LTSpice IV simulation speed adjustments

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SUMMARY

The discussion centers on optimizing simulation speed in LTSpice IV when simulating DC/DC switching power supplies. Users report a simulation speed of 25 microseconds per second, significantly slower than the 145 milliseconds per second observed in example circuits like "astable." The inability to find a dedicated "simulation speed" adjustment in LTSpice IV is highlighted, alongside the observation that circuit modifications, such as adding a 200uF capacitor, drastically affect simulation speed. This indicates that simulation speed in transient analysis is inherently dependent on circuit characteristics and cannot be universally adjusted.

PREREQUISITES
  • Familiarity with LTSpice IV simulation software
  • Understanding of DC/DC switching power supply circuits
  • Knowledge of transient analysis in circuit simulation
  • Basic concepts of circuit components and their impact on simulation
NEXT STEPS
  • Research techniques for optimizing LTSpice IV simulation settings
  • Learn about transient analysis and its effects on simulation speed
  • Explore circuit design strategies to improve simulation performance
  • Investigate the impact of different capacitor values on simulation speed in LTSpice IV
USEFUL FOR

Electrical engineers, circuit designers, and simulation specialists looking to enhance the performance of LTSpice IV for faster simulation of power supply circuits.

ElectroPhysics
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Hi everybody. how r u.
i'm using linear technology's LTSpice IV to simulate my dc/dc switching power supplies. for that I'm using the chips from the same company. the problem is that when i simulate the circuit using LTSpice IV the simulation speed that it shows is only 25microsecond/s which is too slow and i have to wait for a lot of time for the simulation to end. when i searched examples given in this software such as "astable" the simulation speed there is 145milisecond/s which is very good. i have tried my best to solve this issue i.e. by searching every menu given in the software but could not find "simulation speed" button/form. please tell me how to adjust the simulation speed for my circuits.
 
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another thing that i noted in "astable" example that if i change the circuit slightly i.e. for example connecting a 200uF capacitor to the monitored output, the simulation speed shoots from 145miliseconds/s to hundreds of second/s as when the curve become flat. Does it conclude that simulation speed in "transient analysis" is curve dependent and can not be adjusted by will?
 

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