Um10155 & pspice

AIS · 5th November 2009, 07:51 PM

Has anyone got the UM10155 to run in Cadence PSPICE?
I only get the "ERROR -- Convergence problem in transient bias point calculation" and I just can't get past it.

sawreyrw · 5th November 2009, 08:07 PM

You need to "use initial conditions" for your transient solution. You probably need to mess with this some, and set certain node voltages and device currents to nonzero values. On the other hand it may work with only "uic" set.

ttako · 6th November 2009, 09:18 PM

Did you use Load?
I mean a 4 ohm resistor as a basic model of the speaker to load the amp?
Sometimes it helps...

BR,

Tamas

AIS · 6th November 2009, 10:18 PM

Yes, I used a resistive load (however, interesting to see the UcD’s ability to drive capacitive and inductive loads).

I got it to simulate with the SKIPBP checked (UiC), lowered the maximum step size, STEPGMIN checked and auto converged checked. I also needed to put initial voltages over the C5 and C7 capacitor. Need to play with the parameters a little bit more though.

Thanks for the help guys!

stoc005 · 9th November 2009, 07:09 PM

Yes, I've had it simulate with LTSpice. Be warned - there will be a DC offset on the speaker > 50mv and no way to adjust it. That app. note is somewhat incomplete.

5th November 2009, 07:51 PM	#1
AIS diyAudio Member Join Date: Oct 2009	Um10155 & pspice Has anyone got the UM10155 to run in Cadence PSPICE? I only get the "ERROR -- Convergence problem in transient bias point calculation" and I just can't get past it.

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5th November 2009, 08:07 PM	#2
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	You need to "use initial conditions" for your transient solution. You probably need to mess with this some, and set certain node voltages and device currents to nonzero values. On the other hand it may work with only "uic" set.

6th November 2009, 09:18 PM	#3
ttako diyAudio Member Join Date: Dec 2002 Location: Hungary/ Budapest	Did you use Load? I mean a 4 ohm resistor as a basic model of the speaker to load the amp? Sometimes it helps... BR, Tamas

6th November 2009, 10:18 PM	#4
AIS diyAudio Member Join Date: Oct 2009	Yes, I used a resistive load (however, interesting to see the UcD’s ability to drive capacitive and inductive loads). I got it to simulate with the SKIPBP checked (UiC), lowered the maximum step size, STEPGMIN checked and auto converged checked. I also needed to put initial voltages over the C5 and C7 capacitor. Need to play with the parameters a little bit more though. Thanks for the help guys!

9th November 2009, 07:09 PM	#5
stoc005 diyAudio Member Join Date: Feb 2007 Location: Midwest in the USA	Yes, I've had it simulate with LTSpice. Be warned - there will be a DC offset on the speaker > 50mv and no way to adjust it. That app. note is somewhat incomplete.

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