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LM3488: PSPICE SEPIC Simulation is failing

Luke Faggion
Prodigy 40 points
Part Number: LM3488

Hi,

I'm not familiar with PSPICE for TI. I've tried to simulate a SEPIC converter using the LM3488 device.

I've attached the schematic and the out file from the simulation.

Could I get pointed in the right direction to find help for debugging these PSpice simulation errors or help me directly with debugging my simulation?

I've been searching the e2e forums and I can't figure out what is preventing the sim from running.

Fullscreen Steady State.out.txt Download 

**** 07/12/23 15:58:52 ******* PSpice 17.4.0 (Nov 2018) ******* ID# 0 ********

 ** Profile: "SCHEMATIC1-Steady State"  [ G:\Engineering\Simulations\lm3488-pspi


 ****     CIRCUIT DESCRIPTION


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




** Creating circuit file "Steady State.cir" 
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries: 
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of C:\cds_spb_home\cdssetup\OrCAD_PSpiceTIPSpice_Install\17.4.0\PSpice.ini file:
.lib "nom_pspti.lib" 
.lib "nom.lib" 

*Analysis directives: 
.TRAN  0 80u 0 0.01u 
.OPTIONS ADVCONV
.OPTIONS FILEMODELSEARCH
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*)) 
.INC "..\SCHEMATIC1.net" 



**** INCLUDING SCHEMATIC1.net ****
* source LM3488-SIM
X_U1         0 N01866 N01439 N01821 N01523 N01326 0 VIN LM3488_TRANS PARAMS:
+  SS={SS}
X_U2         N01458 N01439 N01387 CSD19538Q3A
L_L1         N01458 VIN  33u  
L_L2         N01467 0  33u  
C_C4         VIN 0  10u  
C_C5         0 VIN  0.1u  TC=0,0 
C_C6         0 N01866  510p  TC=0,0 
C_C7         0 N01901  0.1u  TC=0,0 
R_R1         N01901 N01866  1.3k TC=0,0 
R_R2         0 N01821  31.6k TC=0,0 
R_R3         0 VIN  10k TC=0,0 
C_C8         N01467 N01458  1u  TC=0,0 
C_C9         VOUT 0  47u IC={11.5*SS} 
R_R4         VOUT N01523  84.5k TC=0,0 
R_R5         N01523 0  10k TC=0,0 
R_R6         N01387 0  0.05 TC=0,0 
R_R7         N01326 N01387  100 TC=0,0 
C_C10         0 N01326  680p  TC=0,0 
V_V1         VIN 0 12Vdc
D_D1         N01467 VOUT Dbreak 
R_R8         VOUT 0  1 TC=0,0 
Kn_K1         L_L1 L_L2     1
.PARAM  ss=1

**** RESUMING "Steady State.cir" ****
.END

INFO(ORPSIM-15453): Model X_U2.NMOS: Using BSIM VERSION 3.2

**** 07/12/23 15:58:52 ******* PSpice 17.4.0 (Nov 2018) ******* ID# 0 ********

 ** Profile: "SCHEMATIC1-Steady State"  [ G:\Engineering\Simulations\lm3488-pspi


 ****     Diode MODEL PARAMETERS


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




               X_U2.DBD        
  T_Measured   25            
   T_Current   27            
          IS  500.000000E-15 
           N    1.06         
          BV  101            
          RS    4.000000E-03 
          TT    2.000000E-09 
         CJO    7.500000E-15 
          VJ     .5          
           M     .625        
         XTI    3.3          
        TRS1    4.000000E-03 


