Texas Instruments TPS54331 PSpice simulation convergence issue

fravelalon · Mar 17, 2015

Hi, I'm developing a step down converting circuit using the Texas Instrument Converter TPS54331. I imported the PSpice model of the component and draw the circuit, but when i launch the simulation the sequent error appears: ERROR -- Convergence problem in bias point calculation

Please, can anyone help?
Thank you

This is the schematic:

And this are the results of the simulation:

**** 03/17/15 10:15:08 ***** PSpice 16.6.0 (October 2012) ***** ID# 0 ********

** Profile: "SCHEMATIC1-bias" [ C:\Users\Marco\Documents\Cubesat\5v@2,2a-pspicefiles\schematic1\bias.sim ]

**** CIRCUIT DESCRIPTION

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

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

*Libraries:
* Profile Libraries :
.INC "C:\Users\Marco\Documents\Cubesat\5v@2,2a-pspicefiles\schematic1\bias\bias_profile.inc"
* Local Libraries :
* From [PSPICE NETLIST] section of C:\Users\Marco\AppData\Roaming\SPB_Data\cdssetup\OrCAD_PSpice/16.6.0/PSpice.ini file:

**** INCLUDING bias_profile.inc ****
.LIB ".\tps54331_trans.lib"

**** RESUMING bias.cir ****
.lib "nom.lib"

*Analysis directives:
.OP
.OPTIONS ADVCONV
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"

**** INCLUDING SCHEMATIC1.net ****
* source 5V@2,2A
X_U1 N14484 N14621 N15225 0 N14488 N15089 N15229 N14774 TPS54331_TRANS
C_C1 N14484 N14488 0.1n TC=0,0
D_D1 0 N14488 Dbreak
L_L1 N14488 N14499 12uH
C_C2 0 N14499 47n TC=0,0
C_C3 N14621 N14656 5600p TC=0,0
C_C4 N14621 0 120p TC=0,0
R_R1 N14656 0 12.4k TC=0,0
R_R2 N14774 N14499 10k TC=0,0
R_R3 0 N14774 1.87k TC=0,0
C_C5 0 N15089 0.015n TC=0,0
R_R4 N15225 N15229 348k TC=0,0
R_R5 0 N15225 76.8k TC=0,0
C_C6 0 N15229 10n TC=0,0
C_C7 0 N15229 10n TC=0,0
V_V1 N15229 0 12Vdc
C_C8 0 N14499 47n TC=0,0
R_R6 0 N14499 10 TC=0,0

**** RESUMING bias.cir ****
.END

**** 03/17/15 10:15:08 ***** PSpice 16.6.0 (October 2012) ***** ID# 0 ********

** Profile: "SCHEMATIC1-bias" [ C:\Users\Marco\Documents\Cubesat\5v@2,2a-pspicefiles\schematic1\bias.sim ]

**** Diode MODEL PARAMETERS

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

Dbreak MBR340
IS 10.000000E-15 823.900000E-09
ISR 838.600000E-09
IKF .5654
RS .1 .01827
CJO 100.000000E-15 477.200000E-12
VJ .75
M .4787
XTI 0

ERROR -- Convergence problem in bias point calculation

Last node voltages tried were:

NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE

(N14484) 6.0000 (N14488) 33.88E-06 (N14499) 32.15E-06 (N14621) .2496

(N14656) 69.41E-06 (N14774) 5.064E-06 (N15089) .0155 (N15225) 1.1164

(N15229) 6.0000 (X_U1.OC) 131.8E-09 (X_U1.SD) 2.5000

(X_U1.2P5) 0.0000 (X_U1.CLK) 0.0000

(X_U1.ECO) 0.0000 (X_U1.ENREGS) 0.0000

(X_U1.N67875) 0.0000 (X_U1.N67893) 0.0000

(X_U1.N67911) 0.0000 (X_U1.N67943) 0.0000

(X_U1.N68245) 0.0000 (X_U1.N68385) 2.5000

(X_U1.U42_QN) 2.5000 (X_U1.U42_IN1) 0.0000

(X_U1.U45_IN2) 0.0000 (X_U1.U45_IN3) 0.0000

(X_U1.U45_IN4) 0.0000 (X_U1.U45_IN5) 0.0000

(X_U1.VREF_GM) 0.0000 (X_U1.U40_N14704) 0.0000

(X_U1.U41_N00409) 0.0000 (X_U1.U41_N02173) .8000

(X_U1.U41_N03360) -.0012 (X_U1.U41_N14122) .2500

(X_U1.U42_N00618) 6.0000 (X_U1.U42_N00718) 0.0000

(X_U1.U42_N00836) 6.0000 (X_U1.U42_N01108) 33.94E-06

(X_U1.U42_N01674) 0.0000 (X_U1.U42_N04959) 2.5000

(X_U1.U43_N00392) 0.0000 (X_U1.U43_N01530) 0.0000

(X_U1.U43_N01763) 0.0000 (X_U1.U43_N02091) 0.0000

(X_U1.U43_N02780) 0.0000 (X_U1.U45_N00466) .0325

(X_U1.U45_N00859) 0.0000 (X_U1.U45_N05307) 2.5000

(X_U1.U47_N00154) 0.0000 (X_U1.U48_N19630) 2.5000

(X_U1.X_U46.YINT) 0.0000 (X_U1.U42_N14330309) 86.64E-21

(X_U1.U42_N14330317) 2.5000 (X_U1.U42_N14330321) 0.0000

(X_U1.U42_N14330333)-215.6E-21 (X_U1.U42_N14374249) 0.0000

(X_U1.U42_N14378229) .4000 (X_U1.U42_N14379753) 0.0000

(X_U1.X_U42_U4.YINT) 0.0000 (X_U1.X_U42_U6.YINT) 0.0000

(X_U1.X_U42_U8.YINT) 0.0000 (X_U1.X_U42_U5.YINT1) 0.0000

(X_U1.X_U42_U5.YINT2) 0.0000 (X_U1.X_U42_U5.YINT3) 2.5000

(X_U1.X_U43_U3.YINT1) 0.0000 (X_U1.X_U43_U3.YINT2) 0.0000

(X_U1.X_U43_U3.YINT3) 0.0000 (X_U1.X_U42_U_DFF1.my5) 2.5000

(X_U1.X_U42_U_DFF1.qbr) 2.5000 (X_U1.X_U42_U_DFF1.qqq) -.0087

(X_U1.X_U42_U_DFF1.qint) -.2167 (X_U1.X_U45_U_INV1.YINT) 2.5000

(X_U1.X_U42_U_DFF1.qqqd1) 0.0000 (X_U1.X_U42_U_DFF1.clkdel) 2.5000

(X_U1.X_U42_U_DFF1.clkint) 0.0000 (X_U1.X_U42_U_DFF1.x2.YINT) 0.0000

(X_U1.X_U42_U_DFF1.x1.YINT1) 0.0000

(X_U1.X_U42_U_DFF1.x1.YINT2) 0.0000

(X_U1.X_U42_U_DFF1.x1.YINT3) 2.5000

(X_U1.X_U42_U_DFF1.x3.YINT1) 0.0000

(X_U1.X_U42_U_DFF1.x3.YINT2) 0.0000

(X_U1.X_U42_U_DFF1.x3.YINT3) 0.0000

These voltages failed to converge:

