WCCA Report Download
Simulating Stability and EMC/ESD
Transients for Automotive
Automotive Power Supply WCCA
Stability and EMC/ESD Transient (ISO7637, FMC1278,etc.)
analysis is a challenging endeavor. Most people severely underestimate
the effort required. First the circuit must be modeled properly. This is
a challenge because parts must be modeled AND toleranced. A nominal model
is not enough. And most vendor supplied models are deficient in some way.
They should be checked, correlated, and adjusted. Then you must run the
AC analysis to confirm the supply meets stability. After that comes the
pain. A series of EMC and ESD transients must be simulated, and parts
checked for stress during the analysis.
This sample report shows you what you are in for and
why you need AEi System’s help to perform this analysis correctly.
Automotive EMC/Stability Report
WCCA Example Report - Simulating Stability and EMC/ESD Transients for
Automotive Power Supplies - LM25116
Stability and EMC-ESD Transient Example
Worst Case Happens Every Day
Many don’t believe that
the tolerance stackup is possible. That parts or circuits can be as bad
as the stackup says they are. The total tolerance stackup includes
Initial, temperature, aging, manufacturing and in Space, radiation
tolerances. In some cases, these are largely beginning of life and in
some cases, more end-of-life. But the bottom line is worst case happens
Here’s this months
light-hearted look at how out of tolerance conditions can cascade and why
you need to perform WCCA.
Video Tutorial: Your Circuit Without WCCA
about Power Integrity
about SPICE Modeling
about Design of Sensitive Circuits
Designing Power for
NEW POST/WCCA BLOG SERIES – EDN
#3 - The importance of SPICE
part and circuit simulation models in WCCA
Circuit models are the
heart of worst-case circuit analysis (WCCA). For simulations to be valid,
you must gather and vet models or create them yourself; you can't usually
rely on the manufacturer's model. Your models must correlate to
datasheets or test data, and then you need to add tolerances to those
models. Your goal is to create an accurate model with the
"proper" fidelity. Too much fidelity results in high costs, but
models that are too simple or inaccurate can result in bogus
You Need Worst Case Analysis Support?
AEi Systems performs WCCA for Space, Automotive and other applications.
If you need electrical engineering services, please contact us at
Performing WCCA for the first time is not a trivial
exercise. It is simply not for first-timers.
- Running out time?
- Don’t have the
resources or experience to get the analysis completed on time?
- Don’t fully
understand the scope and what is expected?
- Don’t have the
models or confidence your internal resources can meet customer
If you are interested in learning how to perform WCCA,
the best way to do that is work with AEi Systems on your first WCCA. The
process will result in an analysis you can use as a guide for future
AEi Systems brings decades of
WCCA experience to bear on finding problems in your circuitry. We
highlight the worst case issues and provide the reporting auto
manufacturers are looking for. We help you fix the issues we find and our
WCCA passes muster with manufacturer review teams and industry standards.