**** 07/12/23 15:58:52 ******* PSpice 17.4.0 (Nov 2018) ******* ID# 0 ********

 ** Profile: "SCHEMATIC1-Steady State"  [ G:\Engineering\Simulations\lm3488-pspi


 ****     MOSFET MODEL PARAMETERS


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




               X_U2.NMOS       X_U2.PMOSd      
               NMOS            PMOS            
  T_Measured   25              27            
   T_Current   27              27            
       LEVEL    7               1            
           L  100.000000E-06  100.000000E-06 
           W  100.000000E-06  100.000000E-06 
         VTO     .7             -.3          
          KP   51.797160E-06   51.797160E-06 
       GAMMA    0              10            
         PHI                     .954626     
      LAMBDA    0               0            
          IS    1.000000E-15   60.000000E-15 
          JS    0               0            
          PB    1                .8          
        PBSW    1                .8          
          CJ    1.000000E-18    1.000000E-18 
        CJSW    1.000000E-18    1.000000E-18 
        CGSO    1.000000E-18    1.000000E-18 
        CGDO    1.000000E-18    1.000000E-18 
        CGBO    1.000000E-18    0            
        NSUB   10.000000E+15    1.500000E+18 
         TOX   40.000000E-09   40.000000E-09 
          XJ  300.000000E-09    0            
       UCRIT   10.000000E+03   10.000000E+03 
       DELTA     .022                        
      DIOMOD    2               1            
         VFB   -1               0            
        LETA    0               0            
        WETA    0               0            
          U0  600               0            
        TEMP                    0            
         VDD                    5            
       XPART    0               0            
          UA   14.000000E-09                 
          UB    5.000000E-18                 
          UC  -46.500000E-12                 
        VSAT   80.000000E+03                 
        RDSW    0                            
        VOFF     .1                          
     NFACTOR    2                            
        PCLM     .25                         
      PDIBL1     .02                         
      PDIBL2    4.000000E-03                 
       DROUT     .9                          
      PSCBE1  300.000000E+06                 
      PSCBE2    1.000000E-06                 
          A0    1                            
          A1    0                            
          A2    1                            
       NPEAK  148.500000E+15                 
         VBM   -5                            
         LDD    0                            
        LITL  189.736700E-09                 
         KT1   -1.15                         
         UA1   25.000000E-12                 
         UB1 -800.000000E-21                 
         UC1  -56.000000E-12                 
        PVAG     .1                          
        ETA0    5.000000E-03                 
        KT1L    1.000000E-15                 
        DSUB    1.4                          
      MOBMOD    1                            
        PRWG    0                            
        LINT   55.000000E-09                 
         DLC   55.000000E-09                 
         DWC    0                            
          CF    0                            
        NOIA  100.000000E+18                 
        NOIB   50.000000E+03                 
        NOIC   -1.400000E-12                 
         VTM     .025692                     
     VERSION    3.2                          
       PBSWG    1                            
       MJSWG     .33                         
       CJSWG    1.000000E-18                 
       JTSCD    0                            
        TOXM   40.000000E-09                 
         LLC    0                            
         LWC    0                            
        LWLC    0                            
         WLC    0                            
         WWC    0                            
        WWLC    0                            


