', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes 'u1', element 'suvlo':  Unknown model parameter 'vh', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes '', element 'sosc':  Unknown model parameter 'vt', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes '', element 'sosc':  Unknown model parameter 'vh', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes '', element 'suvlo':  Unknown model parameter 'vt', this parameter will be ignored.
SPICE Netlist Warning in schematic RefDes '', element 'suvlo':  Unknown model parameter 'vh', this parameter will be ignored.
======= SPICE Netlist check completed, 0 error(s), 8 warning(s) =======

The problem seems to stem from vt and vh not being recognised in Multisim.
Can anyone elaborate on how to solve the issue or move closer to a solution?

****OSCILLATOR*****
STOF1 8 GND RTCT GND SOSC
GBDISCH RTCT GND Value = { IF ( V(8,GND) < 2.5 & V(13,GND) > 2.5, 8.4M, 0 ) }
RPULL 8 VREF 100K
****UVLO***********
STOF2 VDD 19 VDD GND SUVLO
RUVLO 19 GND 1MEG

**********************

.MODEL SOSC VSWITCH (RON=.01 ROFF=1MEG VT=1.45 VH=0.95) ; VT=1.45 set to match 53k @ 3.3n/10k
.MODEL SUVLO VSWITCH (RON=.01 ROFF=5MEG VT=8.0 VH=0.4)

 Any help will be much appreciated.

BR Jesper

[36jemini]

I found the solution to the problem!

Looking up the VSWITCH command I found VSWITCH(RON=X ROFF=X VON=X VOFF=X)

Changeing VT to VON and VH to VOFF solved my problems.

Unfortunately something is still wrong in the model regarding the Oscillator

****OSCILLATOR*****
STOF1 8 GND RTCT GND SOSC
GBDISCH RTCT GND Value = { IF ( V(8,GND) < 2.5 & V(13,GND) > 2.5, 8.4M, 0 ) }
RPULL 8 VREF 100K

*********

.MODEL SOSC VSWITCH (RON=.01 ROFF=1MEG VON=1.45 VOFF=0.95) ; VON=1.45 set to match 53k @ 3.3n/10k

Having a capacitor placed between RTCT and ground and chargeing it through a large resistor results in a large enough voltage (above 1.45V) but does not seem to trick the switch. Any suggestions?