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SmartPA Speaker Protection Algorithm

 

In the past several years, SmartPA has become more and more widely used in the personal electronics area, especially in smartphone, to make full use of the relatively smaller speaker and get better sound quality with maximum volume. SmartPA system consists of a) power amplifier with current and voltage sensing and b) SmartPA speaker protection algorithm which protects the speaker from excursion and temperature damage, The SmartPA algorithm is based on the mechanical and electrical characteristics of the speaker. This article will discuss about speaker modelling and protection based on the TI SmartPA algorithm.