**** 07/12/23 15:58:52 ******* PSpice 17.4.0 (Nov 2018) ******* ID# 0 ********

 ** Profile: "SCHEMATIC1-Steady State"  [ G:\Engineering\Simulations\lm3488-pspi


 ****     Resistor MODEL PARAMETERS


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




               X_U2.RTEMP      
           R    1            
         TC1    6.000000E-03 
         TC2   20.000000E-06 


**** 07/12/23 15:58:52 ******* PSpice 17.4.0 (Nov 2018) ******* ID# 0 ********

 ** Profile: "SCHEMATIC1-Steady State"  [ G:\Engineering\Simulations\lm3488-pspi


 ****     INITIAL TRANSIENT SOLUTION       TEMPERATURE =   27.000 DEG C


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



 NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE


(  VIN)   12.0000  ( VOUT)   11.4770  (N01326)-625.9E-06 (N01387)-312.8E-09     

(N01439) 28.79E-12 (N01458)   12.0000 (N01467)-855.5E-18 (N01523)    1.2145     

(N01821)     .9693 (N01866)    1.6929 (N01901)    1.6929 (X_U2.4)   12.0000     

(X_U2.5) 28.79E-12 (X_U2.6)-312.8E-09 (X_U2.7)   12.0000 (X_U2.8)-312.8E-09     

(X_U2.9)-312.8E-09 (X_U1.FA)     .9693                   (X_U1.OC)    0.0000    

(X_U1.OV)    0.0000                   (X_U1.SS) 1.701E-06                       

(X_U2.10)   12.0000                   (X_U2.11) 28.79E-12                       

(X_U2.12)-312.8E-09                   (X_U1.CLK)     .2000                      

(X_U1.OC1)    0.0000                  (X_U1.OC2)    0.0000                      

(X_U1.REF) 1.701E-06                  (X_U1.SET)    0.0000                      

(X_U1.VCC)    7.1811                  (X_U1.RAMP)    -.0625                     

(X_U1.UVLO)    2.5000                 (X_U1.V7P2)    7.1811                     

(X_U1.FBVAL)    1.2145                (X_U1.OCDLY)    0.0000                    

(X_U1.RESET)    1.0000                (X_U1.X_U2.3)    0.0000                   

(X_U1.X_U2.5) 24.38E-06               (X_U1.X_U7.1)    1.0000                   

(X_U2.xcds.5)   12.0000               (X_U2.xcds.6) 94.50E-12                   

(X_U2.xcds.7)    0.0000               (X_U2.xcds.8)    0.0000                   

(X_U2.xcgd.5)   12.0000               (X_U2.xcgd.6) 11.40E-12                   

(X_U2.xcgd.7)    0.0000               (X_U2.xcgd.8)    0.0000                   

(X_U1.DRVRSIG)   -3.0000              (X_U1.OSCSHUT)    0.0000                  

(X_U1.PWM_CLK)    0.0000              (X_U1.VGM_REF)    1.2600                  

(X_U1.X_U2.12)    0.0000              (X_U1.X_U2.13)     .0619                  

(X_U1.COMP_NEG)     .3589             (X_U1.COMP_POS)-625.9E-06                 

(X_U1.X_U2.FSW) 476.0E+03             (X_U1.N16850239)    0.0000                

(X_U1.N16855996)   -3.0000            (X_U1.N16875644)    1.0000                

(X_U1.N16907101)    0.0000            (X_U1.N16908277)    1.0000                

(X_U1.N16909753)    1.0000            (X_U1.N16926804)    2.8500                

(X_U1.N16927149)     .1700            (X_U1.N16930285)    1.0000                

(X_U1.N16931482)    1.0000            (X_U1.N16943331)    2.8000                

(X_U1.N16943348)    2.3820            (X_U1.N16945907)    0.0000                

(X_U1.N16966720)    1.0000            (X_U1.X_U10.MY5)    1.0000                

(X_U1.X_U10.Qbr)    1.0000            (X_U1.X_U10.Qqq) 2.002E-15                

(X_U1.X_U2.0P1V)    0.0000            (X_U1.X_U3.YINT)    1.0000                

(X_U1.X_U5.YINT)    1.0000            (X_U1.X_U6.YINT)    1.0000                

(X_U1.X_U7.INM1)   -9.1500            (X_U1.X_U7.INP1)    0.0000                

