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Class D Switching Power Amplifiers and Power D/A conversion

Um10155 & pspice
Um10155 & pspice
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Old 5th November 2009, 06:51 PM   #1
AIS is offline AIS
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Default 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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Old 5th November 2009, 07:07 PM   #2
sawreyrw is offline sawreyrw  United States
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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.
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Old 6th November 2009, 08:18 PM   #3
ttako is offline ttako
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Did you use Load?
I mean a 4 ohm resistor as a basic model of the speaker to load the amp?
Sometimes it helps...


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Old 6th November 2009, 09:18 PM   #4
AIS is offline AIS
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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!
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Old 9th November 2009, 06:09 PM   #5
stoc005 is offline stoc005  United States
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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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