Verifying Error Budget Analysis For A Buck Converter—On The Bench

by Benjamin Lampe, Maxim Integrated, San Jose, Calif., How2Power Today, Jun 17 2019

Focus:
A previous article looked at hand calculations for buck converter error budgeting and saw how they stacked up against simulations from EE-Sim, Maxim Integrated's online SIMPLIS power supply design and simulation tool. But how closely do the hand calculations and models match bench measurements? This article verifies the output voltage error budget analysis performed on the MAX17242 buck converter design by comparing simulation results with bench measurements on working hardware. The article begins by checking the accuracy of the MAX17242 SIMPLIS model in simulating the load step response against measured results. After observing the close correlation in results, the article then explains the steps taken to tweak the IC model to reflect the characteristics of the actual silicon being tested, while also discussing the capabilities and advantages of Maxim's EE-Sim OASIS design tool. It then demonstrates, through further simulation and measurement, how the confidence achieved in developing and testing the model, enables us to accurately simulate the performance of the converter with respect to the voltage droop. Finally, the article sweeps specific parameters to understand the range of potential transient responses across component and silicon variation.

What you’ll learn:

• How to evaluate the accuracy of the EE-Sim, Maxim’s power supply design and simulation tool in performing error budget analysis for a buck converter

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