V(N14488) = 32.15uV \ 33.88uV
V(X_U1.SD) = 5.000V \ 2.500V
V(X_U1.U48_N19630) = 5.000V \ 2.500V
V(X_U1.U47_N00154) = -3.643V \ 0V
V(X_U1.N68385) = 5.000V \ 2.500V
V(X_U1.X_U45_U_INV1.YINT) = 5.000V \ 2.500V
V(X_U1.U42_N14330317) = 2.503V \ 2.500V
V(X_U1.U42_N01108) = 32.21uV \ 33.94uV
V(X_U1.X_U42_U_DFF1.qint) = -139.94mV \ -216.70mV
V(X_U1.X_U42_U_DFF1.qqq) = -5.598mV \ -8.668mV
V(X_U1.X_U42_U_DFF1.qbr) = 5.000V \ 2.500V
V(X_U1.U42_QN) = 2.503V \ 2.500V
V(X_U1.X_U42_U5.YINT3) = 5.000V \ 2.500V
V(X_U1.X_U42_U_DFF1.x1.YINT3) = 5.000V \ 2.500V
V(X_U1.X_U42_U_DFF1.clkdel) = 2.503V \ 2.500V

These supply currents failed to converge:

I(X_U1.E_U44_ABM5) = 144.26mA \ 36.06mA
I(X_U1.E_U48_ABM11) = -5.005nA \ -2.503nA
I(X_U1.E_U47_ABM1) = 3.646nA \ 0A
I(X_U1.X_U45_U_INV1.E_ABMGATE) = -2.500A \ -152.50nA
I(X_U1.X_U42_U_DFF1.eqb) = -2.497A \ -10.00nA
I(X_U1.X_U42_U5.E_ABMGATE2) = -2.497A \ -10.00nA
I(X_U1.X_U42_U_DFF1.x1.E_ABMGATE2) = -2.497A \ -10.00nA
I(L_L1) = 3.026uA \ 3.256uA
I(V_V1) = -18.18uA \ -18.41uA
I(X_U1.V_U43_V7) = 6.000pA \ 24.00pA
I(X_U1.V_U43_V8) = -85.87uA \ -42.93uA
I(X_U1.V_U43_V6) = -144.26mA \ -36.07mA
I(X_U1.V_U42_V11) = 132.98nA \ 135.58nA
I(X_U1.X_U43_F1.VF_U43_F1) = 85.87uA \ 21.47uA
I(X_U1.X_U42_H1.VH_U42_H1) = 3.231uA \ 3.296uA
I(X_U1.X_U42_F2.VF_U42_F2) = 3.231uA \ 3.296uA

These devices failed to converge:
X_U1.X_U48_D9.d1 X_U1.X_U42_U_DFF1.d_d11 X_U1.E_U47_ABM1

**** Interrupt ****

mvaseem · Mar 19, 2015

Can you also attach "tps54331_trans.lib" file. Need this to try it out at my end.

fravelalon · Mar 19, 2015

I made some changes in the values of the capacitors, because I found out they were wrong, but still have the convergence issue. I've attached the entire archive of my project below.

There you can download the TPS54331 Pspice model that I used:
www.ti.com/lit/zip/slvm659

Thank you

mvaseem said:
Can you also attach "tps54331_trans.lib" file. Need this to try it out at my end.

mvaseem · Mar 20, 2015

Your design converges successfully at my end without making any change. I am using 16.6 Pspice version - latest ISR.
Not sure what version you are using?
Your end goal must be to run transient simulation. For that you can proceed with transient directly (choose "Skip Bias point" option). Also relax RELTOl from 0.001 -> 0.005.

- - - Updated - - -

fravelalon · Mar 20, 2015

Thank you very much! What if I want the steady state solution? If I raise the run to time value it gives me back the same convergence error. Moreover I would expect to have a voltage value of 5V where I put the marker (see image) instead, after 1.0us I have 3.8mV

mvaseem said:
Your design converges successfully at my end without making any change. I am using 16.6 Pspice version - latest ISR.
Not sure what version you are using?
Your end goal must be to run transient simulation. For that you can proceed with transient directly (choose "Skip Bias point" option). Also relax RELTOl from 0.001 -> 0.005.

- - - Updated - - -

mvaseem · Mar 21, 2015

I get the results where output reaches steady state (around 5V). The time to reach steady state is different for both cases (with skipbp and without). In both cases I used RELTOL=0.005
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Texas Instruments TPS54331 PSpice simulation convergence issue

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Texas Instruments TPS54331 PSpice simulation convergence issue

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