pspice experts plz help me!!

[grittinjames]

failed to converge, pspice

Hi,
I am trying to simulate 555 in pspice.But disappointing I am getting an error like thius
--------------- Simulation Profile: SCHEMATIC1-ne55 ---------------
Simulation running...
** Profile: "SCHEMATIC1-ne55" [ D:\orcad\ne555-PSpiceFiles\SCHEMATIC1\ne55.sim ]
Reading and checking circuit
Circuit read in and checked, no errors
Calculating bias point for Transient Analysis
Starting GMIN stepping
Starting power supply stepping
Convergence problem in transient bias point calculation
These voltages failed to converge:
V(N00504) = -14.82V \ 5.412V
V(N00477) = -14.82V \ 5.412V
V(X_U1.1) = 2.339V \ 1.306V
V(X_U1.13) = 4.305V \ 2.404V
V(X_U1.3) = 85.45KV \ -24.49KV
5 of 5 errors shown. See output file for complete list...
These supply currents failed to converge:
I(X_U1.E_EMIR) = -21.46uA \ 827.62uA
I(X_U1.E_U6_E1CMP) = -8.545mA \ 2.449mA
I(X_U1.E_U7_E1CMP) = 9.037mA \ -1.957mA
I(X_U1.E_U7_E1) = -9.037mA \ 1.956mA
I(V_V1) = -17.59mA \ 2.644mA
5 of 5 errors shown. See output file for complete list...
These devices failed to converge:
X_U1.D_U6_D1CLMP
X_U1.D_U7_D2CLMP
X_U1.M_U2_U1_M4
X_U1.M_U2_U1_M3
5 of 5 errors shown. See output file for complete list...
Discontinuing simulation due to convergence problem
Simulation paused
Simulation running...
Starting GMIN stepping
Starting power supply stepping
Convergence problem in transient bias point calculation
These voltages failed to converge:
V(N00504) = -14.82V \ 5.412V
V(N00477) = -14.82V \ 5.412V
V(X_U1.1) = 2.339V \ 1.306V
V(X_U1.13) = 4.305V \ 2.404V
V(X_U1.3) = 85.45KV \ -24.49KV
5 of 5 errors shown. See output file for complete list...
These supply currents failed to converge:
I(X_U1.E_EMIR) = -21.46uA \ 827.62uA
I(X_U1.E_U6_E1CMP) = -8.545mA \ 2.449mA
I(X_U1.E_U7_E1CMP) = 9.037mA \ -1.957mA
I(X_U1.E_U7_E1) = -9.037mA \ 1.956mA
I(V_V1) = -17.59mA \ 2.644mA
5 of 5 errors shown. See output file for complete list...
These devices failed to converge:
X_U1.D_U6_D1CLMP
X_U1.D_U7_D2CLMP
X_U1.M_U2_U1_M4
X_U1.M_U2_U1_M3
5 of 5 errors shown. See output file for complete list...
Discontinuing simulation due to convergence problem
Simulation paused

Wt i shuld do for this

 

[_TopGun_]

these devices failed to converge:

First of all, you have to look at the simulator's output log.
In directory of your netlist (D:\orcad\ne555-PSpiceFiles\SCHEMATIC1\) there should be a file named "ne55.log" or "ne55.lis". It will contain detailed simulation description.

Also I see this in your log:

Discontinuing simulation due to convergence problem

It means that simulation was started, but simulator couldn't solve internal system of equations.
You can help him by setting some additional options in netlist. For more details, look the OrCAD documentation for "newton iterations count" (as I rememeber, it's itl4 option in netlist). Try to set it to 100 or 1000.