(X_U1.X_U7.INP2)     .1700            (X_U1.FB_NOSPIKE)    1.2145               

(X_U1.X_erramp.1)    1.4108           (X_U1.X_erramp.2)     .0455               

(X_U1.X_erramp.3)    1.4108           (X_U1.X_erramp.4)    1.4108               

(X_U1.X_erramp.5)    1.4108           (X_U1.X_erramp.9)    1.4108               

(X_U1.X_U10.Qint) 2.002E-15           (X_U1.X_U2.FABY5)    0.0000               

(X_U1.X_U2.FAINT)     .9693           (X_U1.X_erramp.10)    5.0000              

(X_U1.X_erramp.11)    1.3000          (X_U1.X_U1.TONMIN)    0.0000              

(X_U1.X_U10.MYVSS)    0.0000          (X_U1.X_U10.Qqqd1)    0.0000              

(X_U1.X_U137.YINT)    0.0000          (X_U1.X_U2.FA_GEN)    1.0000              

(X_U1.X_U2.VCO_SQ)    0.0000          (X_U1.X_U1.TON325N) 2.016E-15             

(X_U1.FA_SD_30UHIGH)    0.0000        (X_U1.X_U10.X3.YINT)    0.0000            

(X_U1.X_U2.SAWTOOTH) 59.15E-09        (X_U1.X_U1.N16793493)    1.0000           

(X_U1.X_U1.N16793497)    1.0000       (X_U1.X_U1.N16793552)    1.0000           

(X_U1.X_U1.N16795506)    1.0000       (X_U1.X_U1.X_U17.MY5)    5.0000           

(X_U1.X_U1.X_U17.Qbr)    1.0000       (X_U1.X_U1.X_U17.Qqq) 10.00E-15           

(X_U1.X_U2.FA_SD_INT)    0.0000       (X_U1.X_U2.N16789125)    0.0000           

(X_U1.X_U2.N16819994) 476.0E+03       (X_U1.X_U2.N16828837)    0.0000           

(X_U1.X_U2.N16832334)    0.0000       (X_U1.X_U2.N16834021)    1.0000           

(X_U1.X_U2.X_U10.MY5)    1.0000       (X_U1.X_U2.X_U10.Qbr)    1.0000           

(X_U1.X_U2.X_U10.Qqq) 2.002E-15       (X_U1.X_U2.X_U2.YINT)    0.0000           

(X_U1.X_U1.N167973070)    1.0000      (X_U1.X_U1.X_U17.Qint) 10.00E-15          

(X_U1.X_U2.X_U10.Qint) 2.002E-15      (X_U1.X_U2.X_U788.INT) 41.30E-24          

(X_U1.X_U1.X_U137.YINT)    1.0000     (X_U1.X_U1.X_U138.YINT)    1.0000         

(X_U1.X_U1.X_U17.Qqqd1)    0.0000     (X_U1.X_U2.X_U10.MYVSS)    0.0000         

(X_U1.X_U2.X_U10.Qqqd1)    0.0000     (X_U1.X_U1.X_U17.CLKdel)    1.0000        

(X_U1.X_U1.X_U17.CLKint)    0.0000    (X_U1.X_U1.X_U17.X2.YINT)    0.0000       

(X_U1.X_U2.X_U10.X3.YINT)    0.0000   (X_U1.X_U1.X_U17.X1.YINT1)    0.0000      

(X_U1.X_U1.X_U17.X1.YINT2)    0.0000  (X_U1.X_U1.X_U17.X1.YINT3)    1.0000      

(X_U1.X_U1.X_U17.X3.YINT1)    0.0000  (X_U1.X_U1.X_U17.X3.YINT2)    0.0000      

(X_U1.X_U1.X_U17.X3.YINT3)    0.0000  (X_U1.X_U2.X_U788.X_U1.YINT)    0.0000    

(X_U1.X_U2.X_U788.X_U22.YINT)    1.0000                                         

(X_U1.X_U2.X_U788.IN_B_DELAYED)    1.0000                




    VOLTAGE SOURCE CURRENTS
    NAME         CURRENT

    V_V1        -1.205E-03
    X_U1.V_Iss_tst   8.505E-04
    X_U1.V_V3   -6.901E-13
    X_U1.V_V2    0.000E+00
    X_U1.V_V1    0.000E+00
    X_U1.V_IFA   3.067E-05
    X_U1.X_U10.V1  -1.001E-12
    X_U1.X_U10.V2   2.776E-27
    X_U1.X_U1.V_V2  -1.010E-12
    X_U1.X_U1.V_V1   0.000E+00
    X_U1.X_erramp.V2   4.029E-13
    X_U1.X_erramp.V5  -3.599E-12
    X_U1.X_U2.V_IFA   3.067E-05
    X_U1.X_U2.V_p1V  -5.919E-18
    X_U2.xcgd.v1   0.000E+00
    X_U2.xcds.v1   0.000E+00
    X_U1.X_U1.X_U17.V1  -5.001E-12
    X_U1.X_U2.X_U10.V1  -1.001E-12
    X_U1.X_U2.X_U10.V2   2.776E-27

    TOTAL POWER DISSIPATION   1.45E-02  WATTS

Reducing minimum delta to make the circuit converge.
Reducing minimum delta to make the circuit converge.

ERROR(ORPSIM-15138): Convergence problem in Transient Analysis at Time =  1.050E-06.
         Time step =  376.1E-21, minimum allowable step size =  1.000E-18

  These voltages failed to converge:

