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Derating Analysis for component reliability in PSpice

DesignTech

Smoke Analysis in PSpice warns of component stress due to power dissipation, increase in junction temperature, secondary breakdowns, or violations of voltage / current limits. Over time, these stressed components could cause circuit failure.

Smoke uses Maximum Operating Conditions (MOCs), supplied by vendors and derating factors supplied by designers to calculate the Safe Operating Limits (SOLs) of a component’s parameters. It then compares circuit simulation results to the component’s safe operating limits. If the circuit simulation exceeds the safe operating limits, Smoke identifies the problem parameters.

You can use Smoke Analysis for Displaying Average, RMS, or Peak values from simulation results and comparing these values against corresponding safe operating limits.

You can use standard derating or a custom derating file for setting derating factors for different parameters of the components in your design.

Checkout the quick tutorial video here.

 

Team DesignTech

Cadence Design Systems

  • Schulz Jordan

    What is the typical derating value users can set for components. How can he gauge this should have 0.8, other should have 0.5 & others with different value. Is it all defined in the datasheet or somewhere else.

  • HIMS
    in reply to Schulz Jordan

    Hi, by default, you can apply either no derate or standard derate profile which comes with installation. This allows to put fixed derate values on all the components supported.

    In addition, you can create a custom derate profile which allows you to add specific components and set derate values for each parameter the component support for SMOKE analysis.

    Head over to this blog: (https://community.cadence.com/cadence_blogs_8/b/pcb/posts/smokeanalysis) and find the section: Adding derating to smoke analysis for more details.

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