A new tolerance design method for LED Lamp driver with performance degradation model

This paper proposes a new tolerance design method for electronic system with performance degradation model to improve the robustness of output characteristic. The sensitive parameters that lead to output fluctuation are determined by sensitivity analysis based on experiment design. Statistical testing is used to characterize the trend patterns for the mean and the variance of critical components, from which different types of degradation paths will be extrapolated. The degraded distribution models are established for the output according to the sensitive component characteristic. Through the limit specification, the optimal tolerances are allocated to the sensitive parameters to minimize quality loss. A practical implementation of the method is manifested through evaluating probabilities by Monte Carlo simulation.