    V(N01458)                 =    3.754GV  \   -3.993mV
    V(N01467)                 =    3.754GV  \    -11.89V
    V(N01387)                 =    3.449GV  \   -2.753mV
    V(N01326)                 =   172.14mV  \    19.55mV
    V(X_U1.N16855996)         =     26.06V  \     10.18V
    V(N01439)                 =     23.06V  \     7.181V
    V(X_U1.DRVRSIG)           =     26.06V  \     10.18V
    V(X_U1.COMP_POS)          =   172.14mV  \    19.55mV
    V(X_U2.10)                =   -10.00GV  \     18.51V
    V(X_U2.11)                =   -10.00GV  \     25.62V
    V(X_U2.12)                =   -10.00GV  \     18.42V
    V(X_U2.5)                 =    7.389GV  \     7.115V
    V(X_U2.8)                 =    3.452GV  \   -2.522mV
    V(X_U2.9)                 =   -10.00GV  \     9.208V
    V(X_U2.6)                 =    3.452GV  \   -2.689mV
    V(X_U2.7)                 =   -10.00GV  \     18.53V
    V(X_U2.4)                 =   -10.00GV  \     18.53V
    V(X_U2.xcgd.5)            =  -305.72MV  \    1.240mV
    V(X_U2.xcgd.6)            =    3.057mV  \    50.39pV
    V(X_U2.xcgd.8)            =    10.00GV  \   -78.85mV
    V(X_U2.xcds.5)            =  -305.72MV  \    1.240mV
    V(X_U2.xcds.6)            =    26.29mV  \   453.89pV
    V(X_U2.xcds.8)            =    10.00GV  \   -78.85mV

  These supply currents failed to converge:

    I(X_U1.E_Edriver)         =    1.150uA  \  -419.46nA
    I(X_U1.E_E_bias)          =     10.59A  \    39.94uA
    I(X_U1.E_GAIN3)           =    22.78uA  \    25.32uA
    I(X_U2.xcgd.e1)           =    305.72A  \   -1.240nA
    I(X_U2.xcgd.e2)           =   -3.057nA  \ -50.39e-18A
    I(X_U2.xcgd.e3)           =   -1.248MA  \    78.85nA
    I(X_U2.xcds.e1)           =    305.72A  \   -1.240nA
    I(X_U2.xcds.e2)           =   -26.29nA  \ -453.89e-18A
    I(X_U2.xcds.e3)           =   -1.248MA  \    78.85nA
    I(L_L1)                   =         0A  \   -115.00A
    I(L_L2)                   =  -371.32mA  \    114.63A
    I(X_U2.LGG)               =    -10.59A  \   -40.00uA
    I(X_U2.L)                 =   392.43mA  \   371.30mA
    I(X_U2.LDD)               =    17.54MA  \   371.47mA
    I(V_V1)                   =    7.181uA  \   -115.00A
    I(X_U2.xcgd.v1)           =    10.00GA  \   -78.85mA
    I(X_U2.xcds.v1)           =    10.00GA  \   -78.85mA
    I(X_U1.X_U1.X_U17.V1)     =    1.897uA  \    1.900uA

  These devices failed to converge:
    D_D1      X_U2.DBD  X_U1.E_E_OC X_U2.xcgd.e1 X_U2.xcgd.e2 X_U2.xcds.e1 
    X_U2.xcds.e2 X_U2.xcgd.g1 X_U2.xcds.g1 X_U1.M_M1 



  Last node voltages tried were:

 NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE


(  VIN)   12.0000  ( VOUT)   11.2260  (N01326)     .1721 (N01387) 3.449E+09     

(N01439)   23.0610 (N01458) 3.754E+09 (N01467) 3.754E+09 (N01523)    1.1879     

(N01821)     .9693 (N01866)    1.7011 (N01901)    1.6929 (X_U2.4)-10.00E+09     

(X_U2.5) 7.389E+09 (X_U2.6) 3.452E+09 (X_U2.7)-10.00E+09 (X_U2.8) 3.452E+09     

(X_U2.9)-10.00E+09 (X_U1.FA)     .9693                   (X_U1.OC)    0.0000    

(X_U1.OV)    0.0000                   (X_U1.SS) 894.7E-06                       

(X_U2.10)-10.00E+09                   (X_U2.11)-10.00E+09                       

(X_U2.12)-10.00E+09                   (X_U1.CLK)     .2000                      

(X_U1.OC1)    0.0000                  (X_U1.OC2)    0.0000                      

(X_U1.REF) 894.7E-06                  (X_U1.SET)    0.0000                      

(X_U1.VCC)    7.1811                  (X_U1.RAMP)     .7189                     

(X_U1.UVLO)    2.5000                 (X_U1.V7P2)    7.1811                     

(X_U1.FBVAL)    1.1879                (X_U1.OCDLY)    0.0000                    

(X_U1.RESET)    1.0000                (X_U1.X_U2.3)    0.0000                   

(X_U1.X_U2.5) 24.38E-06               (X_U1.X_U7.1)    1.0000                   

(X_U2.xcds.5)-305.7E+06               (X_U2.xcds.6)     .0263                   

(X_U2.xcds.7)    0.0000               (X_U2.xcds.8) 10.00E+09                   

(X_U2.xcgd.5)-305.7E+06               (X_U2.xcgd.6)     .0031                   

(X_U2.xcgd.7)    0.0000               (X_U2.xcgd.8) 10.00E+09                   

(X_U1.DRVRSIG)   26.0610              (X_U1.OSCSHUT)    0.0000                  

(X_U1.PWM_CLK)    1.0000              (X_U1.VGM_REF)    1.2600                  

(X_U1.X_U2.12)    0.0000              (X_U1.X_U2.13)     .0619                  

(X_U1.COMP_NEG)     .3172             (X_U1.COMP_POS)     .1721                 

(X_U1.X_U2.FSW) 476.0E+03             (X_U1.N16850239)    0.0000                

(X_U1.N16855996)   26.0610            (X_U1.N16875644)    1.0000                

(X_U1.N16907101)    0.0000            (X_U1.N16908277)    1.0000                

(X_U1.N16909753)    1.0000            (X_U1.N16926804)    2.8500                

(X_U1.N16927149)     .1700            (X_U1.N16930285)    1.0000                

(X_U1.N16931482)    1.0000            (X_U1.N16943331)    2.8000                

(X_U1.N16943348)    2.3820            (X_U1.N16945907)    0.0000                

(X_U1.N16966720)    1.0000            (X_U1.X_U10.MY5)    1.0000                

(X_U1.X_U10.Qbr)    1.0000            (X_U1.X_U10.Qqq)    -.0563                

(X_U1.X_U2.0P1V)     .1000            (X_U1.X_U3.YINT)    1.0000                

(X_U1.X_U5.YINT)    1.0000            (X_U1.X_U6.YINT)    1.0000                

(X_U1.X_U7.INM1)   -9.1500            (X_U1.X_U7.INP1)    0.0000                

(X_U1.X_U7.INP2)     .1700            (X_U1.FB_NOSPIKE)    1.1902               

(X_U1.X_erramp.1)    2.0050           (X_U1.X_erramp.2)     .0647               

(X_U1.X_erramp.3)    2.0050           (X_U1.X_erramp.4)    2.0204               

(X_U1.X_erramp.5)    2.0204           (X_U1.X_erramp.9)    2.0050               

(X_U1.X_U10.Qint)    -.0563           (X_U1.X_U2.FABY5)    0.0000               

(X_U1.X_U2.FAINT)     .9693           (X_U1.X_erramp.10)    5.0000              

(X_U1.X_erramp.11)    1.3000          (X_U1.X_U1.TONMIN)    1.0000              

(X_U1.X_U10.MYVSS)    0.0000          (X_U1.X_U10.Qqqd1)    0.0000              

(X_U1.X_U137.YINT)    0.0000          (X_U1.X_U2.FA_GEN)    1.0000              

(X_U1.X_U2.VCO_SQ)-212.7E-06          (X_U1.X_U1.TON325N)    1.0542             

(X_U1.FA_SD_30UHIGH)    0.0000        (X_U1.X_U10.X3.YINT)    0.0000            

(X_U1.X_U2.SAWTOOTH)     .4808        (X_U1.X_U1.N16793493)    1.0000           

(X_U1.X_U1.N16793497)    0.0000       (X_U1.X_U1.N16793552)    1.0000           

(X_U1.X_U1.N16795506)    0.0000       (X_U1.X_U1.X_U17.MY5)    5.0000           

(X_U1.X_U1.X_U17.Qbr)    0.0000       (X_U1.X_U1.X_U17.Qqq)    5.0560           

(X_U1.X_U2.FA_SD_INT)    0.0000       (X_U1.X_U2.N16789125)    0.0000           

(X_U1.X_U2.N16819994) 476.0E+03       (X_U1.X_U2.N16828837)    0.0000           

