Estimating Output Current Tolerance Of A Primary–Side-Regulated Constant-Current Flyback Converter (Part 3): Extreme Value Analysis And Sensitivity Analysis

by Stéphanie Cannenterre, ON Semiconductor, Toulouse, France, How2Power Today, Mar 21 2018

Focus:
In parts 1 and 2 of this article, the author derived an analytical model of the primary-side regulated (PSR) constant-current (CC) flyback and used this model to perform a Monte Carlo analysis (MCA) of the converter. In this third part, the author carries out an extreme value analysis (EVA) and a sensitivity analysis of the PSR flyback converter. For this study, only the initial tolerances of the parameters are considered (except for the controller parameters). The goal is to provide an interval for the output current value at the beginning of life of the converter. This article concludes by comparing the results of the EVA and sensitivity analysis with the MCA and determining whether we have met the goal for output current tolerance in the LED driver application.

What you’ll learn:

• How to estimate the output current accuracy of a PSR constant-current-output flyback converter using extreme value analysis (EVA) and a sensitivity analysis

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