(X_U1.X_U2.N16832334)    0.0000       (X_U1.X_U2.N16834021)    1.0000           

(X_U1.X_U2.X_U10.MY5)    1.0000       (X_U1.X_U2.X_U10.Qbr)    1.0000           

(X_U1.X_U2.X_U10.Qqq)    -.0563       (X_U1.X_U2.X_U2.YINT)    0.0000           

(X_U1.X_U1.N167973070)    1.0000      (X_U1.X_U1.X_U17.Qint)    5.0560          

(X_U1.X_U2.X_U10.Qint)    -.0563      (X_U1.X_U2.X_U788.INT)     .0090          

(X_U1.X_U1.X_U137.YINT)    1.0000     (X_U1.X_U1.X_U138.YINT)    0.0000         

(X_U1.X_U1.X_U17.Qqqd1)    1.0000     (X_U1.X_U2.X_U10.MYVSS)    0.0000         

(X_U1.X_U2.X_U10.Qqqd1)    0.0000     (X_U1.X_U1.X_U17.CLKdel)    1.0000        

(X_U1.X_U1.X_U17.CLKint)    0.0000    (X_U1.X_U1.X_U17.X2.YINT)    0.0000       

(X_U1.X_U2.X_U10.X3.YINT)    0.0000   (X_U1.X_U1.X_U17.X1.YINT1)    0.0000      

(X_U1.X_U1.X_U17.X1.YINT2) 153.1E-24  (X_U1.X_U1.X_U17.X1.YINT3)    1.0000      

(X_U1.X_U1.X_U17.X3.YINT1)    1.0000  (X_U1.X_U1.X_U17.X3.YINT2)    1.0000      

(X_U1.X_U1.X_U17.X3.YINT3)    1.0000  (X_U1.X_U2.X_U788.X_U1.YINT)    0.0000    

(X_U1.X_U2.X_U788.X_U22.YINT)    1.0000                                         

(X_U1.X_U2.X_U788.IN_B_DELAYED)     .0738                


**** Interrupt ****

  • 0
    TI__Mastermind 29900 points

    Hi Luke,

    Thanks for using the e2e forum.

    Looking at the error log, it says the components U2 (FET) and D1 (diode) do not achieve convergence.
    The diode is already an ideal part from the library, therefore I would recommend to have a look on the imported FET model.

    The fastest check would be replacing the FET with a generic FET model from the library an check if the simulation converges.
    This should also allow you to place more probes, as there will be no more third-party models within in the schematic.

    If the convergence error persists, I would recommend to relax the simulation settings:
    You will find the convergence settings in the bar on the top in "Edit Simulation Profile" -> Options -> Analog Simulation -> General
    For example, the following settings should improve convergence:

    Reducing GMIN (to 1.0E-14 for example)
    Increasing ITL4 (to 40 for example)
    Increasing VNTOL or ABSTOL by one or two orders of magnitude
    There is also an autoconverge feature, which forces the simulator into a steady state point. This may affect accuracy even stronger, so proceed with caution.
    You can also reduce the maximum stepsize. This will increase simulation time, but helps the simulator once the simulation is running.
    Please let me know if you need additional help.
    Best regards,
    Niklas
  • 0 in reply to Niklas Schwarz
    Prodigy 40 points

    Hi Niklas,

    Thanks for the quick response. The CSD15938 FET was chosen based on a WEBENCH reference design. That mode came as part of the PSICE for TI installed libraries.

    I removed it and placed the power_Mbreakn component. The simulation did not run. Again failing with convergence errors.

    I applied the values you mentioned but the errors have not resolved.

    I do have the reference design for this IC simulating correctly but the topology is not correct for my application. It's not clear to me how to resolve the convergence error. Do I persist with modifying the circuit until this error goes away ?

  • 0 in reply to Luke Faggion
    TI__Mastermind 29900 points

    Hi Luke,

    Thanks for the feedback and additional details.

    In general, I would try fixing the error with the component selection first. You can always "force" the simulation into convergence, but this often comes at a loss in accuracy.
    The schematic itself looks good to me, so I cannot find an issue here.
    Like you already mentioned, the default testbench only has a boost topology, but it could still be a useful approach to start with the functioning boost model and modify it step by step to reach the desired SEPIC design.

    If the convergence error persist in the SEPIC design, you can send me your modeling files in a .zip and I can try to debug the model from my side as well.

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 40 points

    Hi Niklas,

    Thanks, I'll continue to modify component selection and compare with the reference design. If I don't make any progress, I'll update with the zip of my modelling files.

    Cheers,

    LF